Mechanics | Relativity Answers

An aeroplane moves horizantaly at 162km/h speed at height of 2km above the ground, towards a fixed Target on a ground. If a bomb is to released to hit the target from the aeroplane detarmine where should the bomb be released? Also calculate the velocity with which the bomb strike the target

What minimum force applied at 8 inches axle of 2 feet wheel is necessary to raise the wheel over an obstacle of 10 inches height? Take r as radius and W as its weight.

Q : In which of the following situations would it be harder to drive around a bend without skidding?
1)Slow speed in a sharp (tight) bend
2)Slow speed in a gentle bend
3)High speed in a sharp (tight) bend
4)High speed in a gentle bend

A 5.4kg rock and a 8.8x10^–4 kg pebble are held near the surface of the earth. (A) determine the magnitude of the gravitational force exerted on each by the earth. (B) calculate the magnitude of the acceleration of each object when released.

A dynamite blast at a quarry launches a rock straight upward and 1.5s later it is rising at a rate of 11m/s. Assuming air resistance has no effect on the rock calculate its speed (a) at launch and (b) 5.1s after launch. I have gotten the answer for (a) which is 25.7m/s however I can not get (b). I have tried using the V=vo+at formula to get (b) which gives you -24.28 but this answer keeps on coming up as incorrect. I’m unsure what to do next.

One strategy in a snowball fight is to throw
a snowball at a high angle over level ground.
While your opponent is watching this first
snowball, you throw a second snowball at a
low angle and time it to arrive at the same
time as the first.
Assume both snowballs are thrown with
the same initial speed 30.9 m/s. The first
snowball is thrown at an angle of 51◦
above
the horizontal. At what angle should you
throw the second snowball to make it hit the
same point as the first? The acceleration of
gravity is 9.8 m/s
2
.

Fc=mv2/r
Fc is centripetal force, m is mass, v is speed and r is radius


What will happen to the size of the centripetal force if the radius (r) is doubled?


1)No change
2)The centripetal force doubles
3)The centripetal force increases by a factor of 4
4)The centripetal force is halved

Adam pushes a 47 kg boat across a frozen lake. The coefficient of kinetic friction between the boat and the ice is 0.13 and the boat acceleration at 0.6 m/s^2. Calculate the magnitude of Adams force in the boat.

An olympic.class sprinter starts a race with starts an acceleration of 4.50m/s². what is her speed 2.40s later?

a body of mass 50 gram is attached to a spring. the motion of the spring will have the amplitude 12 centimetre and the time period 1.7 second .find the the maximum velocity, maximum acceleration, velocity at time 5 sec and acceleration at distance 0.06m
Please answer early as possible