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A 915 N crate rests on the floor.
(a) How much work is required to move it at constant speed5.5 m along the floor against afriction force of 180 N?
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(b) How much work is required to move it at constant speed5.5 m vertically?
A soccer ball whose radius is 11 cm rolls a distance of 10 min 3.50 s. It rolls without slipping. What is the angular speed of the ball
An electron with an initial speed of 4.90×105m/s is brought to rest by an electric field. What was the potential difference that stopped the electron
Medical ultrasound. Ultrasound with = 5.8is used in a medical imager. Find the wavelength in air, with sound speed 343. Find the wavelength in muscle tissue
A gymnast with mass m1 = 49 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 119 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left end ..
The projection lens in a certain slide projector is a single thin lens. A slide 23.9 mm high is to be projected so that its image fills a screen 1.84 m high. Determine the focal length of the projection lens
A 73kg hiker climbs to the top of a 4000m -high mountain. The climb is made in 5.5h starting at an elevation of 2900m. Calculate the work done by the hiker against gravity
In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped int..
a wheel of diameter 144 cm has an axle of diamter 15 cm. a force of 150N is exerted along the rim of the wheel. What force should be applied to the outside of the axle
The rocket moves for 3.00 s along its initial line of motion with an acceleration of 32.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile. Find out the maximum altitude reached by the rocket.
A spaceship moves radially away from Earth with acceleration32 m/s2. How long does it takefor the sodium streetlamps (λ congruent 589 nm) on Earth to be invisible (with a powerfultelescope) to the human eye of the astronauts? The range of visiblewave..
compute the tension in a string that whirls a 2kg toy in a horizontal circle of radius 2.5m when it moves at 3m/s
A rock is thrown vertically upward with a speed of 19.0m/s from the roof of a building that is 70.0m above the ground. Assume free fall. What is the speed of the rock just before it strikes the ground?
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