A train travels 78 kilometers in 2 hours, and then 60 kilometers in 3 hours. What is its average speed?

It takes 63 W to power a ceiling fan. The energy output of the fan is 50 W. Calculate the efficiency of the fan. Round your answer to the nearest percentage. %

Which change will cause an increase in the electric current produced through electromagnetic induction? using more wire loops in the solenoidusing the opposite pole of the magnetusing a weaker magnetmoving the solenoid slower?

What is the main difference between magma and lava

A ball is dropped from the top of a tall building. Slightly later a second ball is thrown downward and catches up with the first ball.

No interior de um calorímetro de capacidade térmica 6 cal/°C encontram-se 85 g de um líquido a 18°C. Um bloco de cobre de massa 120 g e calor específico 0,094 cal/g°C, aquecido a 100°C, é colocado dentro do calorímetro.

In a classroom, why can we hear the sound waves produced by the teacher talking?

What is the general defination of parallax?

Change in speed over a given period of time is

A car takes 15 minutes to travel along a road that is 20 km long. What is the average speed of the car? A. 75 km/h B. 5.0 km/h C. 80 km/h D. 300 km/h

A 4.2 cm diameter circular loop of wire is in a 1.14 T magnetic field. The loop is removed from the field in 0.18 s. Assume that the loop is perpendicular to the magnetic field. What is the average induced emf?