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which of the following represents work: A compressed spring that is allowed to expand. The normal force on a stationary crate. The frictional force on a crate that is being pushed across a flat floor. The weight of a ball that rolls, without slipping, on a flat surface. A stretched spring that is allowed to contract. The reaction force on a pin support. The weight of a ball that rolls, without slipping, down a ramp. The frictional force on a crate sliding down a ramp.
A Cessna aircraft has a liftoff speed of 120 km/h. How long does it take the aircraft to become airborne
he electric field in a particular region of space is found to be uniform, What is the change in electric potential energy of a charge q = 6.7 uC if it is moved from (x, y) = (20 cm, 45 cm) to (5 cm, 30 cm)
A loop of 50 turns and 40cm^(2) rotates with angular velocity of 300 turns per minute normal to a magnetic field of 0.5 T
the earth takes slightly less than one day to complete one rotation about the axis passing through its poles. what is the angular speed of the earth about its axis
Esitmate the change in temperature of 5 m^3 of air, to an increase in pressure of 50 kPa. The initial temperature of the air is 15*C at atmospheric pressure
A current of 14.0 mA is maintained in a single circular loop of 3.80 m circumference. A magnetic field of 0.610 T is directed parallel to the plane of the loop. (a) Calculate the magnetic moment of the loop. Please have answer in mA · m2
An object is placed 53.0 cm from a screen. Find the magnification of the lensmagnification if placed at the shorter distance magnification if placed at the farther distance
An undiscovered planet, many lightyears from Earth, has one moon in a periodic orbit. This moon takes 21.0 days on average to complete one nearly circular revolution around the unnamed planet.
What is an acceleration of the particle at the instant
A ball with a radius of 10cm falls through the air toward the ground. what is the maximum speed it will obtain while falling
A 60.0-kg skier with an initial speed of 12.0 m/s coasts up a 2.50-m-high rise as shown in Figure 8. Find her final speed at the top
A cylinder of mass 8.0 kg rolls without slipping on a horizontal surface. At a certain instant its center of mass has a speed of 11.0 m/s. Determine the translational kinetic energy of its center of mass
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