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Olin [163]
4 years ago
11

A student in the front of a school bus tosses a ball to another student in the back of the bus while the bus is moving forward a

t constant velocity. The speed of the ball as seen by a stationary observer in the street:_________
a. is less than that observed inside the bus.
b. is the same as that observed inside the bus
c. may be either greater or smaller than that observed inside the bus.
d. may be either greater, smaller, or equal to that observed inside the bus.
e. is greator than that observed inside the bus
Physics
1 answer:
Veronika [31]4 years ago
6 0

Answer:

d

Explanation:

good question. now the bus is moving in constant velocity . a student in front tosses a ball to the student in back. but we dont know the speed at which the student tosses a ball. we have to assume the speed

assume the speed of ball is slightly less than the speed of bus. in this case the stationary observer sees the ball in slower speed than the one inside the bus.

so a is correct

now assume the speed of ball is 1/2 the speed of bus. here stationary observer sees the ball the same speed as the one in bus observe

b is correct

assume the speed of ball is very small than the speed of bus . in this case the stationary observer see in grater speed than the student in bus

e also correct

so correct answer is d. it depends on the speed of ball tossed by the student in front.

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A solid cylinder is mounted above the ground with its axis of rotation oriented horizontally. A rope is wound around the cylinde
Romashka [77]

Answer:

(a)10.5 rad/s2

(b) 20.9 rev

(c) 47.27 m

Explanation:

As the block of mass 53 kg is falling and pulling on the rope. The tension force on the rope must be equal to the gravity acting on the block according to Newton's 3rd law

T = mg = 53*9.81 = 519.93  N

Since this tension force would rotate the cylinder freely without any friction. The torque created by this tension force is

To = TR = 519.93  * 0.36 = 187.17 Nm

This solid cylinder would have a moment of inertia around it's rotating axis of:

I = \frac{mR^2}{2} = \frac{275 * 0.36^2}{2} = 17.82kgm^2

(a)We can use Newton's 2nd law to calculate the angular acceleration exerted by such torque on the solid cylinder

\alpha = \frac{To}{I} = \frac{187.17}{17.82} = 10.5 rad/s^2

(b) With such constant angular acceleration, the angle it would make after 5s is

\theta = \frac{\alphat^2}{2} = \frac{10.5*5^2}{2} = 131.3 rad

Since each revolution equals to 2\pi rad of angle, we can calculate the number of revolution it makes

\frac{\theta}{2\pi} = \frac{131.3}{6.28} \approx 20.9 rev

(c) Assume the thickness of the rope is negligible (and its wounded radius is unchanging), we can calculate the rope length unwinded after rotating 131.3rad

\theta R = 131.3*0.36 = 47.27 m

3 0
3 years ago
Which of the following materials offer the least electrical resistance? Pure water, wood, salt water, glass
Vanyuwa [196]

Salt water offers the least electrical resistance.

<u>Explanation:</u>

Least electrical resistance indicates that any material which readily allows the electric current through itself, and shows more conductivity.

Here pure water doesn't contain any ions, so it is a bad conductor.

Wood and glass are also bad conductors of electricity.

Salt water contains ions, which conducts electricity which means it shows least electrical resistance.

5 0
3 years ago
If net force is zero, the what will be constant.
vodomira [7]

Answer:

The ans is velocity

Explanation:

Hope it helps you

8 0
3 years ago
Read 2 more answers
The bass tones rattling the windows of the car next to you at a red light are at a __________.
Andrew [12]
... low frequency and high amplitude.
4 0
3 years ago
A student walks to the right 25-m along the 800 hall in 15-s. They turn around and walk 15-m to the left in 8.0-s. Calculate the
Ludmilka [50]

Answer:

Explanation:

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Total time = 15 + 8 = 23 s

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Total time = 15 + 8 = 23 s

Average velocity = total displacement / total time

= 10 / 23

= .434 m / s to the right .

3 0
4 years ago
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