A red block (mr=2kg) is released from rest and slides down a slope. At the bottom it collided with a blue block (mb=0.5kg). They stick together after the collision. a) what is the velocity of the blocks immediately after the collision?

b) the blocks then slide into a ruff area offering 4N of friction. How many seconds does it take for the blocks to come to a rest?

c) How far has it travelled in the first 3s of moving in the sand zone?

What type of nuclear decay causes the atomic number of an element to increase by 1?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions