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A car runs at a constant speed of 15m/s for 300 second and then accelerate uniformly to a speed of 25m/s over a period of 20 second.this speed is maintained for 300 seconds before the car is brought to rest with uniform deceleration in 30 second
Draw the graph
- Three lamps are rated 100 W, 50 W, and 10 W If each lamp is connected to a 220-V source, calculate the (a) current through each lamp and (b) resistance through each lamp.
- The resistance of a bulb is 50Ω. What is the current produced by a 24-V battery in the bulb? How many electrons does this current represent?
A person plugged in a 1250 W hair dryer and a 2500 W electric heater in the same 120 V outlet
protected by a 7.5 A circuit breaker. Will the breaker trip?
A cell has a terminal voltage of 50.0 V for a current of 10.0 A and 54 V for a current of 6.0 A. Find the electromotive force and internal resistance of the cell.
Two charges Q1=5nc and Q2=-7nc are separated by 8 cm. Calculate the electric potential at point A
calculate the capacitance of a capacitor if it stores a charge of 2.3x10-4 when delivered with a voltage of 4x103V
A 6 ft 160 pound man was exposed to mercury. A vial of blood was taken for testing. The result was 0.005milligrams of mercury was found in the test sample. How much mercury was found in the while body.
A proton is located at the point (x = 1.0 nanometres, y = 0.0 nanometres) and an electron is
located at the point (x = 0.0 nanometres, y = 4.0 nanometres). Find the magnitude of the
electrostatic force that each one exerts on the other. (k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2, e = 1.6
× 10-19 C)
what is electric field?
A body of mass 25 kg moving at 3 m per second on a rough horizontal floor is brought to rest after sliding through a distance of 2.5 m on the floor. Calculate the coefficient of sliding friction (g=10.0ms-2)
