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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?
Three blocks of mass m1=1.0 kg, m2=2.0 kg, and unknown mass m3 are on a frictionless forizontal surface, What is the unknown mass m3
The amplitude of a lightly damped oscillator decreases by 1.7% during each cycle. What percentage of the mechanical energy of the oscillator is lost
Two blocks of masses m1 = 1.90 kg and m2 = 5.18 kg are each released from rest at a height of h = 5.15 m on a frictionless track, find the maximum height to which m1 rises after the collision
How many electrons would have to be removed from one sphere and added to the other to cause an attractive force between the spheres of magnitude 1.00 x 10^4 N (roughly one ton)? Assume that the spheres may be treated as point charges.
A woman is reported to have fallen 139 ft from a building, landing on a metal ventilator box, which she crushed to a depth of 30 in. She suffered only minor injuries.
A 10 kg block of metal is massed on a spring scale in air. What is the desnity of the metal
A toy train is pushed forward and released at x0=2.0 m with a speed of 2.0 m/s. What is the magnitude of the train's acceleration after its wheel begins to stick
A ball of mass M = 17 kg is suspended from a vertical inextensible string of length l = 1.5 m. A bullet of mass m = M/2 traveling with a horizontal velocity v = 9sqrt(g*L) collides with the ball, What is the velocity of the ball-bullet system
An air bubble has a volume of 1.25 cm3 when it is released by a submarine 100 m below the surface of a lake. What is the volume of the bubble when it reaches the surface
If the merry-go-round completes one revolution every 5.2 s, find out the angular speed and the linear speed of each child.
Starting from rest, a 98 kg firefighter slides down a fire pole. The average frictional force exerted on him by the pole has a magnitude of 800N, and his speed at the bottom of the pole is 3.2 m/s. How far did he slide down the pole.
A 60.0-kg runner expends 300 W of power while running a marathon. determine the volume of bodily fluid (assume it is water) lost per hour
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