There is a 30 g sample of Be-11. It has a half-life of about 14 seconds.

How much will be left after 28 seconds?

A. 3.75 g

B. 7.5 g

C. 15 g

D. 30 g

Which statement describes the magnetic effect of a bar magnet?

A ball is projected vertically upwards with an initial velocity of 'u', goes to a maximum height of 'h' before coming to the ground. What is the value of 'h'?

Sue and Jenny kick a soccer ball at exactly the same time. Sue's foot exerts a force of 52.6 N to the north. Jenny's foot exerts a force of 112.8 N to the east. a) What is the magnitude of the resultant force on the ball? Answer in units of N.

The sound level produced by one singer is 70.8 dB. What would be the sound level produced by a chorus of 37 such singers (all singing at the same intensity at approximately the same distance as the original singer)

X-rays are not part of the electromagnetic spectrum true or false

V is the velocity of a particle moving along the x axis as shown. If x = 2.0 m at t = 1.0 s, what is the position of the particle at t = 6.0 s?

A compound consisting of atoms of small atomic mass is more likely to require

Wave can be described as A. a continuous transmission of energy from one location to the next B. The disturbance of particles in an area C. The transmission of energy through individual particles D. The motion of particles in a medium

A germ is also called a microorganism or a microbe. True False

What is 1.33Ω plus 2Ω?