Suppose several forces are acting upon a mass m. The in = m refers to
A) any particular one of the forces.
B) the vector sum of all the forces.
C) the force of friction acting upon the mass.
D) the arithmetic sum of all the forces.
E) the arithmetic mean of all the forces.
B
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A gasoline engine absorbs 2500 J of heat and performs 1000 J of mechanical work in each cycle. The efficiency of the engine is
a. 80%. b. 40%. c. 60%. d. 20%. e. 50%.
When you quickly jerk a cart forward that has a ball resting in the middle, the
A) front of the cart hits the ball. B) back of the cart hits the ball. C) neither, for the ball rides along in the middle as the cart moves forward. D) All of the above depending on how quickly the cart is pulled.
Accelerate an electron and you produce an electromagnetic wave. Accelerate a massive body and you produce
A) a gravitational wave. B) a cosmic wave. C) both of these D) neither of these
A rod is 2.40 m long and has a diameter of 2.50 mm. A force of 2000 N is applied to the end to stretch the rod by 1.40 mm. What is the tensile modulus for this rod?
a. 
b. 
c. 
d. 
e. 