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A 62.5 kg person holding two 0.800 kg bricks stands on a 2.15 kgskateboard. Initially, the skateboard and the person are at rest.The person now throws the two bricks one at a time, so that theirspeed relative to the person is 17.7 m/s. What is the final speed of the person and theskateboard relative to the ground?
An uncharged metal slab has square faces with 12 cm sides. It is placed in an external electricfield that is perpendicular to its faces. The total charge inducedon one of the faces is 1.2 nC. What isthe magnitude of the electric field?
A box is pushed across the floor, slide with a constant velocity, and is opposed by a friction force of 25N. What is the magnitude of the force? Choose the correct answer. A.Less than 25N B.Zero C.Greater than 25N D.25n
What is an average speed for the new trip
A 140 g, 90.0 mph fastball comes across the plate very nearly horizontally and is batted at 90.0 mph at a 30.0 degree angle (above the horizontal) toward center field. Determine the impulse (in N's) acting on the ball
Two parallel planes have surface charge densities +5.0 nC/m2 and -3.0 nC/m2. What is the magnitude of the electric field between them
A flat uniform circular disk (radius = 5.00 m, mass = 390 kg) isinitially stationary. Find the resulting angular speed(in rad/s) of the disk
At rush hour, the noise from a highway is 10?4 W/m2 with 100 cars passing a given point a minute. At night the average noise is reduced to 10?6 W/m2. How many cars are now driving on the highway?
A golf ball is struck at ground level. The speed of the golf ball as a function of time is shown in the figure below, where t = 0 at the instant the ball is struck. What is the maximum height above the ground level attained by the ball
A 0.250 block moving vertically upward collides with a light vertical spring and compresses it 4.00 before coming to rest. If the spring constant is 53.0 , what was the initial speed of the block? (Ignore energy losses to sound and other factors d..
A laser beam of unknown wavelength passes through a diffraction grating having 5510lines/cmafter striking it perpendicularly. At what angle will the next pair of bright spots occur
A long straight wire suspended in the air carries a conventional current of 8.2 amperes in the ?x direction, What is the (vector) magnetic field due to the wire at the location of the electron
Coulomb's Law gives us an expression for the electric field caused by a point charge with magnitude . Suppose we have several point charges. The electric field at a location is the vector sum of point charge contributions.
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