Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

3,567.

A particle of mass 2.5 x 10-6kg revolving around the earth has a radial acceleration of 4 X 107 ms-2. What is the centripetal force of the particles?

A.

6.25 x 10-14N

B.

1.60 x10-13N

C.

5.00 x 10N

D.

1.00x102N

E.

2.00x1O2N

Correct answer is D

F = ma = 2.5 x 10-6 x 4 x 107 = 100N

3,568.

Which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a test tube?

A.

metre rule

B.

A pair of callipers

C.

A micrometer screw gauge

D.

A tape rule

E.

A set square

Correct answer is B

No explanation has been provided for this answer.

3,569.

The electric force between two point charges each of the magnitude, q at a distance of r apart in air of permittivity is:

A.

q2/4πεr

B.

0/q2

C.

4πq/ε0

D.

qr20

E.

0/4πε0r2

Correct answer is E

No explanation has been provided for this answer.

3,570.

Calculate the escape velocity for a rocket fired from the earth's surface at a point where the acceleration due to gravity is 10ms-2 and the radius of the earth is 6 x 106m.

A.

7.8 x 106ms-12

B.

1.1 x 104ms-1

C.

3.5 x 107ms-1

D.

6.0 x 107 ms-1

E.

1.2 x 108ms2-1

Correct answer is B

Hint: V = √2gr = √(2x10x6x106) + 1.1 x 104ms-1