Lisa W.

# A few physics questions I'm having trouble with

In the figure, a crate of mass m = 103 kg is pushed at a constant speed up a frictionless ramp (θ = 29°) by a horizontal force. The positive direction of an x axis is up the ramp, and the positive direction of a y axis is perpendicular to the ramp. (a) What is the magnitude of   ? (b) What is the magnitude of the normal force on the crate?

A dated box of dates, of mass 7.6 kg, is sent sliding up a frictionless ramp at an angle of θ to the horizontal. The figure here 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?

A block of mass m1 = 3.65 kg on a frictionless plane inclined at angle θ = 29.2° is connected by a cord over a massless, frictionless pulley to a second block of mass m2 = 2.44 kg hanging vertically (see the figure). (a) What is the acceleration of the hanging block (choose the positive direction down)? (b) What is the tension in the cord?

## 1 Expert Answer

By:

Lisa W.

O(Pulley)
M1   /     |
/            | M2
/                   |
/___θ__________|

I am not able to upload a picture it seems, but for the third question this is what the diagram looks like. It is an inclined plane with a pulley at the peak of the triangle. There is a block on the hypotenuse and a block hanging off the pulley on the y-axis.
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02/26/15

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