Question

QUESTION 6
1. Juan lifts a box on the floor. If you lift the same box twice the previous height, it has

a.. four times the potential energy

b. double the potential energy

c. no change in potential energy

d. maximum kinetic energy KE
   

QUESTION 7
1. When a particle moves in a circle with constant speed, its acceleration always occurs

a. Perpendicular to instantaneous speed

b. Opposed to instantaneous speed

c. Tangent to the circular path

d. There is no acceleration since the speed is constant
   

QUESTION 8
1. A ball of mass m on a string of length R, rotating in a circular motion, with instantaneous velocity v and centripetal acceleration a. What is the centripetal acceleration of the ball if the instantaneous speed of the ball doubles?

a.. a / 4

b. a / 2

c. a

d. 2a

e. 4a

QUESTION 9
1. A car approaches a horizontal circular curve with a radius of 45.0 m. If the concrete pavement is dry and the static coefficient of friction between rubber and concrete is 1.2, at what maximum constant speed will the car be able to take the curve?

a. 12m / s

b. 23 m / s

c. 50m / s

d. 0 m / s `

Answer 1

67 Oi= mgh 1. Ug = ng cah) Uça. 20; b) double the potential energy.