When a living cell doubles in diameter, it has eight times the mass to be nourished, and the amount of membrane through which it feeds is
A) only twice as much.
B) only four times as much.
C) also eight times as much.
D) more than eight times as much.
Answer: B
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Indicate whether the statement is true or false
A car traveling 85 km h slows down at a constant 0.50 m/s2 just by “letting up on the gas.” Calculate
(a) the distance the car coasts before it stops, (b) the time it takes to stop, (c) the distance it travels during the first and fifth seconds.
A 1.5-kg cart attached to an ideal spring with a force constant (spring constant) of 20 N/m oscillates on a horizontal, frictionless track. At time t = 0.00 s, the cart is released from rest at position x = 10 cm from the equilibrium position
(a) What is the frequency of the oscillations of the cart? (b) Determine the maximum speed of the cart. Where does the maximum speed occur? (c) Find the maximum acceleration of the mass. Where does the maximum acceleration occur? (d) How much total energy does this oscillating system contain? (e) Express the displacement as a function of time using a cosine function.
A system has an increase in internal energy of 60 J while 90 J was removed from the system by heat. How much work was involved during this process and was it done on the system or done on its environment?
a. 30 J on the system b. 30 J on the environment c. 150 J on the system d. 150 J on the environment