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Question: A 6.1 kg penguin is sliding on a frictionless horizontal surface with an initial speed of 7.1 m/s. A varying magnitude force is applied in the direction of the motion. The force starts at 23.4 N and decreases at a constant rate so that the force is 9.0 N after 12 seconds. What is the penguin's speed after 8.3 seconds?
In this problem take right as positive and up as positive (regular coordinate system). A rocket ship has anx-acceleration of 40.0 m/s/s left. It has a y-acceleration of20.0 m/s/s up. The starting velocity of the rocket is v= +100.0i + 0.0j. (Here i =..
An ice chest is constructed of a 0.4 mm thick plain-carbon steel plate, a 1.9 cm thick layer of Styrofoam {k=0.033 W/(m-C)} and a 0.65 cm thick fiber glass liner. The cooler has inside dimensions of 25x40x100 cm. The
A 3.1 kg block slides down a frictionless ramp, as shown in the figure. The top of the ramp is 1.6 m above the ground; What is the speed of the block when it leaves the ramp
A tennis ball of mass = 0.068kg and speed = 21m/s strikes a wall at a 45 degree angle and rebounds with the same speed at 45 degrees. What is the magnitude of the impulse given to the ball
The star Sirius has a surface temperature of 9750 K and aradius 2.4 times larger than the Sun's. What is the ratio of the flux (energy per square meter persecond) emitted from the surface of Sirius to the flux emittedfrom the surface of the Sun?
a pilot flies her route in two straight-line segments. the displacement vector a for the first segment has a magnitude
a rock is thrown horizontally with a speed of 17 ms from a vertical cliff of height 30 m.a how long does it take to
a typical car under hard braking loses speed at a rate of about 6 ms2. the typical reaction time to engage the brakes
A robot probe drops a camera off the rim of a 239 meter high cliff on Mars, where the freefall acceleration is -3.7m/s^2. Determine the time required for it to hit the ground
question1an ideal gas expands at a constant pressure of 6.00 105 pa from a volume of 1.00 m3 to a volume of 4.00 m3 and
If the throat velocity is sonic, determine the exit static pressure, temperature, and Mach number, if the exit is subsonic and the exit is supersonic.
Reluctant diver Dave is hanging by his fingertips at the high-dive board, a distance of 8m from the water. His friend pries his fingers from the board, How long does it take Dave to reach the water
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