Atomic and Nuclear Physics Answers

Calculate the molar mass of a liquid if 0.995g if it’s vapour occupy 250L at 200 degree cent and 45.0Torr

Activity 3: Gravitational Force

The mass of m1 of one of the small sheres of a Cavendish balance is 0.02 kg, the

mass m2 of the nearest large sphere is 0.065 kg, and the center-to-center distance

between them is 0.04 m. Find the gravitational force Fg on each sphere due to the other.

A 0.15kg tumor is treated with α

α particles. There are 2×10

12

2×1012 particles reaching the tumor every second, each having energy 3×10

−15

3×10−15J. What is the absorbed dose given to the tumor

A 2.0kg piece of meat is treated with 1.5kGy in order to kill bacteria and preserve its shelf life. How much energy is absorbed by the meat?

Cobalt-60 has a half-life of approximately 5 years. If there was one microgram present in a sample originally, how many atoms would have decayed after 20 years?

A 0.15kg tumor is treated with α

α particles. There are 2×10

12

2×1012 particles reaching the tumor every second, each having energy 3×10

−15

3×10−15J. What is the absorbed dose given to the tumor

What absorbed dose of α

α- particles(Q=20) causes as much biological damage as a 100Gy dose of protons(Q=10).

A stone is thrown downward at 30 m/s. What is its speed, [2]

a)after 1s b) after 2s

What is the coefficient of kinetic friction between the 100 N and 39 ⁰

A ball of mass 5 kg is dropped from a height of 1.4 m (from the ground). ) onto a massless spring (a spring with a length balance of 0.5 m). The ball compresses the spring a distance of 0.29 m while at rest. Calculation springs.