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A uniform bar is 4m long. It weighs 300N. At one end, 1m from the pivot point, there is a resisting weight of 2000N. What force must be applied at the other end to produce equilibrium?
1. An 80kg painter stands on a uniform 25 kg platform board supported by two wooden poles on each side. If each of these two poles can only hold 1000N and they are located at the ends of the 4m platform, will it be safe for him to stand at 1m from one end of the platform?
A boy throws a rock with speed v = 18.3 m/s at an angle of θ = 57.0° over a building. The rock lands on the roof 15.0 m in the x direction from the boy. How long was the rock in the air? How much taller, height h, is the building than the boy? Ignore air resistance.
The position of a particle is given by x(t)=4.0t^2+0.5t^3m
a. Find the instantaneous velocity at t=5.0 to 3.0sec
b. What will be the average velocity fist =5.0 and 6.0
The radius of a Capillary tube 1S 0.04m. When placed in a Beaker cotaining Water, the through the Capilary tube by .05cm.Calculate the Coefficient of Surface Tension observed in the tube. Take g-10m/s
On top of a spiral spring of force constant 500Nm-1 is placed a mass of 5*10kg. If the spring is compressed downwards by the length of 0.02m and then released. Calculate the height of which the Mass is projected
a 400-g ball is released from rest at a hieght of 10m. ignoring air resistance, determine the GPE, KE, and total mechanical energy at each of the following heights: 10m, 7.5m, 5m and 2.5m
A 2kg block at rest is acted upon by a constant force of 20N for 4 seconds. Find the final velocity of the block. Show complete solutions.
A 2kg block at rest is acted upon by a constant force of 20N for 4 seconds. What momentum is required by the block ?
40. What is the velocity of the wave in a guitar string having a length of 0.65 m
and a mass of 3.5 g when subjected to a tension of 250 N?
41. While fishing, you notice that eight crests pass a given point in a time
interval of 10s. You approximate the distance between two crests to be 1.2
m. Calculate the
a) Speed of water waves and
b) Depth of water
42. On November 7, 1940, the Tacoma Narrows suspension bridge collapsed just
four months after it opened. Do research on causes why the bridge had set
in motion that led to its collapsed.
