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An outfielder throws a 0.150 kg baseball at a speed of 56.0 m/s and an initial angle of 30.0°. What is the kinetic energy of the ball at the highest point of its motion?
Sam, whose mass is 78.0 kg, takes off down a 52.0 m high, 8.00^circ slope on his jet-powered skis. The skis have a thrust of 220 N. Sam's speed at the bottom is 45.0 {rm m/s}. What is the coefficie
A student has two ramps, both of which are at an angle 34°. Ramp 1 is frictionless and ramp 2 has friction. The student also has two blocks, one for each ramp. She pushes the blocks up the ramps
How much heat is required to melt 11 percent of a 3.20×105 metric-ton iceberg? One metric ton is equal to 103 kg. Assume that the iceberg is at 0°C.
A thin 2.5kg box rests on a 5.5kg board that hangs over the end of a table. The portion of the board on the table measures .30m and the portion of the table measures .20m. How far can the center of
A crate is pulled to the right(positive x axis) with a force of 82.0 N, to the left with a force of 115 N, upward with a force of 565 N, and downward with a force of 236 N. Find the magnitude and di
The kinetic energy of the can andd. the gravitational potential energy of the can-earth system 0.200s before the can reaches the ground?
A small, 300 g cart is moving at 1.50 m/s on an air track when it collides with a larger, 2.00 kg cart at rest. After the collision, the small cart recoils at 0.890 m/s. What is the speed of the lar
A rifle is aimed horizontally at a target 45m away. The bullet hits the target 1.5cm below the aim point. what is the time takes and the speed?
At a distance of 4.32 m from a siren, the sound intensity is 3.75 x 10-2 W/m2. Assuming that the siren radiates sound uniformly in all directions, find the total power radiated.
What minimum force (assumed constant) is needed from the catapult that is used to help launch the jet? Assume that the catapult and the jet's engine each exert a constant force over the 88.9 m dista
Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons. (a) How many electrons are there in 3.80 liters of water? (1 liter is equivalent to 1.00 x 10-3 m3) (b) What
A small city requires about 17 of power. Suppose that instead of using high-voltage lines to supply the power, the power is delivered at 120 .Assuming a two-wire line of 0.40 -diameter copper wire,
What is the force vec F on the 1.0{rm nC} charge in the middle of the figure due to the four other charges? Give your answer in component form.
The coefficient of kinetic friction between the 50-kg block and incline is 0.250. Determine the change in the kinetic energy of the 50-kg block as it moves from A to B, a distance of 20.0 m.
A 0.33 kg block is located 0.20 m from the center of a turntable. The coefficient of static friction between the block and the surface of the turntable is 0.44. Calculate the maximum angular speed t
The bar has mass 60.0 and is 100 in length. The bug jumps off in the horizontal direction, perpendicular to the bar, with a speed of 15.0 relative to the table.
It exhausts the propellant in a 20-s "burn." The rocket moves at 150 m/s after the burn. What average force is experienced by the rocket during the burn?
Three equal point charges, each with charge 1.50 , are placed at the vertices of an equilateral triangle whose sides are of length 0.550 . What is the electric potential energy of the system? (Take
A 60-kg boy and a 40kg girl use an elastic rope while engaging in a tug-o war on an icy frictionless surface. if the acceleration of the girl towards the boy is 3/0m/s squared determing the magnitud
In unit-vector notation, what is the net magnetic field B at the origin? At what value of y does B = 0? (c) If the current in the wire 1 is reserved, at what value of y does B = 0?"
What is the lift (in newtons) due to Bernoulli's principle on a wing of area 88 m2 if the air passes over the top and bottom surfaces at speeds of 280 m/s and 150 m/s, respectively?
An electron accelerated from rest through a voltage of 450 V enters a region of constant magnetic field. If the electron follows a circular path with a radius of 22 cm, what is the magnitude of the
An opera singer in a convertible sings a note at 600hz while cruising down the highway at 81km/h. The speed of sound n the air is 343m/s. What is the frequency heard by a person standing beside the
While attempting to tune the note C at 517 Hz, a piano tuner hears 6 beats/s between a reference oscillator and the string. What are the possible frequencies of the string?