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Physics 101 Mechanics
November 2021
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Physics 101 Mechanics Q&A Archive of November 18, 2021

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November 18 of 2021

Two logs with masses m1 and m2 are connected by a very light rope that goes through a very light pulley (see picture below). The friction in the pulley is negligible. The first log rests on a rough table, 2. log hangs over the edge of the table. ktr is the coefficient of friction between the…

The recommended daily intake for the average person is about 2200 calories. In 2014, the average American consumed about 3800 calories daily(a) With what average power would the average American have to work with in order to consume excess-daily calories? Consider 1 calorie = 4, 18J.(b) For how…

A torque of 72 N·m acts on a wheel with a moment of inertia of 162 kg·m2. If the wheel starts from rest, how long will it take to make 26 revolutions? Give your answer to 2 decimal places.

A torque of 72 N·m acts on a wheel with a moment of inertia of 162 kg·m2. If the wheel starts from rest, how long will it take to make 26 revolutions? Give your answer to 2 decimal places.

Determine the force in each member of the loaded truss. Enter the forces as positive if in tension, negative if in compression

Two balls are hanging from each end of a massless rope. The green ball is pulled upward with constant force F = 120N. The blue ball starts from rest and descends 16 m in 6 seconds. Find the mass of both balls if the tension in the rope is 54N.

for each of the examples below, identify all the external forces acting on the system, and for each of these forces, write down what their work is (positive, negative, or equal to 0) a.) The football player kicks the ball in the air. The system includes the ball and the Earth b.) A board that…

Peter decided to rake the garden next to the house. He used a 3 kg shovel. On average, with one swing, he covers a square of soil 20 cm long, 15 cm wide and 30 cm deep. He raises the shovel with the soil by 40 cm (ie from the initial position of the soil: 15 cm below the soil surface, to the…

64. A 2.0-kg rock is initially at rest. The rock falls, and the potential energy of the rock-Earth system decreases by 407 J. How much kinetic energy does the system gain as the rock falls?

A 98.0-N sack of grain is hoisted to a storage room 50.0 m above the ground floor of a grain elevator. a. How much work was done? b. What is the increase in potential energy of a system containing the sack of grain and Earth? c. The rope being used to lift the sack of grain breaks just as the…

61. A ( 10.0-mathrm{kg} ) test rocket is fired vertically. When the engine stops firing, the rocket's kinetic energy is ( 1960 mathrm{~J} ). After the fuel is burned, to what additional height will the rocket rise?

Using a ruler, determine the scale used in the vector

Sketch the probability distribution for the ground state of a particle in a one-dimensional box with infinite barriers at the edges. Where is the most probable location according to quantum mechanics for a particle in the ground state of a one-dimensional box

An empty storage tank has a volume of 5280 ft. What is the buoyant force exerted on it by air ?

Two gliders with different masses move toward each other on a frictionless air track and undergo elastic collision. Find the velocity of each glider after the collision. (vAi = 2.0 m/s ; vBi= ?2.0 m/s ; mA= 0.50 kg ; mB = 0.30 kg) Answer: -1 m/s; 3 m/s

Two gliders with different masses move toward each other on a frictionless air track and undergo elastic collision. Find the velocity of each glider after the collision. (vA = 2.0 m/s ; vB = -2.0 m/s ; mA = 0.50 kg ; mB = 0.30 kg) Answer: -1 m/s; 3 m/s

What is the acceleration due to Earth’s gravity at a distance from the center of the Earth equal to the orbital radius of the Moon?

Calculate the escape speed of a rocket for the case of an Earth with twice its present mass.

Two logs with masses m1 and m2 are connected by a very light rope that goes through a very light pulley (see picture below). The friction in the pulley is negligible. The first log rests on a rough table, 2. log hangs over the edge of the table. ktr is the coefficient of friction between the…

The recommended daily intake for the average person is about 2200 calories. In 2014, the average American consumed about 3800 calories daily(a) With what average power would the average American have to work with in order to consume excess-daily calories? Consider 1 calorie = 4, 18J.(b) For how…

A torque of 72 N·m acts on a wheel with a moment of inertia of 162 kg·m2. If the wheel starts from rest, how long will it take to make 26 revolutions? Give your answer to 2 decimal places.

A torque of 72 N·m acts on a wheel with a moment of inertia of 162 kg·m2. If the wheel starts from rest, how long will it take to make 26 revolutions? Give your answer to 2 decimal places.

Two balls are hanging from each end of a massless rope. The green ball is pulled upward with constant force F = 120N. The blue ball starts from rest and descends 16 m in 6 seconds. Find the mass of both balls if the tension in the rope is 54N.

for each of the examples below, identify all the external forces acting on the system, and for each of these forces, write down what their work is (positive, negative, or equal to 0) a.) The football player kicks the ball in the air. The system includes the ball and the Earth b.) A board that…

Peter decided to rake the garden next to the house. He used a 3 kg shovel. On average, with one swing, he covers a square of soil 20 cm long, 15 cm wide and 30 cm deep. He raises the shovel with the soil by 40 cm (ie from the initial position of the soil: 15 cm below the soil surface, to the…

64. A 2.0-kg rock is initially at rest. The rock falls, and the potential energy of the rock-Earth system decreases by 407 J. How much kinetic energy does the system gain as the rock falls?

A 98.0-N sack of grain is hoisted to a storage room 50.0 m above the ground floor of a grain elevator. a. How much work was done? b. What is the increase in potential energy of a system containing the sack of grain and Earth? c. The rope being used to lift the sack of grain breaks just as the…

61. A ( 10.0-mathrm{kg} ) test rocket is fired vertically. When the engine stops firing, the rocket's kinetic energy is ( 1960 mathrm{~J} ). After the fuel is burned, to what additional height will the rocket rise?

Using a ruler, determine the scale used in the vector

Sketch the probability distribution for the ground state of a particle in a one-dimensional box with infinite barriers at the edges. Where is the most probable location according to quantum mechanics for a particle in the ground state of a one-dimensional box

An empty storage tank has a volume of 5280 ft. What is the buoyant force exerted on it by air ?

Two gliders with different masses move toward each other on a frictionless air track and undergo elastic collision. Find the velocity of each glider after the collision. (vAi = 2.0 m/s ; vBi= ?2.0 m/s ; mA= 0.50 kg ; mB = 0.30 kg) Answer: -1 m/s; 3 m/s

Two gliders with different masses move toward each other on a frictionless air track and undergo elastic collision. Find the velocity of each glider after the collision. (vA = 2.0 m/s ; vB = -2.0 m/s ; mA = 0.50 kg ; mB = 0.30 kg) Answer: -1 m/s; 3 m/s

What is the acceleration due to Earth’s gravity at a distance from the center of the Earth equal to the orbital radius of the Moon?

Calculate the escape speed of a rocket for the case of an Earth with twice its present mass.