Why do scientists believe the universe is still expanding

How does the charge of a particle affect the direction in wich the particles deflected in a megnetic field

If a girl is running along a straight road with a uniform velocity 1.5m/s find her acceleration.

A sample of a radioactive elements must contain atoms A. with a stable nuclei B. with unstable nuclei C. in the excited state D. in the ground state

Scientists began to describe matter as behaving like a wave rather than a particle after they observed which phenomenon? A. The flow of electrons when certain types of light are shined on a metal surface B.

The ozone the unearths surface from the dangerous radiation. This is an interaction between

How would you describe the shape of the trajectory of a projectile

Do metals gain or lose electrons in order to acquire a full octet

D) Explain why a high frequency carrier signal is needed in a communication system.

When approaching an intersection where the traffic signal is out you should?

The law of universal gravitation (gravity) describes two factors that affect the force of gravity between objects. What two factors affect gravity AND how?