Potential difference across each lightbulb
How many 92 W lightbulbs can you use in a 130 V circuit without tripping a 17 A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each lightbulb is 130 V.)
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Mars Rover When the Mars rover was deployed on the surface of Mars in July 1997, radio signals took about 12 {rm min} to travel from Earth to the rover. How far was Mars from Earth at that time?
A horizontal board 7.0 m long is used by pirates to make their victims walk the plank. A pirate of mass 105 kg stands on the shipboard end of the plank to prevent it from tipping. Find the maximum distance if the mass of the plank is 26 kg.
The arm contains 150 cm3 of blood with a concentration of 2.50×1020 Na+ ions per cubic centimetre. If no other ions were present in the arm, what would be the magnetic force on the arm?
A boat heading due North crosses a 168-m wide river with a speed of 10.0 km/h relative to the water. The water in the river has a uniform speed of 5.00 km/h and flows due East.
What distance does the car cover in the first 4 seconds and the last 2 seconds of motion? What is the constant speed V that characterizes the middle portion of its motion?
A solid cylindrical disk has a radius of 0.13 m. It is mounted to an axle that is perpendicular to the circular end of the disk at its center. When a 50-N force is applied tangentially to the disk, perpendicular to the radius, the disk acquires an
A grinding wheel is spun up to a speed by a motor that produces constant power. It takes time t to reach an angular velocity w. Assuming negligible friction at the axle, how long does it take to reach twice this angular velocity?
An electron is projected vertically upward with a speed of 1.65x10^6 m/s into a uniform magnetic field of 0.180 T that is directed horizontally away from the observer. What will the radius of the circle be?
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