Physics Answers

What happens if the filament of a single bulb fails (or if the bulb is removed from its socket)? Why?

A golf ball is driven with an initial velocity of 161 fps

upward at 30 ̊ to the horizontal from an elevated tee

64.4 feet above a level fairway. What horizontal

distance will the ball travel before hitting the fairway

a box starting from rest and slides down an inclined plane with uniform acceleration and travels 9 m in 3 s. in what time from rest will it acquires a velocity of 24m/s down the plane

1. A boy wants to throw a water balloon from a roof deck at a height of 3m from the street and hit the far side of the street. He throws the ball at 5 m/s at an angle of 45° to the horizontal. If Vboy = 0, what is the maximum height, h, reached by the balloon above the street?

A. h= 5.9 m B. h = 5.1 m C. h = 3.6 m D. h= 4.6 m

2.This time, suppose the boy gets a running start, vboy = 5m/s toward the street. What is the speed of the balloon, V balloon, when it hits the street

Assuming that a kilogram rat and a hundred kilograms elephant fell on the cliff at the same time, which of the two will reach the ground first if air resistance and surface area are neglected? Explain.

How does an electromotive force differ from a potential difference?

1.5 kg of liquid having a constant specific heat of 2.5 kJ/kg K is stirred in a well-insulated chamber causing the

temperature to rise by 15°C. Find ΔE and W for the process

A potential difference of 250V is applied to a field winding at 15°C and the current is 5A. What will the temperature of the winding when current has fallen to 3.91A, applied voltage being constant. Assume delta15=0.00393/°C

A platinum coil has a resistance of 3.146ohms at 40°C and 3.767 ohms at 100°C. Find the resistance at 0°C and the temperature coefficient of resistance at 40°C

Two parallel straight wires 10.0 cm apart carry currents in opposite directions (Fig. 20–24). Current I_1=5.0 A is out of the page, and I_2=7.0 A is into the page. Determine the magnitude and direction of the magnetic field halfway between the two wires.