Answer:
What happens is that light slows down when it passes from the less dense air into the denser glass or water. This slowing down of the ray of light also causes the ray of light to change direction.
Explanation:
(a) If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 3.0 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g 5 9.80 m/s2 ? (b) Repeat for Mars, where the acceleration due to gravity is 0.38g.
Answer:
See explanation
Explanation:
Range of a projectile is given by; U^2sin2θ/g
When θ = 45°
The maximum range is obtained as;
Rmax = U^2/g
Maximum range on earth = RME = U^2/g
Maximum range in the moon= RMM =U^2/g/6
Maximum range in Mars = RMMA = U^2/0.38g
a)
RME/RMM = U^2/g/U^2/g/6
RME/RMM = 6
But RME = 3 m
RMM = 3 * 6 = 18 m
b)
RME/RMMA =U^2/g/U^2/0.38g
RME/RMMA = 1/0.38
But RME = 3 m
RMMA = 3/0.38
RMMA = 7.9 m
What are isotopes.
Please answer soon
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
A guitar player tunes the fundamental frequency of a guitar string to 560 Hz. (a) What will be the fundamental frequency if she then increases the tension in the string by 15%? (b) What will it be if, instead, she decreases the length along which the string oscillates by sliding her finger from the tuning key one-third of the way down the string toward the bridge at the lower end?
Answer:
(a) if she increases the tension in the string is increased by 15%, the fundamental frequency will be increased to 740.6 Hz
(b) If she decrease the length of the the string by one-third the fundamental frequency will be increased to 840 Hz
Explanation:
(a) The fundamental, f₁, frequency is given as follows;
[tex]f_1 = \dfrac{\sqrt{\dfrac{T}{\mu}} }{2 \cdot L}[/tex]
Where;
T = The tension in the string
μ = The linear density of the string
L = The length of the string
f₁ = The fundamental frequency = 560 Hz
If the tension in the string is increased by 15%, we will have;
[tex]f_{(1 \, new)} = \dfrac{\sqrt{\dfrac{T\times 1.15}{\mu}} }{2 \cdot L} = 1.3225 \times \dfrac{\sqrt{\dfrac{T}{\mu}} }{2 \cdot L} = 1.3225 \times f_1[/tex]
[tex]f_{(1 \, new)} = 1.3225 \times f_1 = (1 + 0.3225) \times f_1[/tex]
[tex]f_{(1 \, new)} = 1.3225 \times f_1 =\dfrac{132.25}{100} \times 560 \ Hz = 740.6 \ Hz[/tex]
Therefore, if the tension in the string is increased by 15%, the fundamental frequency will be increased by a fraction of 0.3225 or 32.25% to 740.6 Hz
(b) When the string length is decreased by one-third, we have;
The new length of the string, [tex]L_{new}[/tex] = 2/3·L
The value of the fundamental frequency will then be given as follows;
[tex]f_{(1 \, new)} = \dfrac{\sqrt{\dfrac{T}{\mu}} }{2 \times \dfrac{2 \times L}{3} } =\dfrac{3}{2} \times \dfrac{\sqrt{\dfrac{T}{\mu}} }{2 \cdot L} = \dfrac{3}{2} \times 560 \ Hz = 840 \ Hz[/tex]
When the string length is reduced by one-third, the fundamental frequency increases to one-half or 50% to 840 Hz.
Matthew throws a ball straight up into the air. It rises for a period of time and then begins to drop. At which points in the ball’s journey will gravity be the greatest force acting on the ball?
Answer:
When the ball falls down.
A rocket is fired at 60 to the horizontal with an initial speed of 200m5 calculate it time of flight and it range on the horizontal plane
Answer:
See answer below
Explanation:
In order to do this, we just need to apply the expression to determine the time of flight. This is given by:
t = 2 V₀ Sinθ / g (1)
We have the initial speed which is 200 m/s, the angle of elevation to the horizontalis 60° and the gravity is 9.8 m/s². Replacing this data in the above expression we have:
t = 2 * 200 Sin60° / 9.8
t = 35.348 sNow that we have the time, we can determine the range or distance in the horizontal plane. This can be calculated using the following expression:
X = V * t (2)
We already have the time, which is the time of flight, the initial speed using cos 60° (Cause it's horizontal plane), and replacing we have:
X = 200 cos60° * 35.348
X = 100 * 35.348
X = 3534.8 mHope this helps
During heavy exercise, muscle cells use oxygen more quickly than normal. Which system responds by carrying extra oxygen to these muscle cells?
a. digestive b. circulatory c. nervous
d. immune
Answer:
The answer is B. Circulatory
An instrument that simply measures earth waves is a _______
Answer:
Seismograph
Explanation:
Seismograph, instrument that makes a record of seismic waves caused by an earthquake, explosion, or other Earth-shaking phenomenon.
Which two options describe physical properties of matter?
A. Whether a substance floats or sinks in water
B. Whether a substance tarnishes
C. The ability of a substance to combine with other substances
D. The temperature at which a substance boils
E. Whether a substance can be burned
Answer:
A. (Buoyancy) and D. (Temperature)
Explanation:
I took itttttttttttttttt
The physical properties of matter are A and D.
What are the properties of matter?
Those who have mass and occupy space are called matter.those are residences together with mass, weight, quantity, and density. Density calculations can be mentioned in a while in chapter 3, however for now just remember the fact that density is a physical property. physical houses that do not depend on the amount of substance present are called extensive residences.
Among the following the properties of matter are:-
A. Whether a substance floats or sinks in water.
D. The temperature at which a substance boils.
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You are so excited that you have finished this test that you give your friend a huge high five with 20N of force.
With how much force does your friend's hand high five you back?
Answer:
20N
Explanation:
newtons 3rd law every action has an equal opposite reaction
I'm not too sure
A bullet of mass 0.05kg has a speed 400.what is it's kinetic energy.
if the bullet hits a wall of which the average resistive force is 10000 newton.calculate the distance penetrated by the bullet.
Answer:
K.E =1÷2M×V^2
= 1÷2×0.05×(400)^2
= 4000
Explanation:
EXERCISE 1
An object and an image are displayed on either side of a lens. Copy the figure to your sheet.
A) Calculate the focal length using the lenses formula.
B) Determine where the focal length should be, using the light construction beams.
C) Draw the light beam that illuminates the entire lens from point B. Draw how it continues after the lens.
D) Measure the focal length, object distance and image distance and write it down as shown in the figure under the graph paper.
what is the y axis on a graph?
The simple act of walking requires single leg
full body
and
a strong
and
full body
you are so wise how do you do it?
Draw a lift pump diagram and explain how it operates.
Solve the following problems
A metal box of weigh 20 N rests on its 1 m by 0.6m side on floor. How
much is the pressure exerted by the metal box on the floor? Take ga
10 m/s?
A rectangular container of base 50 cm by 30 cm is filled with water to a
depth of 5 cm. How much is the pressure exerted at the base?
(Take pw= 1000 kg/m3 and g =10 m/s2)
How much is the pressure exerted at a point where a ball- pointed
pen of area 1mm? is pushed against the paper with a force of 24 N?
Suppose a scientist was able to construct a barometer with a liquid
being twice denser than mercury, then how high would the liquid raise
ard pressure?
m. if the
oil to a
Answer:
1) The pressure exerted by the metal box on the floor is 33.[tex]\overline 3[/tex] Pa
2) The pressure exerted at the base is 250 Pa
3) The pressure exerted at the point where the pen pushes against the paper is 24 MPa
Explanation:
1) Pressure is given by the following relation
[tex]Pressure, P = \dfrac{Force, F}{Area, A}[/tex]
[tex]\therefore P = \dfrac{F}{A}[/tex]
The force exerted by the weight of the metal box, F = 20 N
The dimensions of the side on which the metal box rests = 1 m by 0.6 m
∴ The area of the side on which the metal box rests, A = 1 m × 0.6 m = 0.6 m²
The pressure exerted by the metal box on the floor, 'P' is therefore given as follows;
[tex]\therefore P = \dfrac{F}{A} = \dfrac{20 \, N}{0.6 \, m^2} = \dfrac{100}{3} \ Pa = 33.\overline 3 \ Pa[/tex]
The pressure exerted by the metal box on the floor, P = 33.[tex]\overline 3[/tex] Pa
2) The dimensions of the rectangular container are;
Base dimension = 50 cm by 30 cm = 0.5 m by 0.3 m
The depth to which the water is filled in the container = 5 cm = 0.05 m
The density of water, [tex]\rho_w[/tex] = 1,000 kg/m³
The volume of water in the container, V = Base area × Height = 0.5 m × 0.3 m × 0.05 m = 0.0075 m³
∴ V = 0.0075 m³
The mass of the water, m = V × [tex]\rho_w[/tex] = 0.0075 m³ × 1,000 kg/m³ = 7.5 kg
m = 7.5 kg
The weight of the water, W = m × g = 7.5 kg × 10 m/s² = 75 N
The base area, A = 0.5 m × 0.6 m = 0.3 m²
The pressure exerted at the base, P = W/A = 75 N/(0.3 m²) = 250 Pa
The pressure exerted at the base, P = 250 Pa
3) The area of the point of the ball-pointed pen pushing against the paper, A = 1 mm² = 0.000001 m²
The force with which the point on the pen pushes against the paper = 24 N
The pressure exerted at the point where the pen pushes against the paper, P = W/A
∴ P = 24 N/(0.000001 m²) = 24,000,000 Pa
The pressure exerted at the point where the pen pushes against the paper, P = 24,000,000 Pa = 24 MPa.
PLS HELP! I WILL GIVE BRAINLIEST TO BEST/ CORRECET ANSWER! 15 POINTS PER PERSON! PLS HELP!
Logan lists the causes of floods in Florida.
Which cause does not belong in the list?
A. big storms
B. inadequate drainage system
C. mild storms
D. rip currents
BTW: The fact that I selected an answer in the picture does not matter. Thank you!
Answer:
c might be right
Explanation:
c doesn't make any sense. big storms mean more water for flooding, inadequate drainage system means the water can't leave certain areas, I'm not sure what rip currents are tho
Answer:
rip currents
I live in florida, and we don't have mild storms either its big one or none :)
Explanation:
and can you help me please, its 30 points
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^^ there the same question but the first website i misspelt it but its 30 points and the 2nd website is the question written out right but its 5 point but there the same thing you need to do, you can put the same thing for both and get extra point idc, i just need help lease
PLEASE HELP
A 0.200 plastic ball moves with a velocity of 0.30 m/s . It collides with a second plastic ball of mass 0.1200 K B , which is moving along the same line at a speed of 0.10 m/s * A * f * t * e * r the collision , both balls continue in the same direction and the speed of the 0.1200 K B ball is 0.26 m/s . What is velocity of the first ball after the collision?
Answer:
29 m/s.
Explanation:
Hope this helps.
How does sound travel? *
Air molecules move in a straight line in one direction.
Air molecules move in waves that sometimes bounce back.
Air molecules move in waves in one direction.
None of the above.
Answer: 2 i think
Explanation:
Answer:Im pretty sure its the second one because sound sometimes bounces back and that causes echo and it doesnt travel in one line or direction
Explanation:
Two objects of mass 5 kg and 8 kg at rest F1 and F2 meters force applied on both the boxes respectively If the speed of both the objects after 5 sec become 16m/s and 15m/s respectively find the value of F1 and F2?
Answer:
F1 = 16 N and F2 = 24 N
Explanation:
Formula used => F = m×a and v-u= at
So, as we know force = mass × acc.
so acc. of first block = <math> F1/5 </math>. and acc. of second block = <math> F2/ 8 </math>.......... so as v-u= at.. now
Here u= 0 as the objects are placed at rest initially..
thus, v= at
FOR 1ST BLOCK
16= <math> F1/5 </math> × 5 ==> F1 = 16 N
FOR 2ND BLOCK
15= <math> F2/ 8 </math> × 5 ==> F2= 24 N
A 100-meter sprint is a race using only the straight side
of a racetrack. A 400-meter sprint is a race that makes
one complete lap around a racetrack. Why are velocity
and speed the same for a 100-m sprint but not a 400-m
sprint?
Answer: : it is so because velocity and speed differ each other by direction. in a 100 m sprint race ,the person moves in a straight path without changing its direction where as in a 400 m race , the person moves in a lap around the race track and the direction changes as he turns according to the race track.
Explanation:
Un cilindro contiene 10 L de oxígeno y otro contiene 10 L de dióxido de carbono, ambos se encuentran a 25 °C. De acuerdo con el modelo cinético de partículas, se puede afirmar que...
Answer:
Ver explicacion
Explanation:
Según el modelo cinético, las moléculas de gas están en constante movimiento.
La energía cinética promedio de las moléculas del gas depende de la temperatura del gas y de la masa molar del gas.
Si los dos gases ocupan el mismo volumen a la misma temperatura, la energía cinética promedio ahora depende de la masa molar de los gases individuales. Cuanto menor sea la masa molar del gas, mayor será la velocidad media de las moléculas del gas.
El oxígeno gaseoso tiene una masa molar menor que el dióxido de carbono. Por lo tanto, el oxígeno tiene una velocidad molecular promedio mayor que el dióxido de carbono.
what causes lightning?
Answer:
cause by imbalances between stroms cloud and grounds , or within the cloud themselves.
Explanation:
Lightning is an electrical discharge caused by imbalances between storm clouds and the ground, or within the clouds themselves. Most lightning occurs within the clouds. ... This heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash.
The positive and negative charges grow large enough, a giant spark lightning, occurs between the two charges within the cloud.
What is lightning?The naturally occurring electrostatic discharge with high voltage for short duration from the cloud to the ground or within the cloud. The lightning can be seen by a flash of light that could be followed by the strong sound. Lightning happens when the negative charges (electrons) in the bottom of the cloud are attracted to the positive charges (protons) in the ground or within the clouds. In the starting stages air acts as an insulator, but after the charges build up with the charges in the ground and cloud there will be the rapid form of electricity causes lightning. These lightning were in the color of bluish white.
Thus, the charges discharging naturally causes lightning.
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A jet plane flying 600 m/s experiences an acceleration of 4g when pulling out of the dive. What is the radius of curvature of the loop in which the plane is flying?
Answer:
The radius of the curve is 9,183.67 m.
Explanation:
Given;
velocity of the jet plane, v = 600 m/s
acceleration of the jet plane, a = 4g = 4 x 9.8 m/s² = 39.2 m/s²
The radius of the curve is calculated from centripetal acceleration formula as given below;
[tex]a = \frac{v^2}{r} \\\\r = \frac{v^2}{a} \\\\r = \frac{600^2}{39.2} \\\\r = 9,183.67 \ m[/tex]
Therefore, the radius of the curve is 9,183.67 m.
Can someone explain to me what omega(ω) represents and what theta(θ) represents when it comes to angular motion?
Answer:
the twenty-fourth, and last, letter of the Greek alphabet (Ω, ω), transliterated as ‘o’ or ‘ō.’.
Explanation:
[They are both the same passage]
What was Deborah Ashcraft’s motivation for organizing the Canstruction project in 1992? Use at least 2 details from the article to support your answer.
Answer:
jejeje
Explanation:
jejejejejee
Which statement describes the relationship between bond strength and the melting and boiling points of a substance?
A. As the force between the particles increases, the melting point increases and the boiling point decreases
B. As the force between the particles increases, the melting point decreases and the boiling point increases
C. As the force between the particles increases, the melting and boiling points decrease.
D. As the force between the particles increases, the melting and boiling points also increase.
Answer:
D
Explanation:
The relationship between bond strength and the melting and boiling points can be explained as the force between the particles increases, and the melting and boiling points also increase.Therefore the correct option is D.
What is the boiling point?It is a temperature at which the pressure exerted by the external atmosphere is equal to the vapor pressure of the substance.
The boiling point depends on atmospheric pressure, temperature, bond strength, and vapor pressure of the liquid.
The bond strength between different atoms of the substance greatly influences the boiling point and melting point.
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HELPPP ILL GIVE YOU BRAINLIST
which example below best illustrates electrical energy being converted into radiant energy?
A ) Fusing hydrogen nuclei in the sun
B ) Igniting fireworks
C ) lighting an Bunsen burner with a flint striker
D ) Turing on a light bulb
Answer:
Turning on a light bulb.
How long a workout session last is called?
Explanation:
Assuming the strength training sessions last roughly 20 minutes each, that breaks down to about three hours of exercise a week. According to these recommendations, beginner exercisers should work up to three to four 40-minute gym sessions per week.
The American Heart Association recommends 75 to 150 minutes of aerobic activity, and two strength training sessions per week. Assuming that strength training sessions last approximately 20 minutes each, that totals about three hours of exercise per week.
3.
Where is the weight of an object more on earth, Equator or poles? Why?
Answer:
The weight of an object at the poles is more than the weight of the object at the equator
Explanation:
The shape of the Earth is an ellipsoid such that the distance from the North and South poles to the Earth's center, R₁, is less than the distance from the Equator to the center of the Earth, R₂
The weight of an object is given by the universal gravitational law as follows;
[tex]Weight = F_{gravity} =G\times \dfrac{M \cdot m}{R^{2}}[/tex]
Where;
[tex]F_{gravity}[/tex] = The force of gravity = The weight of an object
G = The universal gravitational constant
M = The mass of the Earth
m = The mass of the object
R = The radius of the Earth
Where R₁ < R₂, we have;
The weight at the Poles, W₁ = [tex]G\times \dfrac{M \cdot m}{R_1^{2}}[/tex]
The weight at the Equator, W₂ = [tex]G\times \dfrac{M \cdot m}{R_2^{2}}[/tex]
We have;
[tex]\left(G\times \dfrac{M \cdot m}{R_1^{2}} \right) > \left(G\times \dfrac{M \cdot m}{R_2^{2}} \right) \because R_1 < R_2[/tex]
Therefore, the weight of an object at the poles, W₁, is more than the weight of the object at the equator, W₂
how does the angle of incidence compare with the angle of reflection?
Answer:
The angle of incidence is the angle between this normal and the incident ray; the angle of reflection is the angle between this normal and the reflected ray. According to the law of reflection, the angle of incidence equals the angle of reflection.
Explanation:
:)
Answer:
hope my answer helps
Explanation:
second law of reflection states that the angle of incidence equals to the angle of reflection,
this is the basic relationship,
so the angle of incidence is also equals to angle of reflection
hope this helps, if not please report it so that someone else gets to try it out
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An airplane traveling at 201 m/s makes a turn. What is the smallest radius of the circular path (in km) that the pilot can make and keep the centripetal acceleration under 5.0 m/s2 ?
Answer:
the smallest radius of the circular path is 8.1 km
Explanation:
The computation of the smallest radius of the circular path is given below:
Given that
V = Velocity = 201 m/s
a_c = acceleration = 5 m/s^2
radius = ?
As we know that
a_c = V^2 ÷ r
5 = 201^2 ÷ r
r = 201^2 ÷ 5
= 8,080.2 g
= 8.1 km
Hence, the smallest radius of the circular path is 8.1 km