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You (mass 80 kg) and your friend (mass unknown) are in a rowboard (mass 60 kg) on a calm lake. You are at the center of the boat rowing and she is at the back, 2 m from the center. You get tired and stop rowing. She offers to row and after the boat comes to rest, you change places. You notice that after changing places the boat has moved 20 cm relative to a fixed log. What is your frriend's mass?
A light stick with two masses attached to it is spinning about its center at 5 revolutions per minute. The length of the stick is 2.5 meters and the masses are 1.5 kg each.
A system consisting of two positive particles is altered by an outside force so that its potential energy increases by 5.4 ?J. What is the work done by the outside force
An astronomical telescope has an angular magnification of -144, What is the focal length of the eyepiece
A constant force of 25 N is applied as shown to a block which undergoes a displacement of 7.5 m to the right along a frictionless surface while the force acts. What is the work done by the force
In figure, a ball is thrown up onto a roof, landing some timelater at height h = 20.0 m above and d = 30.0 mhorizontally from the release point. The ball's path just beforelanding is angled at θ = 60.0o with the horizontal roof. (a)Find the time o..
A 910 kg sports car collides into the rear end of a 2200 kg SUV stopped at a red light. calculates the speed of the sports car at impact
An athlete crosses a 29 m wide river by swimming perpendicular to the water current at a speed of 0.6 m/s relative to the water. How fast is the water flowing relative to the ground
Estimate the terminal speed of a wooden sphere (density 0.810 g/cm3) falling through air, if its radius is 8.00 cm and its drag coefficient is 0.500. (The density of air is 1.20 kg/m3.)
Apartment dweller will testify that bass notes are more distincty heard from music played in nearby apartments. Why do you supposelower frequency sound get through walls floors and ceiling moreeasily?
When a spacecraft travels from Earth to the Moon, the gravitational force from Earth initially opposes this journey. How far from Earth must the spacecraft be for the gravitational forces from the Moon and Earth to just cancel
The absorber surface of a solar collector is made of aluminum coated with black chrome a s = 0.87 and e ir = 0.09). Solar radiation is incident on the surface at the rate of 600 W/m2. The air and the effective sky temperature are 25 and 15°C respe..
A football is kicked straight up into the air and it hits theground 3.8 seconds later. What is the greatest height reached by the ball (assume itwas kicked at ground level)?
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