Other Physics Answers

Gabby is driving her 2400kg Mercedes on a rainy night (Oh, no…!) at a constant rate of 83km/hr when she sees a tree branch lying across the road 60 meters ahead and applies the brakes in a hurry (there will be some skidding involved, I fear). The coefficient of kinetic friction is 0.41.

1. Will Gabby stop before hitting the branch? What will the actual stopping distance be? 
2. How much time will be required to stop? 
3. What will be the average deceleration rate?

The displacement vectors A and B, when added together, give the resultant vector R, so that R = A + B. Use the data in the drawing and the fact that φ = 23° to find the magnitude R of the resultant vector and the angle theta that it makes with the +x axis.

Find the value of energy of a wave with a frequency of 8 Hz. Given: h = 6.63x1034 J f= 8Hz or 8/s E=?

A superman is sitting on a tree 98m right with a baby he has rescued from the claws of a tiger. Unfortunately the child slips and fall with an initial velocity of 0ms^–². Superman realized what was happening 2 seconds later and flow to catch the child at a speed of 39.2ms^–¹. Calculate

(1) the time superman will fly before catching the child.

(2) the distance superman will fly before catching the child.

Missing dimouter, the former platoon Oliver of the rungling brothers eishesy had a kinetic energy is 12000 just primer to hitting the bucket of water. Ik Missy’s mass is 40kg, then what is her speed

If you are to plot a graph of h(cm) on y axis against T on the x axis, what's the best scale to use?

A wire , 20m long is heated from a temperature of -5⁰c to 55⁰c,if the change in length is 0.020m, calculate the linear expansivity of the wire

If a line to ground fault occurs at the supply voltage causing a very high current of 500A, what is the new receiving end voltage at the car side

1. An object of mass 3kg is dropped from the roof of a two-storey house and reaches the ground with a speed 10 m/s. Neglecting friction, calculate:

i. The kinetic energy of the speed when it reaches to

the ground.

ii. The potentia energy of the object when it is on the

roof.

iii. The height of the roof

iv. The total mechanical energy of the object when it is

1 m above the ground.

2. A man who has a mass of 80 kg can run up a flight of stairs of 20 steps in 5 seconds. Given the each steps in 20cm high, how much power does the man use to run up the flights of stairs?

1. Estimate the volume of the earth in m3 by assuming that its radius is 6400km.

2. A car accelerates from zero to 20 m/s in 5 s.

i. Calculate the acceleration of the car.

ii. If acceleration is assumed to be constant, how far

will the car travel in 15 s?

iii. Calculate the speed of the car after 15 s.

3. A KTM Commuter train travel between two station, A and B. The train from rest from station A and accelerates at a constant rate for 0.5 k.m until it reaches a speed of 30 m/s. It then travel at this constant speed for Ts before decelerating at a constant rate of 1.5 m/s and coming to rest at station B. Determine the value of T if the distance between the two stations 6km. Calculate also the total time taken for the whole journey.