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A person removes a 10.5 kg stereo amplifier from a shelf that is 1.82 m high. The amplifier is lowered at a constant speed to a height of 0.75 m.
Find by integration its moment of inertia about an axis perpencicular to the rod at its center of mass.
A 1.0x10^-3 kg spider is hanging vertically by a thread that has a Young's modulus of 4.5x10^9 N/m^2 and a radius of 13x 10^-6.
If the object barely floats, with the top surface ot the wood level with the surface of the water, find the ratio of the volumes, Vw/Va.
Assuming the block slides back down the plane, how fast will it be going when it returns to the bottom?
The generator at a power plant produces AC at 24,000 Volts. A transformer steps this up to 345,000 Volts for transmission over power lines.
A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.190 and the push imparts.
If the block, after coming to rest at B, slipped along BC, what is the velocity at C. ignore the friction along the surface BC and assume the bottom.
On a frozen pond, a 10.6 kg sled is given a kick that imparts to it an initial speed of V(0) = 1.73 m/s.
A 276 kg piano slides 4.02 m down a 30.2° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline.
A simplified representation of the diesel cycle, with just air as the working substance. Show that the efficiency of the engine is:
A car can accelerate from rest to 25 m/sec in 12 seconds on a level road. The weight of the car is 10,000 newtons.
The initial speed of the skier is 6.6 m/s. After coasting a distance of 1.9 m up the slope, the speed of the skier is 4.4 m/s.
Compute the electric field, in both components and as magnitude and direction, at the midpoint between the two hanging masses.
What minimum strength is needed for a line that is to stop a salmon of weight 85 N in 8.0 cm if the fish is initially drifting at 2.5 m/s?
What is the speed of the block just before it hits the spring? (Assume that friction is negligible.) (in m/s)
If the skier has a mass of 60kg and the force of friction retards his motion by doing 2500 j of work, what is his speed at the bottom of the slope?
The Maxwell-Boltzmann distribution of velocities v for a unit volume of an ideal gas can be written in the form
If the gravitational potential energy U of the rock-Earth system is zero at the bottom of the hill, what is the value of U just before the slide?
Assuming that the ball is always thrown at the same initial speed, at what angle should the outfielder throw the ball to make it go the same distance D.
A projectile is given a vertical upward velocity Vo = 10000 m/sec at Earth's surface. Neglect air friction.
A patient is to receive an intravenous injection of medication. In order to work properly, the pressure of fluid containing the medication.
Consider two spin systems A and A' placed in an external field H. System A consist of N weakly interacting localized particles of spin 1/2 and magntic moment u
If 3.75 X 10^-4 J of work are required to move 13.7 microc of charge from one point to another, what is the electric potentail difference the two points.
Designing a roler coaster is very tricky. Patrons of theme and amusement parks want to be thrilled , but generally do not want to be injured.