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estimate the hall voltages generated in each case across a 5mm width of sample of thickness 1mm when a current 100mA is passed along it and the perpendicular field is given as 100mT
The angle of elevation of a hot air balloon changes from 30
to 45 degrees in 2 mins. If the point of observation is 200m away from the take
off point. Determine the uniform rate of change of the angle of elevation in
rad/sec.
1. A plane flying at 90° at 1.00×10^2m/s is blown toward 180° at 5.0×10^2m/s by a strong wind find the plane resultant velocity graphically.
2. A racing car reaches a speed of 42m/s. It then begins a uniform negative acceleration, using its parachute and breaking system, and comes to rest 5.5sec later. Find how far the car moves while stopping.
3.A stone is dropped from a building that is 5cm height.calculate the time it takes to reach the ground and the speed of the stone.
1. A boy noticed that the wind was blowing 30m/s 30degree with vertical.he ran with a speed of 40m/s 0 degree. Calculate the magnitude using the cosine law.
2.calculate the magnitude and direction if the vector A is 5N, 0 degree C is 7N, 110 degree,D is 2N, 22 degree E is 6N, 55degree with the horizontal. Calculate the magnitude and direction of a vector.
Dissatisfied with the performance of his heat engine in the previous example, the engineer
wishes to increase its efficiency to 25%. To accomplish this, he decided to change the
temperature of the hot reservoir while keeping the temperature of the cold reservoir constant.
What must be the temperature of the hot reservoir of the engine?
Total calories burned = ?
f he/she just sleep 5 hours, how many calories burned?
How much heat is needed to change the temperature of a 2.0 kg of block of copper from 10°C to 140°C?
in a uniform electric field near the surface of earth, a particule having a charge of -2.0*10^-9C is acted on by a downward electric force of 3.0*10^-6N,
1. What is the magnitude and direction of the electric force exerted on a proton placed in the field?
2. What is the gravitational force on the proton?
3. What is the ratio of the electric force to the gravitational force in the case
in a uniform electric field near the surface of earth, a particule having a charge of -2.0*10^-9C is acted on by a downward electric force of 3.0*10^-6N, what is the magnitude of the electric field
A football is kicked with a velocity of 20 m/s at an angle of 37° with the horizontal. Determine:
a. Maximum height reached by the ball
b. Time of flight
c. Horizontal distance traveled
