Top answers

Why does resistance increase with temperature?

So, when an electrical charge passes through a resistor, some of that electrical energy is transferred into heat, increasing the temperature. This extra energy causes the particles in the resistor to vibrate...
FF
Answered by Fergus F. • Physics tutor
53183 Views

Sophia (mass 47Kg) is travelling to the right with a velocity of 7.2m/s and ​Neesha (mass 68Kg) is travelling to the left with a velocity 4.8m/s. When ​they meet, they hold hands and travel off together. Give their final ​velocity and direction

We know that p=mv, So Sophia travels at 7.2 m/s and she has a mass of 47kg so her p is: p=7.2 x 47=338.4 kgm/s Neesha travels with a velocity of -4.8 m/s and she has mass of 68kg, so her p is: p= -4.8 x 68= ...
RL
Answered by Raquel L. • Physics tutor
4755 Views

A sound wave has a frequency of 500 Hz. The sound wave has a wavelength of 0.34 m in air. Calculate the speed of the sound wave in air?

As we know so far, c = f / λ. This equation comes from a much simpler version of speed = distance/ time. As the λ (with units "m") can be seen as distance and the frequency (with units "1/s&qu...
RA
Answered by Reni A. • Physics tutor
18358 Views

Define the term ultrasound wave

An ultrasound wave is a soundwave with a frequency higher than 20,000 Hz
RA
Answered by Reni A. • Physics tutor
4930 Views

Insulating a home costs £2000 and saves £50 a year. What is the payback time?

40 years.
LT
Answered by Leo T. • Physics tutor
4462 Views