1. Which of the following is a scientific statement? ( B or E) a. People in Fran
ID: 1771734 • Letter: 1
Question
1.Which of the following is a scientific statement? (B or E)
a. People in France don’t understand good music. not answer
b. The Ivory billed woodpecker is extinct. If it can be tested???
c. The Mona Lisa, a painting by Leonardo DaVinci is the best ever created. opinion not answer
d. there are parts of the universe that will never be found by man. not testable cant be answer
e. none of these.
2. You are on a two-lane highway traveling at 60 mph, and a car is approaching you at 55 mph. What is the relative speed between you?
a. 60 mph
b. 5 mph
c. -5 mph
d. 115 mph
e. none of the above.
are velocities canceling out or adding to make big velocity?
3. A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, its vertical component of velocity
a. increases.
b. remains unchanged.
c. decreases.
4. Which of the following is correct?
a. All points on a rotating disk experience the same radial acceleration.
b. All points on a rotating disk have the same angular velocity.
c. All points on a car tire have zero acceleration if the car is moving with constant
linear velocity
d. The vector sum of the tangential acceleration and the centripetal acceleration
can be zero for a point on a rotating disk.
e. All points on a rotating disk have the same linear speed.
5. A bug sits on a phonograph record that is rotating at a constant speed. What will happen to the bug’s acceleration if the rotation speed is doubled?
a. It stays the same.
b. It increases by two.
c. It increases by four.
d. It decreases by two.
e. It decreases by four.
6. A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet moving downward in m/s2 is
a. less than 9.8
b. 9.8
c. more than 9.8.
If there is no ari resistence cant it be more than 9.8 never hitting terminal velocity , no resistence???
7. Galileo’s use of inclined planes allowed him to effectively
a. slow down the acceleration of free fall.
b. Increase the acceleration beyond that of free fall.
c. Eliminate the acceleration of free fall.
d. all of these.
8.If the bullets were not identical, but rather the dropped bullet had twice the mass of the other, which bullet would hit the ground first?
a.The bullet what was fired.
b..the bullet that was dropped
c.. it will be a tie
d.The question can’t be answered with the information given.
Please label numbers in answer and look at what i wrote in bold as i am close but narrowing down a few
Thank you
Explanation / Answer
1.
Option ( D) is correct scientific statement.
2.
Relative velocity will be sum of both vehicle .
Option (D=115 mph) is correct.
3.
The vertical velocity always decrease when projectile rises.
Option (c) is correct
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