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How efficient is a heat engine that takes in 5.7 Joules of heat and does 3 Joules of work on its environment? Express your result as a decimal number (e.g., use 0.33 instead of 33%).
A car moving initially at 20m/s comes gradually to stop in 400m. What was the acceleration of the car?
Sodium ions (Na+) move at 0.861 m/s through a bloodstream in the arm of a person standing near a large magnet. what would be the magnetic force on the arm
a charge of 22.5 microc is located at 4.40m 6.22m and a charge of -10.1microc is located at - 4.50m6.75m. what
A system consists of two particles. Particle 1 with mass 2.0 kg is located at (2.0 m, 6.0 m) and has a velocity of (2.6 m/s, 4.1 m/s). find the position and the velocity of the center of mass of the system
A 795 kg car moving at 26 m/s brakes to a stop. The brakes contain about 15 kg of iron, that absorbs the energy. What is the increase in temperature of the brakes.
the star vega has a measured angular diameter of 3.24 mas milliarcseconds and a flux of 2.84 x 10-8 wm2. its distance
The moon's mass is 7.4 x 10^22kg and it orbits 3.8 x 10^8m from the earth. What is the angular momentum of the moon around the earth
A modern sculpture has a large horizontal spring, with a spring constant of 274 N/m, By how much has the spring stretched
A bird, starting from its nest (we'll call that the origin), flies 24.0 km due southeast. It then changes directions and flies 26.0 km in a direction 60° north of east. Find the magnitude and direction of its resultant displacement.
A brick of mass M sits on a rubber pillow of mass m . Together they are sliding to the right at constant velocity on an ice-covered parking lot, Draw a free-body diagram of the brick and identify each force acting on it
A stone is thrown from the top of a cliff 150 m above the ground, What is the speed (magnitude of velocity) of the stone when it hits the ground
When an object such as a plastic comb is charged by rubbing it with a cloth, If that charge is 3.4 µC, by what percentage does the mass of a 35g comb change during charging
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