Mechanics | Relativity Answers

A copper wire and steel wire of same crossectional area that of length 1m and 2m respectively are connected end to end.A force is applied which stretches their combined length by 1cm.find how much each wire is elongated.

Q) A model car, of mass 1.5 kg. with a string attached to its upper end, is placed on a slope as shom,ii in the diagram. The force in the string, parallel to the slope, needed to move the car up the slope at a constant velocity is 10 N.
(i) Describe, with the aid of a diagram, how the force in the string can be measured

William throws the ball to Caleb who is standing 40 meters away. 1/4 of the way the ball is going Caleb it’s height is at 8 meters. Calculate the max height.

A 10kg box accelerates down a slope at 5m/s what is the magnitude of friction?

The incline is 15 degrees.

The displacement of an oscillator is written as
y(t) = a sin (ωt ± φ)
whereas the equation of a wave is written as
y(x, t) = a sin (ωt − kx)
Highlight the differences between the two.

A boat can safely displace 2.50 m3 of water without sinking, and the boat itself has a mass of 850 kg. What maximum mass of passengers and cargo can the boat carry safely in a fresh-water lake? [6] 2.2 A pipe in the basement of an apartment complex is accidentally punctured, causing a leak through the small hole formed (see Figure 2). An astute physics student estimates that the water is leaking out a speed of 25 m/s. Apply the Bernouli equation to estimate the gauge pressure inside the pipe. [8]

A 1610kg car accelerates from zero to 100km/h in 5.50 s. Calculate it’s average power output of the engine

A warning system has calculated that two asteroids will collide not far from Earth any time soon.
The smaller asteroid has the massmandmoves with the velocity vm. The bigger asteroid has the
massM = 3mand the velocity of vM = 1
2vm. They collide at an angle of  = 60 and turn into a
single heavy asteroid (inelastic collision):
M
m


(a) Calculate the velocity of the single object aer the collision.
(b) Determine the angle  aer the collision.

Water enters a round fire hose of diameter 3.5cm and exits from a round, 0.60cm diameter nozzle. If the water enters the house at 2.0 m/s, what is the velocity of the existing water?

If vector a=4j+3i and vector b=3j+4i, find the vector difference of a and b.