Question

21. An object m is tied to one end of a string, moves in a circle with a constant speed v on a horizontal frictionless table. The second end of the string is connected to a big mass M and goes through a small hole in the table. What is the value of M if it stays in equilibrium? (A) mv²/rg (B) v²/rmg (C) rg/mv² (D) mv²r/g 22. A heavy (2.0 kg) point-like object rests 2.0m from the center of a rough turntable as the turntable rotates. The period of the turntable's rotation is 5.0 seconds. The coefficient of kinetic friction between the object and turntable is 0.50, while the coefficient of static friction is 0.80. What is the magnitude of the force of friction acting on the object? (A) 19.6N (B) 16.0N (C) 9.8N (D) 6.3N 23. Two identical cars, one on the moon and one on Earth, are rounding banked curves at the same speed with the same radius and different angles. The acceleration due to gravity on the moon is 1/6 that of Earth. How do the centripetal accelerations of each car compare? A) The centripetal acceleration of the car on Earth is less than that on the moon. B) The centripetal acceleration of the car on Earth is greater than that on the moon. C) The centripetal accelerations are the same for both cars. D) This cannot be determined without knowing the radius and the angle.

          21. An object m is tied to one end of a string, moves in a circle
with a constant speed v on a horizontal frictionless table.
The second end of the string is connected to a big mass M
and goes through a small hole in the table. What is the value
of M if it stays in equilibrium?

(A) mv²/rg (B) v²/rmg (C) rg/mv² (D) mv²r/g

22. A heavy (2.0 kg) point-like object rests 2.0m from the center of a
rough turntable as the turntable rotates. The period of the turntable's
rotation is 5.0 seconds. The coefficient of kinetic friction between the
object and turntable is 0.50, while the coefficient of static friction is
0.80. What is the magnitude of the force of friction acting on the object?

(A) 19.6N (B) 16.0N (C) 9.8N (D) 6.3N

23. Two identical cars, one on the moon and one on Earth, are rounding
banked curves at the same speed with the same radius and different
angles. The acceleration due to gravity on the moon is 1/6 that of Earth.
How do the centripetal accelerations of each car compare?
A) The centripetal acceleration of the car on Earth is less than that
on the moon.
B) The centripetal acceleration of the car on Earth is greater than
that on the moon.
C) The centripetal accelerations are the same for both cars.
D) This cannot be determined without knowing the radius and the
angle.

21. An object m is tied to one end of a string, moves in a circle
with a constant speed v on a horizontal frictionless table.
The second end of the string is connected to a big mass M
and goes through a small hole in the table. What is the value
of M if it stays in equilibrium?

(A) mv²/rg (B) v²/rmg (C) rg/mv² (D) mv²r/g

22. A heavy (2.0 kg) point-like object rests 2.0m from the center of a
rough turntable as the turntable rotates. The period of the turntable's
rotation is 5.0 seconds. The coefficient of kinetic friction between the
object and turntable is 0.50, while the coefficient of static friction is
0.80. What is the magnitude of the force of friction acting on the object?

(A) 19.6N (B) 16.0N (C) 9.8N (D) 6.3N

23. Two identical cars, one on the moon and one on Earth, are rounding
banked curves at the same speed with the same radius and different
angles. The acceleration due to gravity on the moon is 1/6 that of Earth.
How do the centripetal accelerations of each car compare?
A) The centripetal acceleration of the car on Earth is less than that
on the moon.
B) The centripetal acceleration of the car on Earth is greater than
that on the moon.
C) The centripetal accelerations are the same for both cars.
D) This cannot be determined without knowing the radius and the
angle.

Added by Lourdes P.

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