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What is its maximum range on level ground and what angle above the horizontal should it be fired to give maximum range?
The entire system is initially rotating at 0.180. Find the angular velocity if the child moves to a final position 1.10 from the center of the merry-go-round.
A candle is placed 12.0 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, the image moves 8.5 cm farther away from the mirror. Find the focal length of the con
You have a wire of length L = 2.2 m for making a square coil of a dc motor. The current in the coil is I = 1.0 A, and the magnetic field of the motor has a magnitude of B = 0.29 T. Find the maximum
With no heat lost to the surroundings. The sphere just passes through the ring at the equilibrium temperature. What is the final temperature.
A railroad car with a mass of 2.46 x 10^4 kg moving at 3.25 m/s collides and joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in t
AM radio signals are broadcast at frequencies between 545 kHz and 1595 kHz (kilohertz) and travel 3.0 108 m/s.(a) What is the range of wavelengths for these signals?
How many 95 W lightbulbs can you use in a 124 V circuit without tripping a 13 A circuit breaker? The bulbs are connected in parallel.
The 16.6 cm diameter disk rotates on an axle through its center. F1=19.2 N, F2=34.1 N, F3=34.1 N, F4=19.2 N, and d=4.73 cm. What is the net torque about the axle?
A non-uniform bar 5 meters has a center of gravity 1 meters from the heavy end. If it is placed on the edge of a block 1 meters from the light end and a weight of 1497 N is placed at the light end
You would like to eliminate the reflected light from a flat glass pane for perpendicularly incident light of wavelength 675 nm. If the index of refraction of the glass is 1.50 and you have a coatin
A gauge-12 wire has diameter centimeters and length meters. When the voltage volts is applied to the ends of the wire, the current is amperes. The concentration of free electrons in the wire is per
The ball strikes the floor at a speed of 7.9 m/s. What was the initial speed of the ball? Assume that air resistance is negligible.
A potter's wheel having a radius 0.53 m and a moment of inertia 14.8 kg·m2 is rotating freely at 52 rev/min. The potter can stop the wheel in 6.0 s by pressing a wet rag against the rim and
A piece of Nichrome wire has a radius of 5.50 10-4 m. It is used in a laboratory to make a heater that dissipates 3.00 102 W of power when connected to a voltage source of 120 V. Ignoring the effec
A hiker shouts toward a vertical cliff 465m away. The echo is heard 2.7s later. What is the speed of sound of the hikers voice in air?
A 1.6 kg rock initially at rest loses 408 J of potential energy while falling to the ground. Assume that air resistance is negligible. Calculate the kinetic energy that the rock gains while falling.
An ion accelerated through 240.00 V has its potential energy decreased by potential energy of 7.68 10-17 J. Calculate the (magnitude of the) charge on the ion.
An airplane traveling at v = 166 m/s emits a sound of frequency 5.50 kHz. At what frequency does a stationary listener hear the sound during each of the following times?
You slide a 325-N trunk up a 20.0° inclined plane with a constant velocity by exerting a force of 214 N parallel to the plane. What is the coefficient of friction?
A proton accelerates from rest in a uniform electric field of 587 N/C. At some time later, its speed is 2.34*10^6 m/s. What is the magnification of the acceleration of the proton?
At a ball game, consider a baseball of mass m = 0.15 kg that falls directly downward at a speed v = 40 m/s into the hands of a fan. What impulse Ft must be supplied to bring the ball to rest? If th
The bowstring exerts an average force of 75 N on the arrow over a distance of 78cm. Determine, using the work-energy theorem, the maximum speed reached by the arrow as it leaves the bow.
A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 549 N. As the drawing shows, she is closer to the left cliff than to the right cliff, with the
The proton strikes the negative plate at the same instant the electron strikes the positive plate. Ignore the attraction between the two particles, and find the initial speed of the proton.