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Physics 101 Mechanics
November 2021
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Physics 101 Mechanics
Q&A Archive of
November 5, 2021
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November 5 of 2021
A figure skater is spinning with her arms held straight out. Which has greater rotational speed, her shoulders or her fingertips? Why?
Suppose the bob on a pendulum is released at twice its original heigh. What is its maximum kinetic energy?
how fast would a person with a mass of 100kg have to run to have the same momentum as an 18 wheeler with a mass of 24,000 kg rolling at 1 mph?
A freely falling object requires 1.50 s to travel the last 30.0 m before it hits the ground. From what height above the ground did it fall?
Problem 6: A light-rail commuter train accelerates at a rate of 1.35 m/s2 . i. How long does it take to reach its top speed of 80.0 km/h, starting from rest? ii. The same train ordinarily brakes at a rate of ?1.65 m/s2 . How long does it take to come to a stop from its top speed? iii. In…
A commuter backs her car out of her garage with an acceleration of 1.40 m/s2 . i. How long does it take her to reach a speed of 2.00 m/s? ii. If she then brakes to a stop in 0.800 s, what is her acceleration?
A commuter backs her car out of her garage with an acceleration of 1.40 m/s2 . i. How long does it take her to reach a speed of 2.00 m/s? ii. If she then brakes to a stop in 0.800 s, what is her acceleration?
3) A 1-m3 tank contains 2.841 kg of steam at 0.6 MPa. Determine the temperature of the steam, using (a) The ideal gas equation; (b) The van der Waals equation; (c) The thermodynamics properties table
How many longitudinal modes are there
A 42.0 kg block is pushed at a constant speed up a 24.0 deg incline by an applied force parallel to the incline. If the coefficient of kinetic friction between the block and the incline is 0.340, find the magnitude of the applied force.
A runner has completed a five-lap marathon with the following displacements: d1=6km, West; d2=7km, 40 degrees South of West; d3=9km, North; d4=4km, 30 degrees South of East; and d5=8km, 70 degrees North of East. How far is the runner from his starting position (magnitude and direction)?
Assume that the space shuttle orbited Earth at altitudes of around 3.00×105 m. Determine the time T for one orbit of the shuttle about Earth. How many sunrises per day, n, did the astronauts witness?
Very high?speed ultracentrifuges are useful devices to sediment materials quickly or to separate materials. An ultracentrifuge spins a small tube in a circle of radius 12.9 cm at 8.00×104 rev/min. What is the centripetal force ????cent experienced by a sample that has a mass of 2.70 g?
An object is being acted upon by three forces and as a result moves with a constant velocity. One force is 17.7 N along the +x-axis and the second is 23.4 N along the +y-axis. What is the magnitude of the third force?
A spring with spring constant k = 125 N/m is used to pull a 25 N wooden block horizontally across a tabletop. The coefficient of friction between the block and the table is µ k = 0.20. By how much does this spring stretch from its equilibrium length?
A 20 cm long spring is attached to a wall. When pulled horizontally with a force of 100 N, the spring stretches to a length of 22 cm. What is the value of the spring constant? The same spring is now used in a tug of war. Two people pull on the ends, each with a force of 100 N. How long…
Very high?speed ultracentrifuges are useful devices to sediment materials quickly or to separate materials. An ultracentrifuge spins a small tube in a circle of radius 12.9 cm at 8.00×104 rev/min. What is the centripetal force ????cent experienced by a sample that has a mass of 2.70 g?
Revolutionaries attempt to pull down a statue of the Great Leader by pulling on a rope tied to the top of his head. The statue is 17 m tall, and they pull with a force of 4200 N at an angle of 65° to the horizontal. What is the torque they exert on the statue? If they are standing to the…
Can I get help with this question please?
A coin that has a mass of 25.0 g rests on a phonograph turntable that rotates at 61.0 rev/min. The center of the coin is 13.0 cm from the turntable axis. If the coin does not slip, what is the minimum value of the coefficient of static friction ????s between the coin and the…
An amusement park ride called the Rotor debuted in 1955 in Germany. Passengers stand in the cylindrical drum of the Rotor as it rotates around its axis. Once the Rotor reaches its operating speed, the floor drops but the riders remain pinned against the wall of the cylinder. Suppose the…
Find the resultant of an east-pointing force of 218 N and a south-pointing force of 157 N
What force is required to keep a 12.5 kg wood block sliding, at a constant velocity, over a horizontal concrete surface? u_static = 0.550, u_kinetic = 0.352.
Convert 5mm to m
A car passes a sign post travelling at 80.0 km/h and immediately accelerates (faster) uniformly at 0.875 m/s2 for 6.00 s. Determine (a) the final speed, and (b) the distance that the car travels past the sign post in 6.00s.
A light string passes over a light frictionless pulley and has a 275 g load attached to one end and a 120 g load attached to the other end. If the system is allowed to fall freely, what is the magnitude of the acceleration?
A 12.0 g rifle bullet is fired with a speed of 370 m/s into a ballistic pendulum with mass 9.00 kg, suspended from a cord 70.0 cm long.
An amusement park ride called the Rotor debuted in 1955 in Germany. Passengers stand in the cylindrical drum of the Rotor as it rotates around its axis. Once the Rotor reaches its operating speed, the floor drops but the riders remain pinned against the wall of the cylinder. Suppose the…
A figure skater is spinning with her arms held straight out. Which has greater rotational speed, her shoulders or her fingertips? Why?
Suppose the bob on a pendulum is released at twice its original heigh. What is its maximum kinetic energy?
how fast would a person with a mass of 100kg have to run to have the same momentum as an 18 wheeler with a mass of 24,000 kg rolling at 1 mph?
A freely falling object requires 1.50 s to travel the last 30.0 m before it hits the ground. From what height above the ground did it fall?
Problem 6: A light-rail commuter train accelerates at a rate of 1.35 m/s2 . i. How long does it take to reach its top speed of 80.0 km/h, starting from rest? ii. The same train ordinarily brakes at a rate of ?1.65 m/s2 . How long does it take to come to a stop from its top speed? iii. In…
A commuter backs her car out of her garage with an acceleration of 1.40 m/s2 . i. How long does it take her to reach a speed of 2.00 m/s? ii. If she then brakes to a stop in 0.800 s, what is her acceleration?
A commuter backs her car out of her garage with an acceleration of 1.40 m/s2 . i. How long does it take her to reach a speed of 2.00 m/s? ii. If she then brakes to a stop in 0.800 s, what is her acceleration?
How many longitudinal modes are there
A 42.0 kg block is pushed at a constant speed up a 24.0 deg incline by an applied force parallel to the incline. If the coefficient of kinetic friction between the block and the incline is 0.340, find the magnitude of the applied force.
Assume that the space shuttle orbited Earth at altitudes of around 3.00×105 m. Determine the time T for one orbit of the shuttle about Earth. How many sunrises per day, n, did the astronauts witness?
Very high?speed ultracentrifuges are useful devices to sediment materials quickly or to separate materials. An ultracentrifuge spins a small tube in a circle of radius 12.9 cm at 8.00×104 rev/min. What is the centripetal force ????cent experienced by a sample that has a mass of 2.70 g?
An object is being acted upon by three forces and as a result moves with a constant velocity. One force is 17.7 N along the +x-axis and the second is 23.4 N along the +y-axis. What is the magnitude of the third force?
A spring with spring constant k = 125 N/m is used to pull a 25 N wooden block horizontally across a tabletop. The coefficient of friction between the block and the table is µ k = 0.20. By how much does this spring stretch from its equilibrium length?
A 20 cm long spring is attached to a wall. When pulled horizontally with a force of 100 N, the spring stretches to a length of 22 cm. What is the value of the spring constant? The same spring is now used in a tug of war. Two people pull on the ends, each with a force of 100 N. How long…
Very high?speed ultracentrifuges are useful devices to sediment materials quickly or to separate materials. An ultracentrifuge spins a small tube in a circle of radius 12.9 cm at 8.00×104 rev/min. What is the centripetal force ????cent experienced by a sample that has a mass of 2.70 g?
Revolutionaries attempt to pull down a statue of the Great Leader by pulling on a rope tied to the top of his head. The statue is 17 m tall, and they pull with a force of 4200 N at an angle of 65° to the horizontal. What is the torque they exert on the statue? If they are standing to the…
Can I get help with this question please?
A coin that has a mass of 25.0 g rests on a phonograph turntable that rotates at 61.0 rev/min. The center of the coin is 13.0 cm from the turntable axis. If the coin does not slip, what is the minimum value of the coefficient of static friction ????s between the coin and the…
An amusement park ride called the Rotor debuted in 1955 in Germany. Passengers stand in the cylindrical drum of the Rotor as it rotates around its axis. Once the Rotor reaches its operating speed, the floor drops but the riders remain pinned against the wall of the cylinder. Suppose the…
Find the resultant of an east-pointing force of 218 N and a south-pointing force of 157 N
What force is required to keep a 12.5 kg wood block sliding, at a constant velocity, over a horizontal concrete surface? u_static = 0.550, u_kinetic = 0.352.
Convert 5mm to m
A car passes a sign post travelling at 80.0 km/h and immediately accelerates (faster) uniformly at 0.875 m/s2 for 6.00 s. Determine (a) the final speed, and (b) the distance that the car travels past the sign post in 6.00s.
A light string passes over a light frictionless pulley and has a 275 g load attached to one end and a 120 g load attached to the other end. If the system is allowed to fall freely, what is the magnitude of the acceleration?
A 12.0 g rifle bullet is fired with a speed of 370 m/s into a ballistic pendulum with mass 9.00 kg, suspended from a cord 70.0 cm long.
An amusement park ride called the Rotor debuted in 1955 in Germany. Passengers stand in the cylindrical drum of the Rotor as it rotates around its axis. Once the Rotor reaches its operating speed, the floor drops but the riders remain pinned against the wall of the cylinder. Suppose the…