Top answers

If Jessica weighs 45kg and sits on a seesaw at a distance of 2m from the centre of the seesaw.Micheal weighs 90kg. At what point on the opposite side should Micheal sit in order to balance the seesaw.

Micheal should sit at a distance of 1m from the pivot or half whatever distance Jessica sits. This is found intuitively here but can be found with any two masses by resolving moments.
HP
Answered by Hugh P. • Physics tutor
1724 Views

A car is travelling at 10m/s. It then accelerates at a constant rate.Find the time taken for the car to travel 1km if the car’s final velocity is then 22m/s .

s=((u+v)/2)t1000=((10+22)/2)t1000=(16)tt= 62.5s
MW
Answered by Mark W. • Physics tutor
2806 Views

How is a PET scanner able to locate a tumour in the patient's body?

The patient is injected with a radioactive isotope with short half-life, for eg Fluorine-18. This isotope decays into positrons. The area damaged with tumour requires more blood supply compared to the health...
KD
Answered by Krish D. • Physics tutor
3908 Views

What is meant by terminal velocity?

Essentially that objects have a top speed falling through air to the ground, which is called terminal velocity. This is because we are surrounded by air, so when moving, objects have to push past the air par...
WC
Answered by William C. • Physics tutor
5041 Views

X-rays and gamma rays have different uses. Describe one use for X-rays and one use for gamma rays.

X-rays can be used to look at skeletons and find out whether a bone is broken. Gamma rays can be used to sterilise things such as food and medical equipment.
MR
Answered by Matt R. • Physics tutor
1944 Views