the correct answer would be "B"
A BODY IS FALLING FROM THE HEIGHT OF 80M (G=10M/S²) FIND
T=?
V=?
Answer:
If you remember, as I have, the formulas for constant acceleration you'll never have to ask this question ever again.
For accelerstion ‘a'
Velocity ‘v’ at time ‘t' … v = a* t
Distance traveled x = 1/2 a * t^2
.
Explanation:
A sports car moving at constant speed travels 164 m in 13.77 s. If it then brakes and comes to a stop in 3.6 s. What is its acceleration in terms of "g's", where 1.00 g = 9.80 m/s2?
Answer:
a = - 0.3376 g's
Explanation:
The sports car has a constant speed when travelling. Covered 164 m in 13.77 s. Thus, speed = 164/13.77 m/s
It brakes and now comes to a stop in 3.6 s.
Thus final velocity = 0 m/s
Formula for acceleration is;
a = (v - u)/t
a = (0 - (164/13.77))/3.6
a = -3.308 m/s²
In terms of g's", where 1.00 g = 9.80 m/s², we have;
a = -3.308/9.8 g's
a = - 0.3376 g's
Scott travels north 3 Km and then goes west 3 Km before coming straight
back south 3 km. What is his displacement? *
9 Km
3 km, W
3 Km, E
9 km, S
Answer:
you have to times them all ti get the answer
Determine the diameter of wire with a circular cross-section that has tensile force of 60.0Newtons, and this force produces a stress of 3 060 000 pascal
Answer:
the diameter of the wire is 5 mm.
Explanation:
Given;
tensile force of the wire, F = 60 N
stress on the wire, δ = 3,060,000 Pa = 3,060,000 N/m²
Let A be the cross sectional area of the wire
The cross sectional area of the wire is calculated as follows;
[tex]\sigma = \frac{F}{A} \\\\A = \frac{F}{\sigma} \\\\A = \frac{60}{3,060,000} = 1.961 \times 10^{-5} \ m^2[/tex]
The diameter of the wire is calculated as follows;
[tex]A = \frac{\pi d^2}{4} \\\\d = \sqrt{\frac{4A}{\pi} } \\\\d = \sqrt{\frac{4\times 1.961 \times 10^{-5}}{\pi} } \\\\d = 5.0 \times 10^{-3} \ m\\\\d = 5 \ mm[/tex]
Therefore, the diameter of the wire is 5 mm.
A 1210 kg rollercoaster car is
moving 7.33 m/s. As it
approaches the station, brakes
slow it down to 1.88 m/s over a
distance of 5.29 m. How much
work did the brakes do?
Answer:30,400 j
Explanation:
i need this literally asap
which of these statements are true?
1. it is always correct to use a 3 Amp fuse.
2. Fuses come in several different sizes and values
3. A fuse can be re-set and used again
4. A fuse once ‘blown’ needs replacing
5. Fuses are the ‘weak point’ in a circuit
Answer:
I only know number 4 is correct
Explanation:
A group of particles of total mass 36 kg has a total kinetic energy of 398 J. The kinetic energy relative to the center of mass is 80 J. What is the speed of the center of mass
Answer:
4.203 m/s
Explanation:
First, we solve for the translational kinetic energy ( [tex]K_{\text {trans }}[/tex] ) in the definition of the total kinetic energy [tex]\left(K_{\text {tot }}\right)[/tex]. We also have an equation for the definition of [tex]K_{\text {trans }}[/tex] (third line). From these two equations we can solve for the speed of the center of mass [tex]\left(v_{\mathrm{CM}}\right)[/tex]
[tex]\begin{aligned}
K_{\text {tot }} &=K_{\text {trans }}+K_{\text {rot }} \\
\Longrightarrow K_{\text {trans }} &=K_{\text {tot }}-K_{\text {rot }} \\
K_{\text {trans }} &=\frac{1}{2} m_{\text {tot }} v_{\mathrm{CM}}^{2} \\
\Rightarrow \frac{1}{2} m_{\text {tot }} v_{\mathrm{CM}}^{2} &=K_{\text {tot }}-K_{\text {rot }} \\
\Rightarrow v_{\mathrm{CM}} &=\sqrt{\frac{2\left(K_{\text {tot }}-K_{\text {rot }}\right)}{m_{\text {tot }}}} \\
&=\sqrt{\frac{2(398 \mathrm{~J}-80 \mathrm{~J})}{36 \mathrm{~kg}}}=4.203 \frac{\mathrm{m}}{\mathrm{s}}
\end{aligned}[/tex]
why should we avoid putting a battery in a pocket containing keys?
Answer:
There are several possibilities why a battery can feel hot or heat up. In case of an external short circuit: this can happen when the battery is short circuited i.e. in a purse, or in a drawer. ... Then there is also the possibility of a short circuit, forced charging and heating up the battery.
Peron Company uses a perpetual inventory system and the net method of recording invoices. The company purchased merchandise on November 4 at a $2,000 invoice price with terms of 2/10, n/30.
Answer: See explanation
Explanation:
From the information given in the question, the journal entry is written below:
Debit: Merchandise inventory 1960
Credit: Account payable 1960
(To record purchase)
Note that 1960 was gotten as:
= 2000 × 98%
= 2000 × 0.98
= 1960
Note that 2% discount was given.
Particle A and particle B are held together with a compressed spring between them. When they are released, the spring pushes them apart, and they then fly off in opposite directions, free of the spring. The mass of A is 8.00 times the mass of B, and the energy stored in the spring was 73 J. Assume that the spring has negligible mass and that all its stored energy is transferred to the particles. (a) Once that transfer is complete, what is the kinetic energy of particle A
Answer:
K_a = 8,111 J
Explanation:
This is a collision exercise, let's define the system as formed by the two particles A and B, in this way the forces during the collision are internal and the moment is conserved
initial instant. Just before dropping the particles
p₀ = 0
final moment
p_f = m_a v_a + m_b v_b
p₀ = p_f
0 = m_a v_a + m_b v_b
tells us that
m_a = 8 m_b
0 = 8 m_b v_a + m_b v_b
v_b = - 8 v_a (1)
indicate that the transfer is complete, therefore the kinematic energy is conserved
starting point
Em₀ = K₀ = 73 J
final point. After separating the body
Em_f = K_f = ½ m_a v_a² + ½ m_b v_b²
K₀ = K_f
73 = ½ m_a (v_a² + v_b² / 8)
we substitute equation 1
73 = ½ m_a (v_a² + 8² v_a² / 8)
73 = ½ m_a (9 v_a²)
73/9 = ½ m_a (v_a²) = K_a
K_a = 8,111 J
What is a fuel?
something that you rub to make heat
something that can be burned to produce heat
a kind of electricity
anything that makes heat
plssssss answer correctly
Answer:
something that can be burned to produce heat
Explanation:
Combustion can be defined as an exothermic chemical reaction between physical substances, usually in the presence of oxygen and hydrocarbons to produce heat, light and carbon.
A fuel can be defined as something that can be burned to produce heat.
In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.
write down an example scenario of an object that has acceleration
Answer:
An object which experiences either a change in the magnitude or the direction of the velocity vector can be said to be accelerating. This explains why an object moving in a circle at constant speed can be said to accelerate - the direction of the velocity changes.
if a car turns a corner at constant speed, it is accelerating because its direction is changing. The quicker you turn, the greater the acceleration. So there is an acceleration when velocity changes either in magnitude (an increase or decrease in speed) or in direction, or both.
Explanation:
In Spanish, count to 1000 in hundreds. (100, 200, 300, 400…1000) You will be graded on (a) pronunciation and (b) correct number vocabulary.
Difference between on pitch and frequency
Answer:
A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave. I hope I got it correct !!
Four identical metallic objects carry the following charges 1.82 6.65 4.80 and 9.30 C The objects are brought simultaneously into contact so that each touches the others Then they are separated a What is the final charge on each object b How many electrons or protons make up the final charge on each object
Answer:
a) 5.64 C
b) 3.5*10¹⁹ protons
Explanation:
a)
Since the four metallic objects are identical, and total charge must be conserved, this means that after brought simultaneously into contact so that each touches the others, once separated, total charge must be the same than before being brought in contact.But due they are identical, after charges were able to transfer freely between them, the four objects must have the same final charge, i.e. the fourth part of the total charge, as follows:[tex]Q_{n} = \frac{Q_{tot}}{4} = \frac{22.57C}{4} = 5.64 C (1)[/tex]
b)
This charge will be divided between n protons, since the charge is positive.Since each proton carries a charge equal to the elementary charge e, which value is 1.6*10⁻¹⁹ C, we can find the number of protons in excess, doing the following calculation: [tex]n_{p} =\frac{Q_{n}}{e} = \frac{5.64C}{1.6e-19C} = 3.5 e19 C (2)[/tex]
Your dog runs in a straight line for a distance of 43m in 28s
What is your dog's average speed?
Answer:
Explanation:
Hope this helps!
Lex launched a golfball with his lego catapult. It traveled 7 meters and was in the air for 2 seconds. Please determine the object’s maximum height, horizontal velocity, vertical velocity, actual velocity, and time it reached its maximum height. The angle of release (the catapult’s arm) is 40°.
Horizontal Velocity = vx
Vertical Velocity = V1y
Actual Velocity: V1 = Vactual
Time reached highest point
Height reached!= h
Givens:
dx=
a=
t=
Angle of release:
Table B:
What you need to determine
Formula used
Answer: remember to label the correct units
Distance
Measure it with a meter stick
Time Traveled
Measure it with a stopwatch
Horizontal Velocity
Vertical Velocity
Actual Velocity
Time reached Highest Point
What was the object’s highest point
Answer:
Explanation:
Range R = 7 m
angle of projection θ = 40⁰
u² sin2θ / g = R where u is velocity of throw.
u² sin 80 / g = 7
u² = 69.71
u = 8.35 m/s
horizontal velocity = u cos 40 = 8.35 cos 40
= 6.4 m /s
vertical velocity = u sin 40 = 8.35 sin40
= 5.37 m /s
Maximum height :-
v² = u² - 2gh , u is initial vertical component of throw.
0 = 5.37² - 2 x 9.8 x h
h = 1.47 m
Time to reach max height :--
v = u - gt
o = 5.37 - 9.8 t
t = .55 s
how is the side of the construction paper with sunblock lotion different from the side without sunblock lotion
Answer:
The side of the paper with sunblock lotion stays on its the same color/tone while the other side of the paper without sunblock lotion faded
Explanation:
Ultraviolet (UV) radiation from the sun is the main cause of skin cancer, so one of the best ways to prevent skin cancer is to protect your skin from sun exposure with the use of sunscreen/sunblock. The sunlight that reaches us is made up of two types of harmful rays: long waves (UVA) and short waves (UVB)
A vibration platform oscillates up and down with a fixed amplitude of 9.7 cm and a controlled frequency that can be varied. If a small rock of unknown mass is placed on the platform, at what frequency will the rock just begin to leave the surface so that it starts to clatter?
Answer:
1.6 Hz
Explanation:
In simple harmonic motion, acceleration is given by the formula;
a = Aω²
Where;
A is amplitude
ω is angular velocity.
We are given A = 9.7 cm = 0.097 m
We know that acceleration due to gravity is 9.8 m/s².
Thus;
9.8 = 0.097ω²
ω² = 9.8/0.097
ω = √101.031
ω = 10.05 rad/s
Formula for frequency is;
f = ω/2π
Thus;
f = 10.05/2π
f = 1.6 Hz
Which of the following statements is true?
Answer:
Aluminum and steel are good conductors of electricity.
Explanation:
1) All materials are good conductors of electricity.
This is false because nonmetal materials such as plastic or wood cannot conduct electricity.
2) Aluminum and steel are good conductors of electricity.
This is true. All metals are conductors of electricity.
3) Gold and wood are poor conductors of electricity.
This is false. Although gold can conduct electricity, wood can't.
4) Plastic and copper are good conductors of electricity.
This is false. Although copper can conduct electricity, plastic can't.
I hope this helps!
Answer:
B) Aluminum and steel are good conductors
Explanation:
What is the melting point of substance A?
Answer:
200 Degrees Celsius
Explanation:
Liquid water is nearly 1,000 times denser than air. Thus, for every 32.0 feet (9.75 m) a scuba diver descends below the water's surface, the pressure increases by 1.00 atm. Human lungs have a volume of approximately 3.50 L. If a scuba diver descends to a depth of 80.0 feet where the pressure is 3.50 atm (2.50 atm from the water and 1.00 atm from the air pressure), then by how much does the volume of a 3.50 L surface sample of air decrease
Answer:
ΔV = -2.1 L
Explanation:
To solve this exercise we can use the ideal gas equation for two points
PV = nRT
P₁V₁ = P₂ V₂
where point 1 is on the surface and point 2 is at the desired depth,
V₂ = [tex]\frac{P_1}{P_2} \ V_1[/tex]
let's calculate
V₂ = ( [tex]\frac{1 atm}{2.5 atm}[/tex] ) 3.5 L
V₂ = 1.4 L
this is the new volume, the change in volume is
ΔV = V₂ -V₁
ΔV = 1.4-3.5
ΔV = -2.1 L
select the correct answer
what is meditation
A. a state of consciousness
B. hypnosis
C. an altered state of consciousness
D. a sleeping disorder
C. an altered state of consciousness
or
A. a state of consciousness
(i think its A but this is my answer sorry if its wrong)
Answer:
C
Explanation:
i got it right on edmentum
Fill in the blank. Consider the inverse square law: When light leaves a light bulb, it spreads out over more and more space as it goes. This makes the light thinner, with less and less light present the further from the light bulb we look. If we stand looking at a light bulb and see how bright it is, then move to be four times farther away from the light bulb, the light from the bulb will look ____________ less bright. Group of answer choices
Answer:
Explanation:
Intensity of light is inversely proportional to distance from source
I ∝ 1 /r² where I is intensity and r is distance from source . If I₁ and I₂ be intensity at distance r₁ and r₂ .
I₁ /I₂ = r₂² /r₁²
If r₂ = 4r₁ ( given )
I₁ / I₂ = (4r₁ )² / r₁²
= 16 r₁² / r₁²
I₁ / I₂ = 16
I₂ = I₁ / 16
So intensity will become 16 times less bright .
"16 times " is the answer .
Consider the situation||: A child pulls a sled by a rope across the lawn at a constant speed. Of the forces listed, identify which act upon the sled.
Normal, Gravity, Applied, Friction, Tension, & Air Resistance
Answer:
Gravitational
Tension
Normal
Friction.
Explanation:
The forces acting on the sled are:
Tension: the tension from the rope, this is the force that "moves" the sled.
Friction: kinetic friction between the sled and the ground as the sled moves.
There are another two forces that also act on the sled, but that "has no effect"
Gravitational force: This force pulls the sled down, against the floor.
Normal force: This force "opposes" to the gravitational one, so they cancel each other.
These two forces cancel each other, so they have no direct impact on the movement of the sled. BUT, the friction force depends on the weight of the moving object, and the weight of the moving object depends on the gravitational force, so we need gravitational force in order to have friction force.
Then we can conclude that the forces acting on the sled are:
Gravitational
Tension
Normal
Friction.
Basketball is a target game. true or false
Answer:
true
Explanation:
because this is a favorite game i i think it us better
In this diagram, heat energy is being added over time. The vertical axis shows an increase in temperature, and the horizontal axis shows the passage of time. What is happening to the temperature at Point B?
1. The temperature is rising as the molecules break apart from each other.
2. The temperature is not rising because the heat is being used to break the connections between the molecules.
3. The temperature is dropping as the molecules break apart from each other.
4. The temperature is not rising because the molecules are slowing down.
Answer:
2. The temperature is not rising because the heat is being used to break the connections between the molecules.
Explanation:
I remember doing this question and this is the correct answer i just know it by heart.
just trust me by the heart
A body having mass 200g id moving with velocity 120m\s. What is its power
Answer:
P = 24 watts
Explanation:
Given that,
Mass, m = 200 g = 0.2 kg
Velocity of the body, v = 120 m/s
We need to find the power of the body. The formula for power is given by :
P = Fv
Here, F = W (weight) i.e. mg
So,
P = 0.2 × 120
P = 24 Watts
So, the power of the body is 24 watts.
According to the Law of Universal Gravitation, which scenario would generate the most
gravitational force?
2 turtles, 20 m apart
2 turtles, 200 m apart
2 turtles, 2000 m apart
Answer:
im not 100 percent but its probably 2 turtles 20m apart
PLEASE HELP!!!! ITS URGENT!!!
Answer:
dude the answer is upright