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3 years ago

A speed-time graph is shown below:

Physics

1 answer:

alexandr1967 [171]3 years ago

3 0

Answer:

The average acceleration of the object is 0.5 cm/s^2. Answer: A)

Explanation:

Average Acceleration

The average acceleration of a moving object is the rate at which the speed changed over time in a specific period. It can be calculated as follows:

$\displaystyle \bar a=\frac{v_f-v_o}{t}$

Where vf is the final speed, vo is the initial speed and t is the time.

The speed-time shows the speed starts at 0 cm/s and ends at 4 cm/s over the 8 seconds period. The average acceleration is:

$\displaystyle \bar a=\frac{4-0}{8}=0.5$

The average acceleration is 0.5 cm/s^2

A) Correct. The average acceleration is 0.5 cm/s^2

B) Incorrect. The average acceleration is 0.5 cm/s^2

C) Incorrect. The average acceleration is 0.5 cm/s^2

D) Incorrect. The average acceleration is 0.5 cm/s^2

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3 years ago

A total electric charge of 6.75 nC is distributed uniformly over the surface of a metal sphere with radius 20.0 cm. If the poten

djverab [1.8K]

Answer:

a) 60 V

b) 125 V

c) 125 V

Explanation:

Given

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Required

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(b) r = 20.0 cm

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V = q/4 $\pi$ ∈_o (1)

r is the distance where the potential is measured and the term 1/4 $\pi$ ∈_o equals 9.0 x 10^9 Nm^2/C^2. Now we can plug our values for q and r into equation (1) to get the potential V where r = 0.10 m

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(b) Here the distance r is the same for the radius R, so we can get the potential inside the sphere (r = R) where the potential is given by

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V= 125 V

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