200mg of uranium-238 has a half life of 4.5 billion years

How much will be left after 13.5 billion years

A helicopter blade spins at exactly 100 revolutions per minute. Its tip is 5.00 m from the center of rotation. (a) Calculate the average speed of the blade tip in the helicopter's frame of reference.

What is the theory of plate tectonics?

Is it C? One alternative to burning non-renewable fuels, which harm the environment, could be to burn biomass. coal. natural gas. petroleum.

What is a wavelength? a. the highest part of the wave b. the distance between two wave troughs c. the speed of energy of the wave d. the lowest part of the wave

A piano with a mass of 130 kg is lifted 10m above the ground in 5 s by a crane. What is the power used by the crane, measured in watt?

Explain the relationship between speed, velocity and acceleration

What are the characteristics of prokaryotes? A.) A prokaryote lacks a well-defined nucleus. B.) A prokaryote cannot perform basic life functions. C.) A prokaryote lacks cell organelles. D.) A prokaryote is larger than a eukaryote.

In a perfectly inelastic collision, the total momentum of the system ___ (i) ___ constant, while the total kinetic energy of the system___ (ii) ___constant.

What factors determine power

Superman, with a mass of 150kg, goes into outer space to push a 125000kg alien spaceship out of stationary orbit. He uses his super strength and pushes the ship away ay at speed of 150m/s. What is the speed of Superman after his big push