Field Theory Answers

A footballer kicks a ball with a force of 500N if the ball meets his leg just for 1 sec the impulse acted on the ball is

The power steering in an automobile has a mechanical advantage of roughly 75. If the input force on the steering wheel is 49 N, what is the output force that turns the car’s front wheels?

Metrological measurements show wind speed of 20 mph. What is the speed of train?

Determine the work done by the force F(xy+3z)i^+(2y^2 -x^2)j+(z-2y)k in taking a particle from  x = 0 to  x =1 along a curve defined by the equations: x^2= 2y ; 2x^3= 3z

PHYSICS

1. A piece of copper block of mass 24g at 2300C is placed in a copper calorimeter of

mass 60g containing 54g of water at 31oC. Assuming heat losses are negligible,

calculate the final steady temperature of the mixture. [Specific hest capacity of water

= 4200Jkg – 1 K – 1

, specific heat capacity of copper = 400Jkg – 1 K – 1

].

2. The lower and upper fixed points marked on a mercury in glass thermometer are

210mm apart. The end of the mercury column in the tube is 49mm above the lower

fixed point in a room. What is the temperature of the room in degree celcius.

The density of 400cm of palm oil was 0.9gcm-3 before frying. If the density of the oil was 0.6gm-3 after frying, assuming no loss of oil due to spilling, its new volume was?

Find the current that flows in an electric field when the time rate is 2mins and the charge is 1600C

A tractor of mass 5.0x10^3kg is used to tow a car of 2.5x10^3kg. the tractor moved with a speed of 3.0m/s just before the towing rope became taut.calculate the speed of the tractor immediately the rope becomes taut.

Bernoulli's effect to measure speed of wind.Expain how it measures increases in speed of wind

A double decker bus is observed to have fewer passenger seats in the upper deck . Explain how this contributes to its stability