Unit Test — Cumulative exam Answers

A twirler’s baton is 0.76 m long and spins around its center. The end of the baton has a centripetal acceleration of 47.8 m/s2.

In which scenario is the greatest amount of work done on a wagon?

The gravitational force between two objects is 1600 N. What will be the gravitational force between the objects if the distance between them doubles?

The acceleration due to gravity on Earth is 9.8 m/s2. What is the weight of a 75 kg person on Earth?

A ball moves in a circle at the end of a string, as shown.

A puppy finds a rawhide bone and begins to pull it with a force, Ft. The free-body diagram is shown.

What is the approximate tangential speed of an object orbiting Earth with a radius of 1.8 × 108 m and a period of 2.2 × 104 s?

A velocity vs. time graph for an object is shown.

Russ makes the diagram below to organize his notes about how Newton’s first law describes objects at equilibrium.

A car with a mass of 1,500 kg requires a centripetal force of 640 N to safely follow a circular curve in the road at 13.4 m/s.

A wind turbine takes in energy from wind with the goal of converting it into electrical energy. Much of the wind energy is also converted into the kinetic energy of the spinning turbine and heat lost to the air around it.

A car manufacturer wants to change its car’s design to increase the car’s acceleration. Which changes should the engineers consider making to the design?increase the force that the engine providesdecrease the force that the engine providesincrease the mass of the cardecrease the mass of the carincrease the top velocity the car can traveldecrease the top velocity the car can travel

If all else stays the same, which change could be made to cause an increase in the gravitational force on a space shuttle?

The image shows a pendulum that is released from rest at point A.

Rebekah finds that a solution of sugar in water has a volume of 1.32 fl. oz. How should she report this amount using the metric system? (1 fl. oz. = 29.6 mL)

A car moving south speeds up from 10 m/s to 40 m/s in 15 seconds. What is the car’s acceleration?

A stretched spring has 5184 J of elastic potential energy and a spring constant of 16,200 N/m. What is the displacement of the spring?

According to the scientific observation that energy is conserved in a "closed system,” no machine can do work on its surrounding environment forever. This observation has been made over and over again in all sciences, and no example has been found that disproves the fact of conservation of energy.

What is the horizontal acceleration of a ball that is launched horizontally with a velocity of 5.6 m/s?

What is the most likely reason that a hypothesis would be useful even if experiments show that it is false?