Physics 1401

If you complete all of the online quizzes during the semester, you may replace your lowest two in-class quizzes with the highest average of all your online quizzes. Since you may take the online quizzes as often as you like, your highest average should be pretty good. However, in order to keep track, you must fill out the student name and id# part of the form.

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) 2X10¹³    (b) 2X10¹¹    (c) 2X10⁹    (d) 2X10⁷    (e) 2X10⁵

 

 

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. According to a recent intelligence estimate, America is least likely to be attacked by terrorists using

(a) airplanes     (b) cars/trucks     (c) ships     (d) the U.S. mail     (e) an I.C.B.M.

 

 

Question 5. As a country, we are spending (by far) the most money to defend against a terrorist attack by

(a) airplanes     (b) cars/trucks     (c) ships     (d) the U.S. mail     (e) an I.C.B.M.

 

 

Question 6. 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 7. 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 8. 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