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A projectile is fired horizontally from a gun that is 38.0 m above flat ground, emerging from the gun with a speed of 390 m/s. (a) How long does the projectile remain in the air?
a meter stick with a mass of 89.5 g is being supported at the 50.0 cm mark with a pivot that is 1.00 cm above the center of mass of the meter stick. The moment of inertia of the stick about that poi
The space between the plates is then filled with a dielectric material, with dielectric constant K= 5.07. What must the magnitude of the charge on each capacitor plate now be, to produce the same po
A 0.135-kg ball, moving in the positive direction at 14 m/s, is acted on by the impulse shown in the graph below. What is the ball's speed at 4.0 s?
A 61-kg skier is going down a slope oriented 32° above the horizontal. The area of each ski in contact with the snow is 0.13 m2. Determine the pressure that each ski exerts on the snow.
Find the potential difference V1 - V2. Point 1 is at the center of the plastic sphere, and point 2 is just outside the sphere.
A potter's wheel having a radius 0.47 m and a moment of inertia 10.9 kg·m2 is rotating freely at 46 rev/min. The potter can stop the wheel in 7.0 s by pressing a wet rag against the rim and
A dry cell does 7.5. J of work through chemical energy transfer 5.00 C between terminals of the cell. What is the electric potential between the two terminals?
A see saw is made of a uniform board 2.6 m long. A girl weighing 440 N sits on the left end, and a boy weighing 640 N sits on the right end. The see saw is balanced when the board is pivoted 1.1 m
A force of 70 N exerted at an angle of 30 degrees below the horizontal on a block of mass 8 kg that is resting on a table. What is the magnitude of the net force on the block in the x direction if t
A 1.4 kg block is attached to a horizontal spring with spring constant 2800N/m. The block is at rest on a frictionless surface. A 8.90g bullet is fired into the block, in the face opposite the spri
A material contains 50.0 grams of carbon 14, and is 300,000 years old. It has a half life of 5730 years. What was its original mass?
A steel tank contains a large quantity of compressed air. When the tank is submerged for an hour in a cold-water tank, the air loses 245 J of heat to the water. What is the change in the internal e
A 1250kg is pulling a 325kg trailer. Together the car and trailer have an acceleration of 2.15m/s squared. Determine the net force on the car-trailer combination.
An outfielder throws a 0.150 kg baseball at a speed of 39.6 m/s and an initial angle of 34.0° What is the kinetic energy of the baseball at the highest point of its trajectory?
A pebble is dropped down a well and hits the water 1.1s later. Using the equations for motion with constant acceleration, determine the distance from the edge of the well to the water's surface.
A 62 kg boy and a 45 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 3.3 m/s2, determine the magnitude of
Calculate the amount of work (in electron-volts) it would take to move an electron from 11.6 to 13.4 away from a +3.50 point charge.
Two identical loudspeakers are 3.2 m apart. A person stands 5 m from one speaker and 4.2 m from the other. What is the lowest frequency at which destructive interference will occur at this point? Th
Three resistors with a resistance of 12 ohms, 8 ohms, and 24 ohms are in a series circuit with a 12 volt battery.
A 140 g disk sits on a horizontally rotating turntable. The turntable makes exactly 3 revolutions each second. The disk is located 8 cm from the axis of rotation of the turntable.
A 394 kg mass is brought close to a second mass of 138 kg on a frictional surface with coefficient of friction 0.6. At what distance will the second mass begin to slide toward the first mass? The a
"Write a one page essay discussing common household items (chemicals) that you would expect to find inside a cell
A light bulb with a resistance of 10.0 coulomb allows a 1.20 A current to flow when connected to a battery. (a)What is the voltage of the battery? (b) What is the power of the light bulb?
Consider a supertanker, with a mass of 2.4*10^8 kg. If it is pushed by a rocket motor (thrust force of 5.0*10^6 N) and is subject to no other forces, what will be the magnitude of its acceleration?