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1. Work of at least 2000J is required to push a crate up a frictionless incline. If the crate is pushed 20m on the incline and the crate is 20 kg then what is the slope of the incline?
A) 45° B) 90° C) 60° D)30°
2. The kinetic energy of a spring is 100J when compressed by 10cm. What is its spring constant?
A) 10N/cm B) 20 J/cm C) 20000 N/m D) 2000 N/m
3. A plastic cylinder has 20 cm of 750 kg/m 3 oil on top of30 cm of water. Assuming the mass of the plastic cylinder is in important, how high is the center of mass of this container of fluid.
A) 16.66 cm B) 23.33cm C) 30 cm D) 31.67cm
A uniform 8.25m , 1750 kg beam is hinged to a wall and supported by a thin cable attached 2.00m from the free end of the beam, How hard does the beam push inward on the wall
A 7 kg ball has a velocity of 16 m/s. How much work would be required to stop the ball
How much time is neccesary to stop the crate. A block with mass m = 5.5 kg slides down an inclined plane of slope angle 10.9 ° with a constant velocity. It is then projected up the same plane with the initial speed 3.85 m/s. How far up the incline ..
A thin stick of mass M = 4.3 kg and length L= 1.7 m is hinged at the top. A piece of clay, mass m =0.7 kg and velocity V = 4.0 m/s hits the stick a distance x = 1.00 m from the sticks and hinge to it. What is the angular velocity of the stick immedia..
An airplane has a mass of 20,000 kg and takes off under the control of a constant net force of 30,000 N. What is the net force that acts on the plane's 73 kg pilot.
When a car's starter is in use, it draws a large current. The car'slights draw much less current. As a certain car is starting, thecurrent through the battery is 61.8 A and the potential difference across the battery terminals is8.91 V.
The Concorde is 62 m long when its temperature is 23°C. In flight, the outer skin of this supersonic aircraft can reach 106°C due to air friction. Find the amount by which the Concorde expands
An unstable particle with a mass equal to 3.34 10-27 kg is initially at rest. Find the masses of the fragments
two horizontal forces and are acting on a box but only is shown in the drawing. can point either to the right or to
an electric dipole consists of 3e charge and a -3e charge that are a fixed distance apart. when the 3e charge located
a solenoid 1.40 m long and 2.50 cm in diameter carries a current of 18.0 A. Find the length of the wire forming the solenoid
A sample of a gas occupies 5.25 m^3 at an absolute pressure of 1.00atm & temp of 20 degrees C: calculate the pressure in the gas sample if the volume is held at 5.25 m^3 while the temp is lowered to negative 40 degrees C
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