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Using a simple pulley/rope system, a crewman on an Arctic expedition is trying to lower a 5.91kg crate to the bottom of a steep ravine of height 22.1 meters. The 45kg crewman is being careful to lower the crate at a constant speed of 1.5 m/s. Unfortunately, when the crate reaches a point of 12.3 meters about the ground, the crewman sliips and the crate immediately accelerates toward the ground, dragging the crewman across the ice and toward the edge of the cliff. If we assume the ice is perfectly slick (that is, no friction between the crewman and the ice once he slips and falls down), at what speed will the crate hit the ground? Assume also that the rope is long enough to allow the crate to hit the ground before the crewman slides over the side of the cliff. Also, at what speed will the crewman hit the bottom of the ravine? Assume no air friction. Both answers in m/s.
A 7.0 kg object undergoes an acceleration of 2.5 m/s2. What is the magnitude of the resultant force acting on it
Which of the following will create a magnetic field? An ion that is slowing down from 500 km/h to 400 km/h. neutron that is speeding up from 1000 m/s to 1200 m/s.
The camera is 4.50 m in front of the mirror. What is the distance between the camera and the apparent position of the bird's image in the mirror
A research submarine has a 20-cm-diameter window that is 8.0cm thick. What is the submarine's maximum safe depth in salt water
A 2.30 N force pushes it to the left, and a 0.800 N force pushes it to the right. (a) Taking right to be positive, what is the net force acting on it? (b) What is its acceleration?
If a bullet is fired vertically upwards with the speed calculated in (b), what is the maximum height that the bullet can reach.
How long after being thrown will the balls collide
A person on earth notices a rocket approaching from the right at a speed of 0.74c and another rocket approaching from the left at 0.52c. What is the relative speed between the two rockets
According to safety standard for air bags, the maximum acceleration during a car crash should not exceed 60 g and should last for no more than 36 ms.
Suppose that three astronauts outside a spaceship decide to play catch. All three astronauts have the same mass and are equally strong. How long will the game last
What is angular width of the beam
A 2.6-kg sphere of radius 35 cm is initially rolling on a flat surface with a speed of v = 0.40 m/s. Determine the force F and the distance l
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