Review of Projectile Motion, Mass

1
Review of Projectile Motion, Mass Weight
2
What is the weight of a 50 kg object near Earth?
Ans. 500 N
3
What is the mass of a 5 kg rock on the Earth?
Ans. 5 kg
4
What is the weight of a 10 kg rock on the
Moon?(g 1.7 m/s2)
Ans. 17 N
5
What is the acceleration?
Ans. 20 m/s2
6
If the object has a mass of 2 kg, what is its
weight?
Ans. 40 N
7
What is the displacement for the first 5 seconds?
Ans. 75 m
8
A man throws a ball vertically upward. What is
its velocity at its highest point?
Ans. zero
9
A man throws a ball vertically upward. What is
its acceleration at its highest point?
Ans. 10 m/s2 downward
10
A man throws a ball vertically upward with an
initial speed of 25 m/s. At what time does it
return to his hand?
Ans. 5 s
11
A man throws a ball vertically upward with an
initial speed of 25 m/s. How high does it go?
Ans. 31.3 m
12
What is the displacement for the first 3 seconds?
Ans. 60 m
13
What is the acceleration?
Ans. zero
14
What is the weight?
45 kg
Ans. 450 N on Earth
15
Planet X has an acceleration due to gravity of
0.1 m/s2. Joe can jump 1 m vertically on Earth.
How high can he jump on Planet X?
Ans. 100 m
16
Planet X has an acceleration due to gravity of
0.1 m/s2. Joe has a mass of 55 kg on Earth.
What is his mass on Planet X?
Ans. 55 kg
17
Joe can lift a mass of 136 kg on Earth. How much
weight is he lifting?
Ans. 1360 N
18
Planet X has an acceleration due to gravity of
0.1 m/s2. Joe can lift a mass of 136 kg on
Earth. How much mass can he lift on Planet X?
Ans. 13600 kg
19
Planet X has an acceleration due to gravity of
0.1 m/s2. Joes workout set of weights has a
mass of 200 kg. What is the weight of the set on
Planet X?
Ans. 20 N
20
The next four slides deal with the same initial
information.
21
What is the initial vertical velocity of the
object?
30 m/s
50?
Ans. 23 m/s
22
What is the time in the air from launch to
landing at same height?
30 m/s
50?
Ans. 4.6 s
23
What is the maximum height reached by the object?
30 m/s
50?
Ans. 26.5 m
24
What is the range for this projectile?
30 m/s
50?
Ans. 88.8 m
25
The following two slides are based on the same
initial information.
26
What is time in air?
15 m/s
y
x
2 m
Dx
Ans. 0.63 s
27
What is Dx?
15 m/s
y
x
2 m
Dx
Ans. 9.5 m
28
The following three slides have the same initial
information.
29
How long will it take boat to cross river?
6 km
12 km/h
B
4 km/h
Ans. ½ h
30
How far downstream will the boat drift?
6 km
12 km/h
B
4 km/h
Ans. 2 km
31
What is the velocity of the boat relative to the
shore?
6 km
12 km/h
B
4 km/h
Ans. 12.6 km/h _at_ 18.4? SE