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What we found:

A rock is whirled on the end of a string in a horizontal circle of radius R with a constant period T. If the radius of the circle is reduced to R/3, while the period remains T, what happens to the centripetal acceleration (ac) of the rock?

Two object rests on a platform rotating at constant speed. Object A is at distance of half the platform’s radius from the center. Object B lays at edge of the platform. Assuming the platform continues rotating at the same speed, how does the centripetal force of the two objects compare?

Two wires are tied to the 500 g sphere shown below. The sphere revolves in a horizontal circle at a constant speed of 7.2 m/s. What is the tension in the upper wire? What is the tension in the lower wire?

The ultracentrifuge is an important tool for separating and analyzing proteins. Because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. Any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. Suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. If the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 60000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples?

A concrete highway curve of radius 60.0 m is banked at a 12.0 ° angle. What is the maximum speed with which a 1300 kg rubber-tired car can take this curve without sliding? (Take the static coefficient of friction of rubber on concrete to be 1.0.)

A 1.00 kg mass is attached to a 0.800 m long string and spun in a vertical circle. The mass completes 2.00 revolution in 1.00 s.

A car is safely negotiating an unbanked circular turn at a speed of 21 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a wet patch in the road decreases the maximum static frictional force to one-third its dry road value. If the car is to continue safely around the curve, to what speed must the driver slow the car?

A car travels at a constant speed around a circular track whose radius is 2.6 km. the car goes once around the track in 360 s. What is the magnitude of the centripetal acceleration of the car?

A speed skater goes around a turn that has a radius of 31 m. The skater has a speed of 14 m/s and experiences a centripetal force of 460 N. What is the mass of the skater?

A 5.0 g coin is placed 15 cm from the center of a turntable. The coin has coefficients of static and kinetic friction of µs = 0.80 and µk = 0.50. The turntable slowly speeds up to 60 rpm. Does the coin slide off the turntable?

A 2.00 x102 g block on a 50.0 cm long string swings in a circle on a horizontal, frictionless table at 75.0 rpm. What is the speed of block? What is the tension in the string?

A conical pendulum is formed by attaching a ball of mass m to a string of length L, then allowing the ball to move in a horizontal circle of radius R.

Two identical satellites are placed in orbit, one orbits Mars, the second orbits Jupiter. The orbital speeds of each satellite are the same. Which satellite has a greater orbital radius?

The International Space Station has a mass of 4.2 x105 kg and orbits Earth at a distance of 4.0 x102 km above the surface. Earth has a radius of 6.37 x106 m, and mass of 5.97 x104 kg. Calculate…

All Resources

Everything you need to master Physics — for free.

AI Problem Solver

Meet Phy. The world's most advanced personal AI tutor.

UBQ

Learning supercharged. 1000+ Physics problems + AI help.

Speed Reviews

7 AP Physics 1 units condensed into 8 short articles.

AP Phys. Exam Prep

Proven tip, tricks, and hacks to help you score that coveted five.

Learn from Scratch

Learn Physics, from scratch at your own pace.

Elite 1-to-1 Coaching

Guaranteed performance boost in scores and understanding.

AP Exam Prep

5 weeks for a 5. Expedited progress. Stellar Results.

Learn AP Physics

1-to-1 lessons covering AP Physics from start to end.

All Other Programs

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What we found:

A rock is whirled on the end of a string in a horizontal circle of radius R with a constant period T. If the radius of the circle is reduced to R/3, while the period remains T, what happens to the centripetal acceleration (ac) of the rock?

Two object rests on a platform rotating at constant speed. Object A is at distance of half the platform’s radius from the center. Object B lays at edge of the platform. Assuming the platform continues rotating at the same speed, how does the centripetal force of the two objects compare?

Two wires are tied to the 500 g sphere shown below. The sphere revolves in a horizontal circle at a constant speed of 7.2 m/s. What is the tension in the upper wire? What is the tension in the lower wire?

A concrete highway curve of radius 60.0 m is banked at a 12.0 ° angle. What is the maximum speed with which a 1300 kg rubber-tired car can take this curve without sliding? (Take the static coefficient of friction of rubber on concrete to be 1.0.)

A 1.00 kg mass is attached to a 0.800 m long string and spun in a vertical circle. The mass completes 2.00 revolution in 1.00 s.

A car travels at a constant speed around a circular track whose radius is 2.6 km. the car goes once around the track in 360 s. What is the magnitude of the centripetal acceleration of the car?

A speed skater goes around a turn that has a radius of 31 m. The skater has a speed of 14 m/s and experiences a centripetal force of 460 N. What is the mass of the skater?

A 5.0 g coin is placed 15 cm from the center of a turntable. The coin has coefficients of static and kinetic friction of µs = 0.80 and µk = 0.50. The turntable slowly speeds up to 60 rpm. Does the coin slide off the turntable?

A 2.00 x102 g block on a 50.0 cm long string swings in a circle on a horizontal, frictionless table at 75.0 rpm. What is the speed of block? What is the tension in the string?

A conical pendulum is formed by attaching a ball of mass m to a string of length L, then allowing the ball to move in a horizontal circle of radius R.

Two identical satellites are placed in orbit, one orbits Mars, the second orbits Jupiter. The orbital speeds of each satellite are the same. Which satellite has a greater orbital radius?

The International Space Station has a mass of 4.2 x105 kg and orbits Earth at a distance of 4.0 x102 km above the surface. Earth has a radius of 6.37 x106 m, and mass of 5.97 x104 kg. Calculate…

Nerd Notes

Discover the world's best Physics resources

Everything you need to master Physics — for free.

Meet Phy. The world's most advanced personal AI tutor.

Learning supercharged. 1000+ Physics problems + AI help.

7 AP Physics 1 units condensed into 8 short articles.

Proven tip, tricks, and hacks to help you score that coveted five.

Learn Physics, from scratch at your own pace.

Guaranteed performance boost in scores and understanding.

5 weeks for a 5. Expedited progress. Stellar Results.

1-to-1 lessons covering AP Physics from start to end.

Other 1-to-1 and group programs to accelerate Physics mastery.

What we found:

Nerd Notes

Discover the world's best Physics resources

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