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nata0808 [166]
2 years ago
13

What is the acceleration of a train that takes 22 seconds to go from a speed of 73 kilometers per hour to a speed of 45 kilomete

rs per hour?
Physics
1 answer:
gladu [14]2 years ago
4 0

Answer:

.354 m/s^2

Explanation:

Acceleration is change in velocity  divided by change in time

 (73 - 45 ) = 28 km / hr   velocity change   this is 7.778 m/s

7.778 m/s / 22 s  = .354 m/s^2

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a car traveling at 28 m/s slows down at a constant rate for 4 seconds until it stops. what is its acceleration?
astra-53 [7]
We are given the following conditions:
v_{0} = 28m/s

t = 4s

v_{f} = 0m/s

Since we are told it slows down at a constant rate, we know we are dealing with uniformed accelerated motion, or UAM for short.

So we look at our kinematics equation that contains the given variables.

v_f = v_0 + at

This contains our target variable and our initial conditions. Plug and chug, we get:

(0m/s) = (28m/s) + a(4s) -28m/s = (4s)*a a = -7m/s^2

Thus the answer is:

a = -7m/s^2

Hope this helps!


3 0
3 years ago
Can Jet Fuel burn through Steel Pipes?
Free_Kalibri [48]
Burning jet fuel is not hot enough to fully melt steel. Burning jet fuel, however, is more than hot enough to weaken steel.
8 0
3 years ago
A driver is moving at 17.0 m/s when she sees a child on a bike 65m ahead of her. If the car can brake at 4.9 m/s^2 and the drive
Lera25 [3.4K]

Answer:

The driver can  avoid the child because at the time she brake 1.6s the car just move 20.928 meters so is far to the 65 meters where the kind is

Distance= 20.928 m

Explanation:

V_{o} = 17 \frac{m}{s} \\a= -4.9 \frac{m}{s^{2} }\\ t= 1.6 s

Distance the kid is 65m so the car have to be less in the time she is braking

So to calculated the distance while she is braking

X_{f} = X_{o} +V_{o}*t + \frac{1}{2} * a *t^{2}\\ X_{f} = 0m +17 \frac{m}{s} *1.6 s + \frac{1}{2} * 4.9 \frac{m}{s^{2} } *(1.6s)^{2}\\X_{f} = 27.2 m+ (-6.272 m)\\X_{f} = 20.928 m

The distance of the car is less than the distance of the kid in his bike

So she didn't hit him

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3 years ago
The principal of uniformitarian states that
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It started that the present is the key to the past. The process that we see in operation today are the same ones that have operated in the geologic past.
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3 years ago
The grid in a triode is kept negatively charged to prevent...
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I think the correct answer is the third statement, electron from escaping from the tube containing the triode. The negative charge on the grid repels any electron in the tube. As a result,the flow of current is controlled. If the field is that strong, all current flow will stop resulting to maintaining the electron cloud in the tube. 
4 0
3 years ago
Read 2 more answers
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