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A 4000 kg truck is at rest at an intersection, waiting for a green light (with no other vehicles around). It is a snowy and icy day, with no friction on the road. A 1000 kg car traveling at 5 m/s strikes the stopped truck square on from behind. The bumpers of the two vehicles lock together as a result of the collision, so that they skid across the intersection together. How fast are they traveling?
A bar with cross-sectional area A = 0.5cm2 is used to conduct heat between two regions at different temperature. The bar is made of silver, k = 417 W/(m·K). Find the length of the silver bar
a transparent oil with index of refraction 1.29 spills on the surface of water index of refraction 1.33 producing a
A person whose eyes are 1.80 m above the floor stands in front of a plane mirror. The top of her head is 0.15 m above her eyes. What is the height of the shortest mirror in which she can see her entire image?
A jet flying at 125 m/s banks to make a horizontal circular turn. The radius of the turn is 3810 m, Calculate the magnitude of the necessary lifting force
An amateur astronomer decides to build a telescope from a discarded pair of eyeglasses. One of the lenses has a refractive power of 11 diopters, while the other has a refractive power of 1.1 diopters.
A horizontal spring, resting on a frictionless tabletop, is stretched 14 centimeter from its unscratched configuration and a 1 kilogram mass is attached to it. Obtain how does its final potential energy compare to its initial potential energy
Eddie the Eagle, British Olympic ski jumper, is attempting his most mediocre jump yet. What was the magnitude of Eddie's initial velocity as he left the ramp
Your cell phone typically consumes about 440 mW of power when you text a friend. what is the current flowing through the cell-phone circuitry under these circumstances
A 100 kg block is suspended from a string and immersed in water. The block has a volume of 0.02 m^3. The water density is 1000 kg/m^3. What is the buoyant force on the block
From the ground a projectile is fired with a velocity of 30m/sat 30 degrees above the horizontal. How long will the projectile take to return to the ground
Is it possible for the efficiency of some device or machine to be greater than 1? either give and example where efficiency is greater then 1 or explain why it's not possible.
a steel wire has the following properties length 5.50m cross-sectional area 5.00times10?2cm2 youngs modulus
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