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

A system of two charges has a potential energy of - 5 joules. Which of the following is a possible potential energy for the system after it has been permitted to accelerate for a few seconds?

The mass of the parts is always ___ the mass of the whole when looking at nuclear masses.

The shape that has the least friction in air is _ A) round B) streamlined C) square D) oblong

A 385-g tile hangs from one end of a string that goes over a pulley with a moment of inertia of 0.0125 kg ⋅ m2 and a radius of 15.0 cm. A mass of 710 g hangs from the other end of the string.

A sample of marble has a volume of 6cm3 and density of 2.76 G / cm3 what is its mass

Which of the following occurs in meiosis that does not occur in mitosis 1 fertilization occur 2 body cells are made 3 sex cells are made 4 cell division occurs

A hot air balloon is hovering in the air when it drops a 40 Kg food package to some lost golfers. If the package is dropped from an altitude of 500 m and air resistance can be neglected, how fast is the package moving when it hits the ground?

you often hear people particularly TV announcers talk about "high rate of speed" what do you think they mean according to the specifics of physics definitions what are they really saying

What is the value of x in the equation Ix - 3y = 30, when y = 15?

32. How much work is done pushing an 80 N box 2 m across ue surtout What work is done? a. 40 J c. 160 J b. 20 J d. 240 J