calculate the time taken to raise the temperature of 1.5 kg of water in a kettle from 15°C to 100°C given that specific heat capacity of water is 4200 J/kg/K and the heater is rated 250V, 2kW

A runner starts from rest and accelerates uniformly to a speed of 8.0 meters per second in 4.0 seconds. The magnitude of the acceleration of the runner is O 32 m/s/s o 9.8 m/s/s O 2.0 m/s/s O 0.50 m/s/s

Two students are discussing the Sun. Which student is correct? Student 1: Nuclear fusion powers the Sun, so activity like sunspots and flares must be caused by a change in the fusion rate or the type of fusion.

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? 1 - positive 2 - negative 3 - zore

Two red blood cells each have a mass of 9.0*10-14 kg and carry a negative charge spread uniformly over their surfaces. The repulsion arising from the excess charge prevents the cells from clumping together. One cell carries - 2.

The force between two magnetic poles will increase as their separation is increased. true or false?

What effect does a doubling of the mass have upon the acceleration of the object? Be quantitative.

What type of intermolecular forces would you expect to find in a pure liquid sample of carbon tetrachloride?

Describe how rockets lift off.

Which of the pollutants shown in Figure 4-2 are considered to contribute to the pollution problem known as acid precipitation?

A billiards ball B rests on a horizontal surface and is struck by another billiards ball A of the same mass m = 0.2 kg. Ball A is initially moving at 18 m/s and is deflected 28° from its original direction. Assume the collision is elastic.