Mechanics | Relativity Answers

The speed of an aeroplane is 1200m/s. The engines take in 80 kg of air per second and mix
it with 40 kg of fuel. This mixture is expelled after it ignites and it moves at a velocity of 3000m/s
relative to the aeroplane. Calculate the thrust of the engine.

If the constant acceleration continues for 6.0 seconds, what will be it's velocity then

a taxi leaves the station x for station y every 10 minutes . simultaneously , a taxi leaves the station y also for staion x every 1o minutes. the taxis move at the same constant speed and go from x to y or vice versa in 2 hours , how many taxis coming from the other side will each taxi meet enroute from y to x?

Does line of action of the weight of the body ends at the centre of gravity?

A bullet is fired on a horizontal from 1.50m. If it his a target 0.50m high that is a 100m away, how fast is the bullet traveling

Two forces are of magnitude 450N and 240N respectively . Determine
{a} the maximum magnitude of the resultant force
{b} the minimum magnitude of the resultant
{c}the resultant force when the forces act at right angles to each other.
{d} Use scaled vector diagram to determine the resultant of [c] above and compare your results

A sonometer wire under a tension of 40 N , vibrates in unison with a tuning fork of frequency 384 Hz. find the number of beats produced in 2 sec when the tension in the wire is reduced by 1.24 N . 2.] A conical pendulum has length 1 m and bob of mass 0.1 kg the angular speed of the bob is 14/√10 rad/sec, find the tension in the string.

Sally travels by car from one city to another. She drives for 27.0 min at 70.0 km/h, 50.0 min at 44.0 km/h, and 38.0 min at 75.0 km/h, and she spends 12.0 min eating lunch and buying gas.
(a) Determine the average speed for the trip.
km/h
(b) Determine the total distance traveled.
km

Your opponent, in a desperate attempt to return your wicked serve, makes a high lob of the tennis ball that causes it to land out of bounds on the asphalt course behind you. It then bounces so that it just barely clears a 3.52 m wall that is 2.22 m from where the ball hit the asphalt and that is separating your court from the next. In the adjacent court play is suddenly interrupted by the ball leaving your court and bouncing 1.82 m up into the action. How far horizontally, in meters, does the ball travel in this second bounce? Hint: Use the trajectory of the first bounce to get the horizontal speed, and assume that it remains unchanged between bounces

An automobile with an initial speed of 4.47m/s accelerates uniformly at the rate of 3.0
m/s.