Mechanics | Relativity Answers

A parachute opens during the spacecrafts descent through the atmosphere.

Figure 2 shows the parachute spacecraft system with the open parachute displacing the atmospheric gas. This causes the system to decelerate.

Explain with reference to newtons laws of motion why displacing the atmospheric gas causes a force on the system and why this force causes the system to decelerate

a=I+2j-3k

b=4i+j-7k.

Find the modulus and direction cosine of the following

b+a

b-a

a sphere whose radius at time t is b+acosnt is surrounded by liquid extending to infinity under no force . prove that the pressure at distance r from the centre is less than the pressure at an infinite distance by pn^2/r(b+acosnt)[a(1-3sin^2 nt)+bcos nt+a/2r^3 (sin^2 nt)(b+acos nt)^3]

If you throw candies to the people behind the float in the opposite direction at a speed of 1 m/s, how fast will the candy reach the people?

A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 591N. As the elevator later stops , the reading is 391N. The magnitude of the acceleration is the same as during starting and stopping

Calculate weight of the person

For the hydraulic lift shown in Fig. 12.7, what must be the ratio of the diameter

of the vessel at the car to the diameter of the vessel where the force F1 is

applied so that a 1520-kg car can be lifted with a force F1 of just 125 N?

a perfect body is converted to equal energy , now suppose same body develops some non performing parts which cant function anymore ,now here mass remains same but it cant equalise with same energy as above ,hence how can e=mc2 be applicable to both

A stone is falling freely from rest and the total distance covered by it in the last second of its motion equals the distance covered by it in the first 3 seconds of its motion. How long does the stone remain in air?

1. A ship has an area of cross section at the water line 200m, by what depth does the ship sink in fresh water when it loads a cargo of 4000 tones

b) if the ship and the cargo has a displacement turnage of 123000 tones , by what amount will the ship rise in the water ,when it sails from fresh water into Sea water

Density of Sea water 1025m

1. Determine the power requirement to pull a four bottom 30 cm mould board plough working to a depth of 15 cm.

The tractor is operated at a speed of 6 km/h. The soil resistance is 0.7 kg/cm2