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Calculate the work done by an 85kg man who pushes a crate4.00m up a ramp that makes an angle of 20° with the horizontal. He exerts a force of 500N on the crate parallel to the ramp and moves at a constant speed.
A 0.250-kg toy is undergoing SHM on the end of a horizontal spring with force constant k = 320 N/m. What is the amplitude of the motion
If the average molecular mass of compounds in food is 47.5, how many molecules are there in 1.00 kg of food, Find the ratio of ion pairs to molecules
In one day, a 75 kg mountain climber ascends from the 1400 m level on a vertical cliff to the top at 2380 m. find her change in gravitational potential energy on the second day
A man stands on the roof of a 13.0 {\rm m}-tall building and throws a rock with a velocity of magnitude 30.0 {\rm m}/{\rm s} at an angle of 30.0^\circ above the horizontal. Calculate the magnitude of the velocity of the rock just before it strikes ..
At a distance of 19 m from a sound source the intensity level is 98 dB. What is the intensity level (in dB) at a point 3.7 m from the source? Assume that the source radiates equally in all directions.
Two cars are traveling along a straight road. Car A maintains a constant speed of 65 km/h and car B maintains a constant speed of 94 km/h. At t = 0, car B is 43 km behind car A. How much farther will car A travel before car B overtakes it? (in km)
In preparation for an experiment that you will do in your introductory nuclear physics lab, you are shown the inside of a Geiger tube. Calculate the capacitance of your tube
After performing an experiment concerning charging a capacitor Sally noticed that the potential difference across the capacitor reached 2/3 of its final value after 18 seconds. find the time constant for the resistor-capacitor combination
A turboprop producing 1000 kW drives a propeller operating at 85% propulsive efficiency. If the fuel flow to the engine is 0.07 kg/s, determine the overall thermal efficiency of the engine.
A 1980-kg car is traveling with a speed of 18.5 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 43.8 m
If a nuclear power plant produces 1200 MW (Mega Watts) of electrical power and is 30% efficient, how much energy of fuel is consumed each day
Suppose 0.0450kg of steam (at 100.°C) is added to 0.450kg of water (initially at 20.5°C), Find the final temperature of the water after equilibrium is reached
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