hassanaliali03464279183

PLS ANSWER IMMEDIATLY

1. One isotope of Br has a half-life of 16.5 hours. How much of a 2.00-gram sample remains at the end of 1.00 day?

2. The symbol for an electron also used to represent a(n)

   1. a) Alpha particle
   2. b) Beta particle
   3. c) Positron
   4. b) Gamma-ray

3. The half-life of a radioactive isotope

   1. a) Changes over time
   2. b) Is Constant
   3. c) Is a characteristic of stable isotopes
   4. d) Decreases in value as time passes

A 60.0 kgkg crate of tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it, and the crate just begins to move when your force exceeds 313 NN. Then you must reduce your push to 208 NN. to keep it moving at a steady 25.0 cm/scm/s.

4) The brakes on your car can slow you at a rate of 5.2 m/s?. If you are going 137 km/h and suddenly see a state trooper, what is the minimum time in which you can get your car under the 90 km/h speed limit? (The answer reveals the futility of braking to keep your high speed from being detected with a radar or laser gun.)

The ship you are controlling has landed on a Kuiper Belt Object and collected some samples. It is now time to take off from the object with enough speed that you are able to escape from the body and get positioned for further scientific studies.

Your ship has a mass of 602 kg.

The object the ship is on has a radius of 63 km and has a density of 1993 kg/m^3.

When you are ready to make your prediction, click on the end button.

what  is heat?