Question

PLEASE WRITE THIS IN COMPUTER, GIVE ME THE LETTER OF ANSWERS.

1. The instantaneous acceleration as a function of time is:

a. -2.00 k m/s

b. 8.85 j

c. 9.60 i

d. none of the above

2. The collision where we find that the kinetic energy is conserved is known as:

a. inelastic

b. perfectly inelastic

c. elastic

d. None of the above

3. The maximum torque in a rigid body can occur at any angle between the applied force and the axis of rotation.

a. true

b. false

4. The weight of the astronaut in pounds on the surface of the moon is:

a. 22 pounds

b. 436 pounds

c. 30 pounds

d. 50 pounds

e. none of the above

Answer 1

1)(a)-2

r = (9.60ti + 8.85j-1.00t ^ 2k) m

we know that, a = d^2r/dt = d/dt(9.6 i + 8.85 j -2 t) = -2

Hence, a = -2

2)(c)elastic

In an elastic collision both the kinetic energy and momnetum of a body are conserved. while in inealstic collision, only momentum is conserved.

3)False

We know that the torque is given by:

Torque = r F sin(theta)

for maximum value of torque, sin(theta) = 1

theta = sin^-1(1) = 90 deg

Hence, max torque occurs only at 90 deg angle.

4)for calculation of weight mass of astronaut should be given.

W = mg ; g(moon) = 1.62 m/s^2 ; can be converted to lbs

but mass is not mentioned here.