Why don't the two forces in Newton's third law cancel each other?
a. Because they have different magnitudes.
b. Because they act in the same direction.
c. Because they act in different directions.
d. Because they are different kinds of forces.
e. Because they act on two different objects.
e
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The resistivity of a 1.0 m long wire is 1.72 × 10-8 ?m and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire?
A) 17 mV B) 0.90 mV C) 1.7 mV D) 10 mV E) 90 mV
A ball is thrown straight up. It reaches its highest point and then falls back. Which of the following is the correct statement?
A. Throughout its motion, the ball's acceleration is zero B. At the highest point in its motion, the ball's acceleration is zero C. At the highest point in its motion, the ball's velocity and acceleration are zero D. At the highest point in its motion, the ball's velocity is zero E. Throughout its motion, the ball's velocity is zero
Sound cannot travel through solid steel
a. True b. False Indicate whether the statement is true or false
Iced tea is made by adding ice to 3.0 kg of hot tea, initially at 80°C. How many kg of ice, initially at 0°C, are required to bring the mixture to 10°C? (Lf = 3.33 x 105 J/kg, cw = 4186 J/kg•°C)
a. 2.8 kg c. 1.4 kg b. 1.6 kg d. 2.3 kg