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A 0.954-kg toy car is powered by 2 C cells (3.00V total) connected directly to a small DC motor. The car has an effective energy conversion efficiency of 52.6%, meaning that 52.6% of the electric energy applied to the motor is converted into translational kinetic energy. After 5.69 seconds, the car, which is initially at rest, reaches a speed of 1.27 m/s. What is the average current supplied to the car\'s motor?
The lower weight is a light bag filled with sand. Assume a pin pokes a hole in the bag and the sand slowly leaks out while the puck is revolving. What would be the puck's speed after all of the sand is gone.
What is the net force exerted by these two charges on the third charge = 46.5 placed between and at = -1.235 ? Your answer may be positive or negative, depending on direction of the force.
A coil of 15 turns and radius 10.0 cm surrounds a long solenoid of radius 2.00 cm and 1000 turns/meter. The current in the solenoid changes as I = (5.00 A) sin(120t). Find the induced emf in the 15-turn coil as a function of time.
four charges, q1=1.5 nC, q2=4nC, q3=20nC and q4=-1nC are placed so that q4=(0,0) q1 is north of q4 and .5m away q2 is east of q4 and 1.0m away q3 is SW of q4 at angle of 36.9 degrees
An electric dipole of dipole moment 4.5 x 10-9 C·m is in a 250 N/C electric field, what is the potential energy
Utilizing an information provided in your course text, complete the "Motivation Concepts Table." This table will serve as a convenient quick reference for the remainder of the course.
A woman is reported to have fallen 139 ft from a building, landing on a metal ventilator box, which she crushed to a depth of 30 in. She suffered only minor injuries.
What is the minimum soap-film thickness (n = 1.33) in air that will produce constructive interference in reflection for red (? = 644nm ) light
At rest, a car's horn sounds at a frequency of 480 Hz. The horn is sounded while the car is moving down the street. A bicyclist moving in the same direction with one-third the car's speed hears a frequency of 470 Hz. What is the speed of the car?
A second baseman tosses the ball to first baseman, which catches it at the same level from which it was thrown. The throw is made with an initial speed of 15 m/s at an angle of 38.0^circ above the horizontal. What is the horizontal component of ba..
find the angular speed after the grindstone. what must be its minimum mass so that material on its surface remains in place during the rapid rotation.
What is an acceleration of two falling sky divers (mass 100.0 kg including parachute) when the upward force of air resistance is equivalent to one-fourth of their weight. How fast would the father be moving.
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