Physics 1401
Online Quiz 1
Chapters 1 and 2 in
Conceptual Physics
12th edition
Question 1.
Part of the scientific method involves formulating a
scientific
(or testable) hypothesis. This means that the hypothesis is
(a) definitely true.
(b) probably true.
(c) capable of being proved true, but not false.
(d) probably a bad idea.
(e) capable of being proved true or false by experiment.
Question 2.
A reasonable order-of-magnitude estimate for the number of times that a heart beats in an average human lifetime of 70 years is
(a) 2X10
13
(b) 2X10
11
(c) 2X10
9
(d) 2X10
7
(e) 2X10
5
Question 3.
In any given year, the outcome that is
less
likely than being struck by lightning is
(a) a fatal bicycle crash
(b) drowning
(c) choking to death
(d) winning the state lottery
(e) death by car crash
Question 4.
A cart is pulled to the right with a force of 100 N and to the left with a force of 20 N. The net force on the cart (in N) is
(a) 10 right
(b) 30 left
(c) 50 left
(d) 80 right
(e) 120 right
Question 5.
A 50 kg crate rests on a horizontal floor. If a force of 150 N to the right is exerted on the crate but it doesn't move, then the force of friction (in N) is
(a) 0
(b) 500 left
(c) 500 right
(d) 150 right
(e) 150 left
Question 6.
The force on the crate from the previous question is increased to 250 N to the right so that the crate moves with constant velocity. The net force (in N) on the crate is
(a) 0
(b) 500 left
(c) 500 right
(d) 250 right
(e) 250 left
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