Mechanics | Relativity Answers

Contrast the metric units of distance, time, and speed. Describe the relationship between them.
Breaking it down into parts of,
Specific units of distance, time and speed.
Which are base units which are derived units.
How is speed derived.

two lovers are parked 10.0m from the edge of a cliff in a car (m=1000kg, including the two occupants). A jealous suitor ties a rope to the car's bumper and a 50kg rock to the other end of the rope. he then lowers the rock over the edge of the cliff, and the car, which is in neutral, accelerates towards the edge. Determine the acceleration of the car towards the edge and how long do the lovers have to apply the brakes before they go over the edge.

person with external body temperature 35degree celcius in room temp 25degree celsius emisivity 0.5 surface area 2.0m2 calculate radiant power

When objects moving in a circle the velocity vector is pointed in what direction on motion

A helium-filled balloon is tied to a 2.00-m-long,
0.050 0-kg uniform string. The balloon is spherical with a radius of 0.400 m. When released, the balloon lifts a length h of string and then remains in equilibrium. Determine the value of h. The envelope of the balloon has a mass of 0.250 kg.

Take a hollow plastic ball (dia 3cm to 5cm) using a needle. Pass a thread of about 105 cm along a diameter of the ball.Tie a knot at one end. Hang the ball from a rigid support so that the ball is free to oscillate.Make a small hole (5mm dia) in the ball near the top.Fill it with sand and find its time period of oscillation. Empty the ball and fill it with steel balls/iron filings and repeat the experiment.Similarly carry out the experiment with common salt.compare the time periods obtained in the above three cases.What do you find? Explain your finding.

A pillar of circular cross section is 5 m long. A
200 kN load acts at the top of the pillar.
Determine maximum stress and total
shortening of the pillar due to the top load
and its own weight. The unit weight of the
material is 79 kN/m3 and modulus of
elasticity, E = 2×105 N/mm2.

A car is traveling at 100 m/s. A deer is 150 m in front of the car and does not move. The car decelerates at 20 m/s^2. How far does the car travel before it stops?

Explain what happens when a body is raised to a height from the surface of earth and then given a horizontal velocity v such that:
i) 0 < v < 8.0 km/s
ii) v = 8.0 km/s
iii) 8.0 < v < 11.2 km/s
iv) v = 11.2 km/s

Car A has a mass of 1000kg moving at a velocity of 20m/s collides with Car B of mass 1200kkg moving at 10m/s in the same directionIf the car B is shunted forward at 15m/s by the impact, what is the velocity,v, of the car A immediately after the crash?