Exam 5: Circular Motion, the Planets, and Gravity

A car can move at constant speed on a level curve on a highway as long as the force of ___________ between the pavement and tires is sufficient to provide the necessary centripetal force.

Arnold can bench press 315 pounds in his gym in California. That is exactly six big 45-pound weight plates and the 45-pound bar. He can lift all that one time, but he cannot lift 325 pounds even once. At the NASA gym on the Moon, Arnold would

The mass of an apple on the Earth is 0.2 kg. On the Moon, the mass of the same apple would be

Two cyclists of different mass take a turn on a level road. They follow the same path and are moving the same constant speed for the turn. Which of the following statements is correct?

A rock that weighs 100 lb on Earth is taken to the Moon. Which of the following statements accurately describes what would be observed?

An object weighs 30 newtons on Earth. What is its approximate mass?

The orbit of Comet UX209 about the Sun is not a circle but it orbits once every 365 days, just as Earth does. UX209 is closer to the Sun in April than it is in October. Thus, the speed of UX209 as it moves along its orbit is

An object undergoes uniform circular motion. Which pair of vectors is perpendicular?

A car travels around a curve with constant speed. The correct statement from the following is

If two bicyclists move around a circular track of radius 100 m, at the same speed, 10 m/s, but in opposite directions, then

If a ball at the end of a string is whirled in a vertical circle at constant speed, the tension will be

A cyclist races around a circular track at the constant speed of 20 m/s. The radius of the track is 40 m. The dentripetal acceleration of the cyclist is

A person weighing 500 N rides on a Ferris wheel sitting on a bathroom scale. At the highest point of motion, the scale reads 200 N while the person continues to move in a circular path. The centripetal force on the person at this point is ___________ N.

Earth's gravity attracts a person with a force of 120 lbs. The force with which the Earth is attracted towards the person is

You spin your little brother on a "helicopter" ride, which means you hold hands and spin around a vertical axis, usually resulting in the little brother's feet lifting off the ground. During the "ride", the acceleration of your brother is

In Vienna, there is a Ferris wheel designed so that the passengers ride in a standing position. If one of the passengers were standing on a bathroom scale while the ride rotated at a constant speed, the scale would read lowest at

In order to move in a perfectly circular path, the net force on an object must

A ball is whirled on the end of a string in a horizontal circle at constant speed. Suddenly, the string breaks. Immediately after the string breaks, the ball will

Strictly speaking, Newton's law of universal gravitation, F = Gm₁m₂/r², is valid only if the masses are either point masses or __________________.

During a new Moon, when the Sun and the Moon are on the same side of the Earth, the people who live next to the ocean will see about how many high tides per day?