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A 3.8 kg box is sliding down a surface that is inclined downwards by 30° below the horizontal. Initially the box is at rest, and after sliding down by a distance of 1 m along the surface the box reaches the level floor. When the box just reached the level floor, the speed of the box is measured to be 0.8 m/s. How much energy of the box has been lost (dissipated) by the friction?
Find the speed of a satellite in a circular orbit around the earth with a radius 4.01 times the mean radius of the earth; RE 6.37E+3km; ME 5.98E+24kg
a snowboarder has a mass of 70 kg and is being carried by a lift. The lift has a constant inclination of 30o, what power must the motor produce to achieve the task
A 550 N physics student stands on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 450N. (a) Find the acceleration of the elevator. Find the mass of the worker.
24.0g of copper pellets are removed from a 300 ? C oven and immediately dropped into 120mL of water at 24.0 ? C in an insulated cup. What will the new water temperature be
A long, straight wire carries a current I1 = 3.5 A and is a distance h =15 cm from a rectangular current loop that carries a current I2 = 1.5 A. What is the force exerted by the current loop on the wire
In a slow-pitch softball game, a 0.200-kg softball crosses the plate at 20.0 m/s at an angle of 40.0° below the horizontal. Determine the impulse delivered to the ball
At a factory, a noon whistle is sounding with a frequency of 480-Hz. As a car travelling at 79 km/h approaches the factory, the driver hears the whistle at frequency fi. After driving past the factory.
A 70.0 kg circus performer slides 4.90m down a pole to the circus floor, starting from rest. What is the kinetic energy of the performer as she reaches the floor if the frictional force on her from the pole (a) is negligible (she will be hurt) and (b..
what is the maximum speed the ball can have. imagine there are no other forces acting on the particle.
Light at wavelength 589 nm from a sodium lamp is incident perpendicularly on a grating with 40900 rulings over width 82 mm
Explain the spacing between allowed vibrational energy levels
A 1.0-kg block of ice is initially at 0°C. Heat is added to this system, and the entropy is increased by 357.1 J/K. How much of the ice melts
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