Section 3.3& 3-14 If a subway train is moving to the left (has a negative velocity)and then comes to a stop, what is the direction of its acceleration? Is the acceleration positive or negative? Not enough information given. The acceleration is to the right and is negative. There is no acceleration The acceleration is to the right and is positive. The acceleration is to the left and is negative. The acceleration is to the left and is positive.

A radioactive compound with mass 240 grams decays at a rate of $30\% $ per hour, Which equation represents how many grams of the compound will remain after 4 hours? Answer $C=240(1.3)^{4}$ $C=240(1-0.3)(1-0.3)$ $C=240(1+0.3)^{4}$ $C=240(0.7)^{4}$

7. Why do you think the plastic and the finger are attracted to each other? Your answer

Which unit would be most useful for describing the distance to a galaxy cluster located from Earth? Light-years Astronomical units Parsecs Kllometers

You can increase pressure by increasing the force applied to a given area True False

An object experiences a buoyant force of 15.9 N when immersed in a fluid of density $917kg/m^{3}$ What is the volume of the object? $[?]m^{3}$

Which of the following is a path function? Pressure $(P)$ Volume $(V)$ Temperature $(T)$ Work $(w)$

Evidence Card G:What is the effect of distance between the car and launcher on the potential energy in the system? Magnets close together Initial potential energy. Number of grid points between magnets: __ Magnets a medium distance apart Initial potential energy. Number of grid points between magnets: __ Magnets far apart Initial potential energy. Number of grid points between magnets __

5. The driver of a train travelling at $40m/s$ applies the brakes as the train enters a station. The train slows down at a rate of $2m/s$ The platform is 400 m long. Will the train stop in time?

The earth's atmosphere exerts a pressure on all objects which it is in contact. True False

Complete the statement. A system's thermal energy is defined as __ . Choose 1 answer: A surroundings (A) the heat that transfers from the system to the B the average kinetic energy of its particles.