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A 10-kg body is suspended by means of a string. Another string is attached to the bottom of the body and a 5-kg body is suspended from the lower end of the lower string. Find the tension in each string
A string attached to a body of mass 4 kg which rests on a frictionless plane that is
inclined 30o with the horizontal. The string passes over a pulley at the upper end of the
plane and another body of mass 3 kg is attached to the other end of the string, this
body hanging vertically. (a) Find the direction and magnitude of the acceleration of
the two bodies and (b) the tension in the string
A bullet of mass 10 kg is fired into a block of wood with a velocity of 1 km/s. Find the
constant retarding force on the bullet if it penetrates the block 12 cm, assuming the
deceleration to be constant.
The coefficient of static friction between a 20-kg block and a horizontal surface is 0.25
and the coefficient of kinetic friction is 0.15. A cord is attached to the block, the cord
making an angle of 10 degrees with the horizontal. (a) What tension in the cord will just
start the block? (b) What is the tension in the cord when the block moves with uniform
velocity?
A 2 C charge travels with a velocity of ~v = (1.0ˆi+2.0ˆj+2.0 ˆk)m/s through a uniform magnetic field of (5.0ˆi + 4.0ˆj + 1.0 ˆk)T. Calculate the magnetic force exerted on the electron, in vector form.
An electron and a proton separated by a distance of 1.5 × 10 ^ −10 m. Calculate the
magnitude of the electrostatic force between the particles.
What amount of current should flow through a solenoid of 330 turns and diameter 4.5cm, for it to produce a magnetic field strength of 400mT
Find the average retarding force when a 5 g bullet, travelling at 500 m/s, penetrates a
block of wood a distance of 5 cm before it stops.
A projectile Is projected vertically upwards with an initial velocity of 40m/s.two seconds later a second projectile is also projected vertically from the same point with the same initial velocity.
calculate:
a)the maximum height reached by each body
b)the time taken to reach maximum height
c)the time taken for each projectile to return to the point of projectile
d)the time taken and distance moved by each projectile when they pass each other.
A body is projected vertically upwards from ground with an initial velocity of 400m/s.
Calculate:
a)the time taken to reach the ground
b)the velocity when the body is 1.9km above ground level
c)the time taken to reach a vertical hight of 2.6km
