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zorch, an arch enemy of superman, decides to slow earth's rotation to once per 27.0 h by exerting an opposing force at, How long must zorch push with this force to achieve his goal
a bus contains a 1740 kg wheel (a disk that has a .56 m radius) and has a total mass of 9600 kg. How high can the bus climb with this stored energy and still have a speed of 3.10 m/s at the top of the
a bicyclist of mass 54 kg puts all his weight on each downward-moving pedal as he pedals up a steep road. determine the magnitude of the maximum torque he exterts in the process
the velocity of an airplane is 50km/hr due north. the plane the plane flies into a cross wind of 50km/hr due east at a right angle
Compressed air can be pumped underground into huge caverns as a form of energy storage. how many homes could this internal energy serve for one day
Two long thin parallel wires 13.0 cm apart carry28-A currents in the same direction. Determine the magnetic field vector
A boy drags his 8.00 kg sled at constant speed up a 10.0 degree hill. He does so by pulling with a 40.0-N force on a massless rope attached to the sled. find the coefficient of kinetic friction betw
a rock is thrown downward from the top of a 40 m tower with an initial speed of 12 m/s. if g-9.8 m/s^2, what is the speed of the rock just before hitting the ground
A planet of mass m = 8.15 Ã? 1024 kg is orbiting in a circular path a star of mass M = 6.05 Ã? 1029 kg. What is the orbital period (in earth days) of the planet Tplanet
If 200 g of water is contained in a 300g aluminum calorimeter at 20°C and 20g of steam at 100°C is introduced into the calorimeter
A 0.500 kg length of copper wire is warmed 30.0°C by the passage of electrical current. How much heat was generated by the current flow
The equation of a transverse wave traveling along a very long string is given by y = 6.9 sin(0.025(pi)x + 4.5(pi)t), Determine the transverse displacement
A thin double convex lens is to focus the image of an object onto a screen so that the image is life-sized. What is the distance d from image to screen
Find the total power radiated out into space by the Sun assuming it to be at a temperature of 5500 K and the emissivity is 1
A double convex thin glass lens has equal radii of curvature. The focal length of the lens is +63.5 cm, find The index of refraction of the glass of the plano-convex lens
A fish appears to be 7.00 m below the surface of a pond when viewed almost directly above by a fisherman
A small earthquake starts a lamppost vibrating back and forth. find the time constant for the damping of the oscillation
A river narrows at a rapids from a width of 15m to a width of only 6.0m. The depth of the river before the rapids is 2.7m ; the depth in the rapids is 0.70m. Find the speed of water flowing in the r
An iron bolt is used to connect two iron plates together. The bolt must withstand shear forces up to about 3150 N. Calculate the minimum diameter for the bolt
A 22.5-kg rock is sliding on a rough, horizontal surface at 9.50 m/s and eventually stops due to friction. What average power is produced by friction as the rock stops
A spherical weather balloon is filled with hydrogen until its radius is 3.40 m, Find the buoyant force acting on the balloon, assuming the density of air is 1.29 kg/m3.
What is the acceleration due to gravity - The mass of the wire is negligible compared to the mass of the ball. Determine the acceleration due to gravity.
From the top of a 40.0m high cliff, two rocks are simultaneously thrown. One is thrown upwards at 20.0m/s, the other is thrown downwards at 8.0 m/s. How far apart are the two rocks after 1.5 seconds
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.65 104 m/s, What is the orbital speed of the second satellite
A pipe carrying 20°C water has a diameter of 2.4 cm. Estimate the maximum flow speed if the flow must be streamline