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An empty freight car with a mass of 10,000 kg rolls at 5 m/s along a level track and collides with a loaded car
with a mass of 20,000 kg, standing at rest with breaks released. Friction can be neglected. If the cars couple
together, find their velocities after the collision.
b) Find the decrease in kinetic energy as a result of the collision.
c) With that speed should the loaded car be rolling toward the empty car for both to be brought to rest
collision?
a stone is thrown horizontally from the roof of a building 15 m high with an initial speed of 5 m/s. How long will it take before the ball hits the ground?
Find the electric flux in a sphere of radius 0.48 cm from a charge of 55 nC.
What is Lorentz number? The thermal and electrical conductivities of Cu at 20oC are 390 Wm-1K-1 and
5.87x107W-1m-1 respectively. Calculate Lorentz number.
Earth orbits the sun once every 365.25 days.
Find the average angular speed of Earth
about the sun.
Answer in units of rad/s.
An object which is electrically neutral contains only neutrons.
A 140 kN force with a slope of 4 vertical and 7 horizontal is located on the second quadrant. Determine its y- component.
An automobile and a truck start from rest at the same instant, with the automobile
initially at some distance behind the truck. The truck has a constant acceleration of 2
m/s2 and the automobile at an acceleration of 3 m/s2
. The automobile overtakes the
truck after the truck has moved 75 m. Try to draw the figure.
a) How long does it take the auto to overtake the truck?
b) How far was the auto behind the truck initially?
c) What is the velocity of each when they are abreast?
16. In a circuit 20 C of charge is passed through a battery in a given time. The plates of the battery are maintained at PD of 20 V . How much work is done by the battery?
an electric fan is rotating at 3.0 rad/s when at time t=0 it begins to constantly accelerate at 2.00 rad/s^2. The initial linear acceleration of the edge of the spinning part of the fan has a magnitude of 1.30 m/s^2. What is the radius of the spinning part of the fan?
