#1 Lose the apostrophes
1a, 1b look good
1c cannot be right, since m/s is not acceleration.
#2 all ok
#3 is (a) - speed has no direction.
(c) is for velocity
#4. Not sure what 60° NE means.
I know N 60° E and E 60° N.
In any case, draw the direction and take the horizontal component, using sine or cosine as appropriate.
Could someone check these practice test questions over for me? I'm not good at physics at all, so I would love an explanation.
1. A projectile is shot an angle into the air. Neglecting air resistance...
1a. It's horizontal acceleration is
a) 9.8 m/s^2
b) 0.0 m/s^2 ***
c) 10 m/s
1b. It's downward acceleration is
a) 9.8 m/s^2 ***
b) 0.0 m/s^2
c) 10 m/s
1c. It's vertical acceleration is
a) 9.8 m/s^2
b) 0.0 m/s^2
c) 10 m/s ***
2. Choose the right answer each matching case below:
2a. The rate of change of velocity is
a) velocity
b) speed
c) time
d) acceleration ***
e) distance
f) gravity
2b. The rate of change of anything is always with respect to
a) velocity
b) speed
c) time ***
d) acceleration
e) distance
f) gravity
2c. The rate of change of displacement is
a) velocity ***
b) speed
c) time
d) acceleration
e) distance
f) gravity
3. The units of speed are:
a) m/s
b) m/s^2 and direction
c) N
d) m/s and direction ***
4. The displacement of an airplane from its starting point is 200 km at 60 degrees NE. Its easterly component is:
a) 173.2 km
b) 200 km
c) 100 km
1 answer
0 answers