Suppose a tennis canon located at ground level fires a ball at a 45 angle to the ground with a speed of 80 feet per second. In calculating the trajectory of the ball you may exclude the effect of air resistance and assume the only force acting on the ball is gravity which accelerates the ball downward at a rate of 32 feet per second.
How high is the ball at its highest point?

a) 20 feet b) 20/2 feet
c) 32 feet d) 50 feet
e) 50/2 feet f) 64 feet
g) 6472 feet
h) 100 feet

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

Two technicians are discussing a resistance measurement between the can-h and can-l wires. technician a says this measurement should be done with the ignition switch in the "run" position. technician b states that a measurement of 0 ohms indicates an open in the network. which technician is correct?