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A gardener pushes a 20kg lawnmower whose handle is tilted up 37degrees above horizontal. The lawnmower's coefficient of rolling friction is 0.20. How much power does the gardener have to supply to push the lawnmower at a constant speed of 1.4m/s ? Assume his push is parallel to the handle.
A loudspeaker of mass 22 {rm kg} is suspended a distance of h = 2 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has the length of l = 3.90 {rm m}.
Two skaters, a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. Determine the acceleration (magnitude and direction) of the man
A square coil, enclosing an area with sides 2.7 cm long, is wrapped with 2,461 turns of wire. What average voltage is induced in the coil
The two angled ropes used to support the crate in the figure below an withstand a maximum tension of1400Nbefore they break. What is the largest mass the ropes can support
A tennis ball is struck at the base line of the court, 12.5 m from the net. How far beyond the net will the ball hit the ground
A boy is standing on a frozen lake (i.e. no friction) holding a rope that is attached to his sled. He pulls on the rope and exerts a horizontal force of 5.2 N, What is the acceleration of the boy
When a 0.31-kg mass is attached to a vertical spring, the spring stretches by 15 cm. How much mass (total) must be attached to the spring to result in a 0.53-s period of oscillation
If the shortest wavelength produced by an x-ray tube is 0.441 nm, what is the voltage applied to the tube
One mole of helium atoms has a mass of 4 grams. If a helium atom in a balloon has a kinetic energy of 1.224e-21 J, what is the speed of the helium atom
The small piston of a hydraulic lift has a cross-sectional area of 3.30 cm2, and its large piston has a cross-sectional area of 197 cm2. What downward force of magnitude F1 must be applied to the small piston for the lift to raise a load whose weight..
A starship lands on a planet of mass 6*10^23 kg. An astronaut throws a rock of mass 9.5 kg up from the ground at 17 m/s. what is the gravitational acceleration on the rock
Derive an equation for specific gravity in terms of the ry sample weight and the apparently lighter submerged weight, Calulate the specific gravity of each sample
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