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A grinding wheel is spun up to a speed by a motor that produces constant power. It takes time t to reach an angular velocity w. Assuming negligible friction at the axle, how long does it take to re
A solid cylindrical disk has a radius of 0.13 m. It is mounted to an axle that is perpendicular to the circular end of the disk at its center. When a 50-N force is applied tangentially to the disk,
What distance does the car cover in the first 4 seconds and the last 2 seconds of motion? What is the constant speed V that characterizes the middle portion of its motion?
How many 92 W lightbulbs can you use in a 130 V circuit without tripping a 17 A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each lightbul
A boat heading due North crosses a 168-m wide river with a speed of 10.0 km/h relative to the water. The water in the river has a uniform speed of 5.00 km/h and flows due East.
The arm contains 150 cm3 of blood with a concentration of 2.50×1020 Na+ ions per cubic centimetre. If no other ions were present in the arm, what would be the magnetic force on the arm?
A horizontal board 7.0 m long is used by pirates to make their victims walk the plank. A pirate of mass 105 kg stands on the shipboard end of the plank to prevent it from tipping. Find the maximum
Mars Rover When the Mars rover was deployed on the surface of Mars in July 1997, radio signals took about 12 {rm min} to travel from Earth to the rover. How far was Mars from Earth at that time?
At the instant she contacts the water her speed is 9.35 m/s and her body makes an angle of 71.5° with respect to the horizontal surface of the water. Determine her initial velocity.
A truck with a mass of 3000 kg moves at a constant speed of 20 m/s. What is the Net Force acting on it?
A 4 {rm g} bug stands at the top of the sphere. He then walks along the surface of the sphere until he reaches its "equator."
draw a FBD of the collar and choose the best coordinate axis. b) find the speed of the collar just before it hits the stopper at the end of the bar and c)find the time it takes the collar to travel
When the log is 10 m from the bridge floating toward it a, person drops a stone from the edge of the bridge the stone hits the water 2m in front of the log how high is the bridge?
Light incident on a pair of slits produces an interference pattern on a screen 2.4 m from the slits. If the slit separation is 0.017 cm and the distance between the bright fringes in the pattern is
3kg baseball travelling at 45 m/s approaches a waiting batter. when the ball is hit, its back, sailing away at 70 m/s. determine the magnitudes of its initial and final momenta?
The new equilibrium such that the new equilibrium position is 60 relative to the vertical. If the new small-oscillation frequency is 6 radians per second, find the rod length L.
At t = 0, a particle leaves the origin with a velocity of 6m/s in the positive x direction and moves in the xy plane with a constant acceleration of (-2 i - 4 j) m/s 2. H ow far is the particle fro
A diverging lens (f = -13 cm) is located 23.0 cm to the left of a converging lens (f = 33.8 cm). Determine the distance of the final image relative to the converging lens.
Gravitational potential energy of a mass m a height h above but close to the surface of the earth is said to be given by the expression ΔPE=mgh. Show that for heights much smaller than the ra
An artillery shell is fired with a minimal velocity of 390 m/s at 52o above the horizontal. To clear an avalanche, it explodes on a mountain side 43 s after firing. What is the y-coordinate?
A dockworker applies a constant horizontal force of 80.0({rm N}) to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance
How long (in years) will it take for 99.9778% of the 38Sr90 released in a nuclear reactor accident to disappear?
A hare and a tortoise compete in a race over a straight course 2.25 km long. How far is the tortoise from the finish line when the hare resumes the race?
A monochromatic light is incident on the surface of a metal with work function W = 2.2 eV. If a stopping potential V = - 2 V is required to make the photocurrent zero, what is the wavelength of light
When the balloon is 3.09 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?