Showing 431 to 440 of 784 Questions

A 40 kg girl and an 8.4 kg sled are on the frictionless ice of a frozen lake, 15 m apart but connected by u rope of negligible mass. The girl exerts a horizontal 5.2N force on the rope. What are the acceleration magnitudes of? (a) The sled and (b) The girl?(c) How far from the girl's initial position do theymeet?
1613 
Figure shows an overhead view of a 0.0250 kg lemon half and two of the three horizontal forces that act on it as it is on a frictionless table. Force F1 has a magnitude of 6.00 N and is at θ1 = 30.0o. Force F2 has a magnitude of 7.00 N and is at θ2 = 30.0o. In unitvector notation, what is the third force if the lemon half (a)
11264 
A block is projected up a frictionless inclined plane with initial speed v0: 3.50 m/s. The angle of incline is θ = 32.0o. (a) How far up the plane does the block go? (b) How long does it take to get there? (c) What is its speed when it gets back to the bottom?
1569 
A 40 kg skier skis directly down a frictionless slope angled at l0o to the horizontal. Assume the skier moves in the negative direction of an x axis along the slope. A wind force with component Fx acts on the skier. What is Fx if the magnitude of the skier's velocity is (a) Constant, (b) Increasing at a rate of 1.0 m/s2, and (c) Increasi
0474 
A sphere of mass 3.0 x 104 kg is suspended from a cord. A steady horizontal breeze pushes the sphere so that the cord makes a constant angle of 37o with the vertical. Find (a) The push magnitude and (b) The tension in the cord.
2688 
A dated box of dates, of mass 5.00 kg, is sent sliding up a frictionless ramp at an angle of θ to the horizontal. Figure gives, as a function of time t, the component vx of the box's velocity along an x axis that extends directly up the ramp. What is the magnitude of the normal force on the box from the ramp?
3591 
An elevator cab and its load have a combined mass of 1600 kg. Find the tension in the supporting cable when the cab, originally moving downward at 12 m/s, is brought to rest with constant acceleration in a distance of 42 m.
1537 
Holding on to a towrope moving parallel to a frictionless ski slope, a 50 kg skier is pulled up the slope, which is at an angle of 8.0o with the horizontal. What is the magnitude F rope of the force on the skier from the rope when (a) The magnitude y of the skier's velocity is constant at 2.0 m/s and (b) v = 2.0m/s as y increases at a rat
0289 
An elevator cab that weighs 27.8kN moves upward. What is the tension in the cable if the cab's speed is?(a) Increasing at a rate of 1 .22 m/s2 and (b) Decreasing at a rate of 1 .22 m/s2?
1651 
A lamp hangs vertically from a cord in a descending elevator that decelerates at 2.4 m/s2. (a) If the tension in the cord is 89 N what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 2.4 m/s2?
1603