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Styrofoam has a density of 300 kg/m^3 . What is the maximum mass that can hang without sinking from a 20.0cm -diameter Styrofoam sphere in water? Assume the volume of the mass is negligible compared to that of the sphere.
Four equal charges of +2.5×10-6 C are placed on the corners of one face of a cube of edge length 15.0 cm. A charge of -2.5×10-6 C is placed at the center of the cube. What is the magnitude of the force on the charge at the center of the cube?
At one instant a bicyclist is 50 m due east of a park's flagpole, going due south with a speed of 9 m/s. Then, 24 s later, the cyclist is 45 m due north of the flagpole, going due east with a speed of 20 m/s. For the cyclist in this 24 s interval,..
An 88 kg spacewalking astronaut pushes off a 640kg satellite, exerting a 640N force for the 0.60 s it takes him to straighten his arms.
The ball is 21.9 m from the goal post. The ball is kicked with an initial velocity of 19.8 m/s at an angle θ above ground. Between what two angles, θ1 and θ2, will the ball clear the 2.74m high crossbar.
How much work did the movers do pushing a 160 kg crate 10.3 m across a rough floor without acceleration, if the effective coefficient of friction was 0.50.
Two ants race across a table 62 cm long. One travels at 4.77 cm/s and the other at 2 cm/s. When the first one crosses the finish line, how far behind is second one. What am I trying to solve for distance, speed, or time.
A uniform plank of length 4.7m and weight 204 N rests horizontally on two supports, with 1.1 m of plank hanging over the right support. To what distance x can a person who weighs 445N walk on the overhanging part of the plank before it just begins ..
A cable is used to raise a 29kg urn from an underwater archeological site. There is a 21 N drag force from the water as the urn is raised at a constant speed.
Two particles of masses m and 3.00m are moving toward each other along the x-axis with the same speed v. They undergo a head on elastic collision and rebound along the x- axis. Find out the final speed of the heavier object.
A small immersion heater is rated at 350 W. Estimate how long it would take a heat a cup of soup (assume this is 250 mL of water) from 20C to 60C.
A spherical steel shell with shell thickness 10 mm rolling down the ramp without slipping.assume that the density of aluminum.
The third floor of a house is 6.00 m above street level. How much work is essential to move a 159 kg refrigerator to the third floor.
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