Chapter-3 Mr. Paul Physics

A 0.50-kilogram object moves in a horizontal circular path with a radius of 0.25 meters at a constant speed of 4.0 meters per second. What is the magnitude of the object’s acceleration?

• 64 m/s²

• 32 m/s²

• 72 m/s²

• 54 m/s²

A 1750-kilogram car travels at a constant speed of 15.0 meters per second around a horizontal, circular track with a radius of 45.0 meters. The magnitude of the centripetal force acting on the car is

• 8750 N

• 8570 N

• 7850 N

• 5870 N

An engineer is planning a road with a turn. If the speed limit is 20 m/s and the centripetal acceleration cannot exceed 8.5 m/s2, how big must the radius of the turn be?

• 47 m

• 37 m

• 27 m

• 19 m

According to Newton's law of gravitation- Force is directly proportional to the product of the mass and velocity.

• True

• False

The unit of Universal Gravitational Constant, G is

• Nm²/ kg²

• kg² m/s

• m/s kg

• kg N

A 65.0 kg astronaut is walking on the surface of the Moon, which has a mean radius of 1.74 × 10⁶ km and a mass of 7.35 × 10²² kg. What is the weight of the astronaut?

Take G = 6.67 x 10^-11 Nm² / kg²

• 35 N

• 45 N

• 55 N

• 105 N

What will happen to the Centripetal Force if the velocity is doubled?

• The Centripetal force will increase by double

• The Centripetal force will increase by four times

• The Centripetal force will decrease by double

• The Centripetal force will decrease by half

The centripetal acceleration and centripetal force are inversely proportional to the radius of the circular motion.

• True

• False