Mindblown: a blog about philosophy.
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A lever is used to lift a heavy rock that weighs 1000 newtons.
A lever is used to lift a heavy rock that weighs 1000 newtons. When a 50-newton force pushes one end of the lever down 1 meter, how far does the load rise?
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An elevator lifts a 500 kg load up a distance of 10 meters in 8 seconds.
An elevator lifts a 500 kg load up a distance of 10 meters in 8 seconds. a. Calculate the work done by the elevator. b. Calculate the elevator’s power.
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Sal has a weight of 500 N. How many joules of work has Sal done against gravity when he reaches 4 meters high on a rock climbing wall?
Sal has a weight of 500 N. How many joules of work has Sal done against gravity when he reaches 4 meters high on a rock climbing wall?
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Your neighbor’s car breaks down. You and a friend agree to push it two blocks to a repair shop while your neighbor steers.
Your neighbor’s car breaks down. You and a friend agree to push it two blocks to a repair shop while your neighbor steers. The two of you apply a net force of 800 newtons to the 1000-kilogram car for 10 seconds. …
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A demolition derby is a car-crashing contest. Suppose an 800-kg car moving at 20 m/sec crashes into the back of and sticks to a 1200-kg car moving at 10 m/sec in the same direction.
A demolition derby is a car-crashing contest. Suppose an 800-kg car moving at 20 m/sec crashes into the back of and sticks to a 1200-kg car moving at 10 m/sec in the same direction. a. Is this collision elastic or inelastic? Why? b. Calculate the momentum of each car before the collision. c. What is…
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A 1000-kg car uses a braking force of 10,000 N to stop in 2 seconds.
A 1000-kg car uses a braking force of 10,000 N to stop in 2 seconds. a. What impulse acts on the car? b. What is the change in momentum of the car? c. What was the initial speed of the car?
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A 2-kilogram ball is accelerated from rest to a speed of 8 m/sec.
A 2-kilogram ball is accelerated from rest to a speed of 8 m/sec. a. What is the ball’s change in momentum? b. What is the impulse? c. A constant force of 32 newtons is used to change the momentum. For how much time does the force act?
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Draw a speed vs. time graph for a car that starts at rest and steadily accelerates until it is moving at 40 m/sec after 20 seconds.
Draw a speed vs. time graph for a car that starts at rest and steadily accelerates until it is moving at 40 m/sec after 20 seconds. Then calculate the car’s acceleration and the distance it traveled during the 20 seconds.
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Determine your average walking speed. How long would it take you to walk 2,462 miles (3,962 km) from New York to Los Angeles?
Determine your average walking speed. How long would it take you to walk 2,462 miles (3,962 km) from New York to Los Angeles?
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Given a ruler, a stopwatch, a tennis ball, a 1-meter long piece of string, a rubber band, tape, and 10 pieces of paper, design an experiment.
Given a ruler, a stopwatch, a tennis ball, a 1-meter long piece of string, a rubber band, tape, and 10 pieces of paper, design an experiment. List a question, a hypothesis, the independent variable, the dependent variable, the control variables, and the procedure for your experiment
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