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An initially stationary hovercraft sits on a large lake. At time t=0 it accelerates due north at a rate of 1.2 m/s2 for 10 s, does not accelerate at all for the next 10 s, and then accelerates at a rate of 0.6 m/s2 due east for another 10 s. The hovercraft then coasts for another 10 s without any acceleration.
a. what is the velocity of the hovercraft at time t=40 s?
b. What is the displacement of the hovercraft at time t=40 s?
Waterslides are nearly frictionless, hence can provide bored students with high-speed thrills. If Kevin is clocked at 25 m/s at the bottom of the slide, find the work done on him by friction
Calculate the wavelength of light in vacuum that has a frequency of 7.8 108 Hz. and What is its wavelength in carbon tetrachloride
What is the total charge of all the electrons in a 14 kg bar of zinc? (Zinc has 30 electrons per atom and an atomic mass of 65 u.)
A car entering a freeway ramp accelerates from 14 m/s to 25 m/s in 10 seconds. what is the cars average acceleration during this 10 seconds.
In one design, the large spring with spring constant 2.0×10^4 was placed behind the cannon. The other end of the spring braced against a post that was firmly anchored to the ship's frame.
A baseball with a mass of 0.152 kg is moving horizontally at 32.0 m/s [E], when it is struck by a bat for 0.00200 seconds, Find the average net force of the ball
One can not align the apparatus to eliminate entirely the effects of the Earth's magnetic field. calculate the component of the earth magnetic field perpendicular to the entering electron beam
A student doing an experiment pours 0.160kg of heated copper shot into a 0.355-kg aluminum calorimeter cup containing 0.240kg of water. find the initial temperature of the shot
Consider a spacecraft in an elliptical orbit around the earth. At the low point, or perigee, of its orbit, it is 300km above the earth's surface; What is the period of the spacecraft's orbit
Pick at least two sample cases and for each sample case include both a physical reason you'd expect fo to go up or down (think about how sound waves are squishing together or spreading apart) and a mathematical reason (like will picking a + in the..
It collides with a 10,000 kg railway car resting at the bottom of the track with its brakes off. The two cars couple together and roll up the track to a height of h. find out h.
The largest moon of Pluto, Charon, was discovered in 1979. Charon is in a circular orbit of radius 19,600 km around Pluto, What is the total mass of the Pluto-Charon system
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