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A football is kicked vertically upward from the ground and a student gazing out of a window sees it coming passed him at 16ft/sec. The window is 30ft above the ground.
a. How high does the ball go above the ground?
b. How long does it take to go from a height of 30ft to the highest point?
A. Illustrate the equations that describe the physical quantities of motion:
distance, displacement, velocity and acceleration.
Displacement in linear motion is a vector quantity but angular displacement is not.Explain
A ball of mass 5 kg is dropped from a height of 1.4 m (from the ground). ) onto a massless spring (a spring with a length balance of 0.5 m). The ball compresses the spring a distance of 0.29 m while at rest. Calculation springs.
vector A points north and vector B points east. If vector C=B-A, then vector C points
An electric fan is supplied by a constant current of 0.14 A. Calculate
the time for which it is
operated when the total charge flow is 170 C.
As a sled moves across a flat snow-covered field at constant velocity, is any work done?
How does air resistance enter into the picture?
he current in a tungsten filament lamp is 0.25 A. The filament has a radius o
f 5.4 × 10
−6
m
2
.
Tungsten has 3.4 × 10
28
electrons per cubic metre. Show that the mean drift velocity of the
electrons in this very thin filament is about 0.5 m s
−1
- Compute the acceleration of the block sliding down a 20o inclined plane if the coefficient of kinetic friction is 0.60.
- A box is along a frictionless horizontal floor and a force of 250 N pushes the box with an angle of 40o with the horizontal. Starting from rest, the box achieves a velocity of 8 m/s in a time of 4 seconds. What is the weight of the box and the force exerted by the floor on the box?
