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A 3250 kg open railroad car coasts along with a constant speed of 10.6m/s on a level track. Snow begins to fall vertically and fills the car at a rate of 3.40kg/min gnoring friction with the tracks
A well-insulated electric water heater delivers 3.10*106cal to its tank of water in 35.0 minutes. Find the resistance of its heating element, which is connected across a 120V potential difference.
Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. Why does the car's mass not matter?
As a 15000 kg jet plane lands on an aircraft carrier, its tail hook snags a cable to slow it down. The cable is attached to a spring with spring constant 60000 N/m. If the spring stretches 30 m to
(a) How much work is done to bring this wheel from rest to a speed of 118 rpm in a time interval of 26.0 s? (b) What is the applied torque on the flywheel (assumed constant)?
One section, having a mass of 4.60×105, is blown straight backward with a speed of 2.20×106. A second piece, with mass 7.80×105, continues forward at 1.30×106. What is the spee
The power consumption in watts is given by P=IV, where P is the power used, I is the current, and V the voltage. How much current, in Amps, will flow from the power supply?
Find the resultant gravitational force exerted by the other two objects on the object at the origin
(a) Find the rod's kinetic energy at its lowest position (in Joules) (b) Find how far above that position the center of mass rises. (in meters)
What is the instantaneous angular velocity of the disk at the end of the 8.0 s? (in radians/sec) (d) Assuming that the acceleration does not change, through what additional angle will the disk turn
A 10-turn square coil 0.50 m on a side lies in the xy-plane. A uniform magnetic field with magnitude 1.0 T in the negative z-direction changes steadily to 3.0 T in the positive z-direction, a proces
Use conservation of energy to find the spring constant of the piston if they fall 64m, 40m of which the piston is pushing up on the platform, with 50% losses to heat the air in the piston. There wil
A meter stick is held vertically with one end on the floor and is then allowed to fall. Find the speed of the other end when it hits the floor, assuming that the end on the floor does not slip. (Hin
A good baseball pitcher can throw a baseball toward home plate at 83 mi/h with a spin of 1625 rev/min. How many revolutions does the baseball make on its way to home plate? For simplicity, assume th
A person is to be fitted with bifocals. She can see clearly when the object is between 30 cm and 1.5 m from the eye. Assume that the glasses will be worn so that the lenses are 2.0 cm from her eyes.
(a) Find the rod's kinetic energy at its lowest position (b) Find how far above that position the center of mass rises.
Find the maximum angular velocity of the cylinder, i.e. just as the spring contracts back to its equilibrium length.
A uniform 30 kg ladder (length = 8.50 m) leans against a smooth vertical wall. The base of the ladder is 12 ft from the wall. If the coefficient of friction between the ground and the ladder is 0.15
What is the potential difference between electrodes? Express your answer using two significant figures.
A 2340 kg satellite used in a cellular telephone network is in a circular orbit at a height of 770km above the surface of the earth. What is the gravitational force on the satellite?What fraction is
the radius and height of the reactor as functions of the buckling so that the volume of the critical reactor is a minimum;
Calculate the concentrations in grams per liter of 235-U, 233-U, and 239-Pu required for criticality of infinite homogeneous mixtures of these fuels and the following moderators:
Charges q, q, and -q are placed on the x-axis of x=0, x=2m, and x=4m respectively. At which of the following points does the electric field have the greatest magnitude a) x = 1m b) x = 3m c) x = 5m
Express your answer with the appropriate units. What's the direction of the velocity of the third piece? Count counterclockwise from the x axis.
One possibility would be, r, (phi) and (alpha), where r and (phi) specify the position of the rod's CM relative to an origin half way between the springs on the ceiling, and (alpha) is the angle of