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A sign hangs from a beam supported by a rope attached to a wall. The beam is 4 meterslong. The sign weight 1 kg.
a. Find the tension in the rope.
A flywheel rotates with an angular speed of 22 rev/s . As it is brought to rest with a constant acceleration, it turns 46 rev. What is the magnitude of the angular acceleration
A diesel engine performs 2200J of mechanical work and discards 4300J of heat each cycle. A) How much heat must be supplied to the engine in each cycle? B) What is the thermal efficiency of the engine?
A bomb is dropped from an airplane in level flight at a speed of 970 km/h. The altitude of the aircraft is 2000 m. At what horizontal distance from the initial position of the aircraft will the bomb land.
A 1.83 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.442 and the coefficient of kinetic friction is 0.240. How much force is needed to begin moving the book
A baseball is thrown upwards at a 45o angle with respect to the ground. Its initial speed is 25 meter per second. Determine how high above its starting point will it reach
a 35.0 cm diameter coil consists of 30 turns of circular copper wire 2.0 mm in diameter. a uniform magnetic field
A 3 kg toy car with a speed of 5 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 5 m/s, how much kinetic energy is lost
An object is placed 40cm in front of a concave mirror whose radius of curvature is 30am. Determine the location of the image and the magnification
A hollow spherical conductor, carrying a net charge +Q, has inner radius r[1] and outer radius r[2] = 2r[1]. At the center of the sphere is a point charge +Q/2. (a) Write the electric field strength E in all three regions as a function of r.
A photon of wavelength 0.91000 nm strikesa free electron that is initially at rest. The photon is scattered straight backward. What is the speed of the recoil electron after the collision
You are standing 5 m from a tractor when the operator starts it ip the intensity is 3 x10^-5 W/m^2. How much did the sound level change
The surface temperature of Star Y is 8100 K and the power output of the star is 5.30E+27 W. what will the new power output be
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