Answer:
W = 0.15 J
Explanation:
Given that,
The force acting on the ball, F = 15 N
It makes contact with the ball for a distance of 0.01 m
We need to find the work done on the ball. The work done can be calculated as :
W = Fd
So,
W = (15 × 0.01) J
W = 0.15 J
So, the work done is 0.15 J.
Temperature and kinetic energy have a________
relationship.
an elevator provides 21 000 w of power during a 12 s ride. how much work does the elevator do?
Answer:
252000 J
Explanation:
W = Pt
W = (21000 w)(12 s)
W =252000 J
Which of the following is an uncontrollable risk factor for myocardial infarction?
weight gain
age
poor diet
cigarette smoking
Which region on the map has the highest risk of future landslides?
Answer:
Reigon 1
Explanation:
It has the higest rate of landslides currently
How much net force is acting on a 50 kg falling object that has reached terminal velocity?
0 N
50 N
100 N
500 N
Answer:
Net force would be zero
Explanation:
It's still receiving a gravitational force of almost 500 Newtons downward, but because it has reached terminal velocity, that means it's also receiving an opposite and roughly equal force due to friction with the air. The two balance out for a total of zero.
Answer:
0 N
Explanation:
UM CAN SOME GIVE ME THE ANSWER PLS IM LIKE DYING I RLLY NEED THE ANSWER ITS DUE IN 2 MIN
In addition to thermal conductivity, what other properties of materials would
need to be considered when designing and building houses? Give three
suggestions.
Answer:
Wood, metal, Stone
Explanation:
Answer:
Thermal resistance,Specific Heat Capacity,Density
Explanation:
How does a computer process data? *
A.Computer processes combinations of 1s (on) and Os (off) as a form a code and
translates it into data.
B.Computer processes combinations of base 10 numbers using different amounts of
voltage and translates it into data
C.Computer processes number of lights on to tally and translates it into data
D. All of the above
The correct answer D: all of the above
The diagram does not represent a real electric field because the field lines__
NEED ANSWERS NOW
Answer:
cross at many points
Explanation:
According to the diagram it does not shows the real electric field as the electric field does not intersect with each other but according to the given diagram many lines are intersected with each other
So the correct option is C as it would be crossed at many points
Hence, the same would be relevant
Motion is
displacement
an object you look at to determine if something is moving
a change of position in relation to another object
speed
Answer:
a change of position in relation to another object.
Explanation:
Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point.
This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.
A reference point refers to a location or physical object from which the motion (movement) of another physical object or body can be determined.
Mathematically, the motion of an object is described in terms of acceleration, time, distance, speed, velocity, displacement, position, etc.
Hence, motion is a change of position in relation to another object.
Can scientific laws be changed by a vote
Answer:
No, because a scientific law is always absolutely true, no matter what a vote could not change a scientific law. People can vote how fast the speed of light is per second, but light will always be the speed it is no matter what.
A gold bar contains 63.0 mol of gold, Au(s). How many atoms of gold are in the bar?
Answer:
63.0 x (6.02 x 10^23) = 3.79 x 10^25 atoms of gold
Explanation:
There are 6.02 x 10^23 representative particles in a mole of any substance. Multiply it by the number of moles, and you will get the number of representative particles (atoms, molecules, formula units)
the letter R in the world Warm reminds you that warm air does what
Why does it take 2 days longer for the Moon to go from New Moon to New Moon when viewed form the Earth than it takes for the the moon to make 1 complete rotation on its axis?
The time between two new Moon phases or two full Moon phases is 29.5 days. ... The difference of 29.5 and 27.3 is that while the Moon is orbiting the Earth, the Earth is moving along in its orbit so it takes longer for the Moon to reach the same position relative to the Sun.
A light beam with a 70° angle of incidence travels through a medium with an index of refraction of 1.8. The light enters a second medium and has an angle of refraction of 37°. What is the index of refraction of the second medium?
Answer:
Explanation:
For refraction , the formula is
sin i / sin r = μ₂ / μ₁
where light is travelling from medium 1 to 2 having refractive index of μ₁ and μ₂ . Angle of incidence in medium 1 is i and angle of refraction in medium 2 is r .
Here i = 70°, r = 37°
μ₁ = 1.8 ,μ₂ = ?
sin70 / sin 37 = μ₂ / 1.8
.939 / .602 = μ₂ / 1.8
1.56 = μ₂ / 1.8
μ₂ = 2.81 .
The value of refraction index for the second medium will be [tex]\mu_2=2.16[/tex]
What will be the refractive index?Every material has a different refractive index. The refracted index of any material shows that the light is refracted by how much angle.
So like for water its value will be different also for glass its value will be different.
Now it is given in the question that
Angle of incidence [tex]i=70^o[/tex]
Refractive index of the first medium [tex]\mu_1=1.8[/tex]
Angle of refraction [tex]r=37^o[/tex]
Now from snells law
[tex]\dfrac{Sin \ i}{Sin \ r} = \dfrac{\mu_2}{\mu_1}[/tex]
[tex]\dfrac{Sin70}{Sin37} = \dfrac{\mu_2}{1.8}[/tex]
[tex]\mu_2= \dfrac{Sin70\times1.8}{Sin37}[/tex]
[tex]\mu_2=2.16[/tex]
Thus the value of the refraction index for the second medium will be [tex]\mu_2=2.16[/tex]
To know more about the Refractive index follow
https://brainly.com/question/10729741
How much electricity is used to boil 600 g of water if the kettle has a power of 1500 W? The water boiled for 3 minutes and 9 seconds. Water density is 1000 kg/m3, specific heat of water is 4200 J/(kg· oC).
Answer:
The electrical energy consumed in boiling the water is 0.0788 kWh
Explanation:
Given;
mass of the water, m = 600 g = 0.6 kg
power rating of the kettle, P = 1500 W = 1.5 kW
specific heat capacity of water, c = 4,200 J/kg⁰C
density of water, = 1000 kg/m³
time taken to boil the water, t = 3 mins + 9 s = (3 x 60s) + 9 s = 180 s + 9 s = 189 s = [tex]189 \ s \times \frac{1 hr}{3.600 \ s} = 0.0525 \ hr[/tex]
The electrical energy consumed in boiling the water is calculated as;
E = P x t
E = 1.5 kW x 0.0525 hr
E = 0.0788 kWh
Therefore, the electrical energy consumed in boiling the water is 0.0788 kWh
An object is in front of a converging lens of f = 15 cm, what is the distance of the object if you know that the distance of the image is 20 cm ?
Answer:
ikn
Explanation:
Answer:
the distance is 15+20=35 cm
i truly need help with these 10 questions , it soo late and i only have 2 days too turn it in please anybody help me !!
Gravity always acts towards the center of the earth. TRUE OR FALSE?
Answer:
On Earth, gravity pulls all objects to Earth's center. The Law of Universal Gravitation states that all objects in the universe attract each other, therefore gravity acts on all objects in the universe. Although gravity affects all things, the attraction between two objects depends on a few things.
Explanation:
Answer:
T
Explanation:
The Earth is one massive object whose gravitational force is very strong. Thus gravity of Earth attracts all objects towards the centre of Earth.
A 1500 kg car accelerates at 3 m/s^2. What is the net force acting on the car?
Answer:
4500N
Explanation:
Force =mass into acceleration
So 1500 into 3 you will get 4500
When a warm air mass collides with a cold air mass, the warm air mass rises above the cold air mass leading too:
A) Sunny skies
B) Global warming
C) The formation of clouds and rain
D) Volcanic eruptions
Answer: It leads to a front. A front is.., I don't know how to explain it, so I'll add a picture. Fronts are made out of clouds and usually bring rain. So the answer is C: The formation of clouds and rain.
Explanation:
Motion is
displacement
an object you look at to determine if something is moving
a change of position in relation to another object
speed
Answer:
a change of position in relation to another object.
Explanation:
Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point.
This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.
A reference point refers to a location or physical object from which the motion (movement) of another physical object or body can be determined.
Mathematically, the motion of an object is described in terms of acceleration, time, distance, speed, velocity, displacement, position, etc.
Hence, motion is a change of position in relation to another object.
A 8.73-g bullet is moving horizontally with a velocity of 345 m/s, where the sign indicates that it is moving to the right (see part a of the drawing). The bullet is approaching two blocks resting on a horizontal frictionless surface. Air resistance is negligible. The bullet passes completely through the first block (an inelastic collision) and embeds itself in the second one, as indicated in part b. Note that both blocks are moving after the collision with the bullet. The mass of the first block is 1201 g, and its velocity is 0.714 m/s after the bullet passes through it. The mass of the second block is 1606 g. (a) What is the velocity of the second block after the bullet imbeds itself
Answer:
v₃ = 1.334 m/s
Explanation:
This problem can be solved using the law of conservation of momentum:
[tex]m_{1}u_{1} + m_{2}u_{2} + m_{3}u_{3} = m_{1}v_{1} + m_{2}v_{2} + m_{3}v_{3}\\[/tex]
m₁ = mass of bullet = 8.73 g = 0.00873 kg
m₂ = mass of first block = 1201 g = 1.201 kg
m₃ = mass of second block = 1606 g = 1.606 kg
u₁ = initial speed of bullet = 345 m/s
u₂ = initial speed of first block = 0 m/s
u₃ = initial speed of second block = 0 m/s
v₁ = final speed of bullet = v₃ (since the bullet is embedded in second block)
v₂ = final speed of first block = 0.714 m/s
v₃ = final speed of second block = ?
Therefore,
[tex](0.00873\ kg)(345\ m/s)+(1.201\ kg)(0\ m/s)+(1.606\ kg)(0\ m/s)=(0.00873\ kg)(v_{3})+(1.201\ kg)(0.714\ m/s)+(1.606\ kg)(v_{3})[/tex]
[tex]3.0118\ kg.m/s - 0.8575\ kg.m/s = (1.6147\ kg)(v_{3})\\\\v_{3} = \frac{2.1543\ kg.m/s}{1.6147\ kg} \\[/tex]
v₃ = 1.334 m/s
A student asks the question: "How does an object's mass affect its motion?"
Which of the following is a testable hypothesis for this question
Answer:
The options are not given, so i will answer in a really general case.
There are two equations that describe how mass affects the motion of an object.
The most generical one, Newton's second equation of motion.
This says that:
F = m*a
Force equals mass times acceleration.
Remember that acceleration tells us how the motion of an object changes as time passes.
So if we isolate the acceleration we get:
a = F/m
Here you can see that the mass is in the denominator, so, for a fixed force F, if we increase the mass of the object, the acceleration will decrease, which means that as more mass has an object, "harder" is to accelerate it.
Now from an energy point of view.
The kinetic energy (the motion energy of a moving object) is written as:
T = (1/2)*m*(v^2)
where:
m = mass
v = velocity.
Here, for a fixed velocity v, if we increase the mass, we also increase the kinetic energy.
This means that if we have two objects, one with a small mass m, and the other with a larger mass M, and we want to give both objects the same velocity v, we will need more energy for the object with more mass.
So in general we can conclude that mass "opposes" to the motion.
Now, we also can define the term "testable"
A hypothesis is testable if we can think of an experiment to test it, if there is no experiment, then the hypothesis is not testable.
what is the average speed of an athlete who runs 1500m in 4minuites
Answer:
375m per minute
Explanation:
Just divide 1,500 by 4 and you will get your answer!
Answer:
375 meters per minute
Explanation:
it is that much
2. A ball is dropped from rest. The acceleration due to gravity is 10m/s? and the time it
takes for the ball to reach the ground is 5 seconds. What was the velocity of the ball just
before it hits the ground
Answer:
STEP BY STEP
V = S/T
V= 10/5
V = 2 m/s
Please help?? PWEASE PWEASE PWEASE
Describe how you would draw a diagram that shows the electric field between two particles that attract each other.
Answer:
draw the two atomic structures and then focus in on the electrons either gaining or losing and draw them with arrows and dots
Explanation:
name one property you know about LIGHT. Explain.
Answer:
The primary properties of visible light are intensity, propagation-direction, frequency or wavelength spectrum and polarization, while its speed in a vacuum, 299 792 458 m/s, is one of the fundamental constants of nature.
Explanation:
Light is made of particles called photons, bundles of the electromagnetic field that carry a specific amount of energy. With sufficiently sensitive experiments, you can count photons or even perform measurements on a single one. Researchers have even frozen light temporarily.
Hope this Helps :)
What are the energy transformations that occur during a roller coaster ride? 1 paragraph
Answer:
The movement of a roller coaster is accomplished by the conversion of potential energy to kinetic energy. The roller coaster cars gain potential energy as they are pulled to the top of the first hill. As the cars descend the potential energy is converted to kinetic energy. Roller coasters rely on gravity to take them to the end of the track. This involves two types of energy, potential energy and kinetic energy.
Explanation: my mom told me lol ..
Answer:
The movement of a roller coaster is accomplished by the conversion of potential energy to kinetic energy. The roller coaster cars gain potential energy as they are pulled to the top of the first hill. As the cars descend the potential energy is converted to kinetic energy.
Explanation:
That's gonna help right?
What is the electric resistance of a copper wire 0.65 m long with a diameter of 2 mm?
To calculate resistance, we will use the formula:
R = ρl / A
where ρ(rho) is the resistivity of the material, l is the length of the wire and A is the cross-sectional area
We are given:
Length of wire (l) = 0.65 m
Diameter of wire (d) = 2 mm
Material of wire: Copper
Some important conversions:
- radius of the wire = diameter/2
radius = 2 mm/2 = 1 mm OR 1 * 10⁻³m
Calculating the cross-sectional area:
Cross-sectional area is the area of the circle at the end of the wire.
Cross-sectional area = π(r²)
Area = π(1 * 10⁻³)² [replacing the value of r]
Area = π * 10⁻⁶ m²
Calculating the resistance:
using the formula mentioned before:
R = ρl / A
R = [tex](1.7 * 10^{-8}ohm*m ) * \frac{0.65 m}{3.14 * 10^{-6}m^{2}}[/tex] [resistivity of copper = 1.7 × 10⁻⁸ Ωm]
R = 3.52 * 10⁻³ (approx)
Answer:
3.5 × 10⁻³ Ω
Explanation:
The resistance of a conductor is calculated by the formula:
[tex]\displaystyle R=\rho \cdot \frac{l}{A}[/tex] where R = electric resistance (Ω), ρ = resistivity (Ω · m), l = length of the wire (m), A = area of the cross-section of the wire (m²)Let's start by converting the diameter of the copper wire to meters.
2 mm → .002 mSince we want the radius of the cross-section, we will divide .002 m by 2.
.002/2 = .001 mThe radius of the copper wire is .001 m. We can calculate the area of the circular cross-section by using the formula:
[tex]A=\pi r^2[/tex] [tex]A= \pi (.001)^2[/tex] [tex]A= \pi \cdot 10^-^6[/tex]The area of the cross-section is π · 10⁻⁶ m².
The length of the wire is 0.65 m long. We do not have to convert units for the length of the wire since it is already in the SI units: meters.
Assuming the copper wire is at 20°C, we know that its resistivity is 1.7 · 10⁻⁸ Ω · m.
Using these three variables, we can solve for R in the formula for electric resistance.
ρ = 1.7 · 10⁻⁸ Ω · m l = 0.65 m A = π · 10⁻⁶ m²Substitute these values into the equation.
[tex]\displaystyle R=\rho \cdot \frac{l}{A}[/tex] [tex]\displaystyle R=(1.7 \cdot 10^-^8\ \Omega \cdot \text{m}) \cdot \frac{0.65 \ \text{m}}{(\pi \cdot 10^-^6 \ \text{m}^2 )}[/tex] [tex]\displaystyle R=\frac{(1.105 \cdot 10^-^8 \ \Omega \cdot \text{m}^2)}{(\pi \cdot 10^-^6 \ \text{m}^2)}[/tex] [tex]R=.3517324242 \cdot 10^-^2 \ \Omega[/tex] [tex]R=.003517324242 \ \Omega[/tex]Notice how the unit m² cancels out, leaving us with Ω (units of electrical resistance).
The electric resistance of a copper wire 0.65 m long with a radius of .001 m is .0035 ohms (Ω), or 3.5 × 10⁻³ Ω.
If a 5 kg cart is pulled with a net force of 20 Newtons. What is the magnitude, in m/s2, of the acceleration?
Answer:
F=ma
a=F/m=20/5=4 m/s^2