a 30kg child who is running at 4m/s jumps onto a stationary 10kg skateboard. what is the approximate speed of the child and skateboard

If you live on the path of a jet stream, will the temperature get hotter or colder?

Two snowy peaks are H = 790 m and h = 750 m above the valley between them. A ski run extends bewteen the peaks, with a total length of 3.1 km and an average slope of? = 30°. (a) A skier starts from rest on the higher peak.

The mass of a high speed train is 4.5*105kg, and it is traveling forward at a velocity of 8.3*101m/s. given that momentum equals mass times velocity, determine the values of m and n when the momentum of the train (in kg⋅m/s) is written in scientific

Electric current where all of the electrons flow in one constant direction?

A wave is propagating from left to right in a medium. The particles in the medium are also vibrating from left to right. What kind of wave does this describe? longitudinal wave transverse wave mechanical wave electromagnetic wave

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine

Why do you float in space

How does physical change affect the identity of a substance

A scientist pours grape juice on three identical white shirts He then uses three different cleaning products on the shirts and measures how clean they get what is the independent variable in this experiment

What part of the atom does nuclear radiation come from?