Question

1. A 1500kg vehicle is moving on a dry pavement where the coefficient of friction is 0.80. If the vehicle is traveling at 25m / s, that minimum distance is required to stop it when the brakes are applied.

a. 72m

b. 64m

c. 55m

d. 40m

e. none of the above

2. The position of a point on a rotating disk is given by 0 (t) = 3.00t-2.00t ^ 2 + 1.00t ^ 2 where 0 is in radians and t in seconds. The instantaneous angular acceleration at t = 2.0s is:

a. 7.00rad/s^2

b. 2.00rad/s^2

c. 6.00rad/s^2

d. 8.00rad/s^2

3. A necessary condition for a particle to remain stationary is that the net force acting on the particle is:

a. higher

b. less

c. zero

d. none of the above

4. The weight of a crown is 7.84N. When it is submerged in water (density 1000kg / m ^ 3) the crown has a weight of 6.86N. The buoyant force acting on the crown while it is submerged in water is:

a. 14.7N

b. 0.50N

c. 0.98N

d. none of the above

Answer 1