A football is thrown straight up with a speed of 784 m/s where the average gravitational field intensity g is 9.70 N/kg [down]. In the absence of air friction due to wind resistance, how long (in seconds) would it take the football to slow down to a velocity of 49.0 m/s [up]?
v1
784
g
-9.70
v2
49.0
t
A stone is thrown straight down at 1400 m/s from a bridge over a river. It takes 11.00 s to reach the water. How fast (in m/s [down]) will it be going when it gets there (g = 9.750 N/kg [down])?
v1
1400
t
11.00
g
9.750
v2
An astronaut on the Moon, where g = 1.60 m/s^2 [down], throws a golf ball in the upward direction with a speed of 240 m/s. How long (in seconds) will it be before it almost reaches the top of its flight (when v2 = 1.00m/s)?
g
-1.60
v1
240
v2
1.00
t
A diver plummets with a downward velocity from a 45.0 km diving board. What is her initial velocity (in m/s [down]) if she stays in the air for 1.60 minutes before she reaches the water (g = 9.600 N/kg [down])?
d
45000
t
96.000
g
9.8000
v1
A soccer ball is kicked straight up with a speed of 1.5 km/s. What will its displacement (in metres [up]) be after 20 s (g = 9.800 N/kg [down])?
v1
1500
t
20.00
g
-9.800
d
A worker drops a wrench from the top of a building under construction. If the average gravitational field intensity is 9.50 N/kg [down], after 70.0 s, what is the displacement (in metres [down]) of the wrench?
v1
0.00
g
9.50
t
70.0
d
A worker throws a wrench from the top of a building under construction at 500 m/s. If the average gravitational field intensity is 9.50 N/kg [down], after 70.0 s, what is the final velocity (in m/s [down]) of the wrench?
v1
500
g
9.50
t
70.0
v2
A ball is dropped from the top of a 10.0 km high cliff. What is the ball's velocity (in m/s [down]) after falling for 40 s if the gravitational field intensity is 9.80 N/kg [down]?
v1
0.00
g
9.80
t
40.0
v2
A man falls 12 km to the ground from the top of a ladder. If he is accelerated downward with an acceleration of 10 m/s^2, calculate how long (in seconds) he is in the air.
d
12000.0
v1
0.00000
v2
120000
t
A man falls 24 km to the ground from the top of a ladder. If he is accelerated downward with an acceleration of 10 m/s^2, calculate his velocity (in m/s [down]) when he hits the ground.
d
24000
a
10.000
v1
0.0000
v2
A stone is projected vertically downward from the edge of a cliff 25.0 km high, with an initial speed of 50 m/s. How long (in seconds) will it take to reach the ground assuming the acceleration due to gravity is 9.700 m/s^2?
d
25000.0
v1
50.0000
v2
242550
t
A stone is projected vertically downward from the edge of a cliff 50.0 km high, with an initial speed of 50 m/s. What will be its velocity (in m/s [down]) at the time of impact assuming the acceleration due to gravity is 9.600 m/s^2?
d
50000
v1
50.000
a
9.60000
v2
You see a Peregrine Falcon plummeting (free falling) toward the Earth at 180km/h. What would be its velocity after 100 s (in m/s [down]) assuming g = 9.50 N/kg [down]?
v1
50.0
t
100
g
9.50
v2
If you see a coin free falling at 14.0 km above the ground, what time (in seconds) will the coin reach the ground if the initial velocity is 100 m/s and the gravitational field intensity is 9.75 [down]?
d
14000
v1
100.00
g
9.7500
t
What is the force of gravity (in N/kg [down]) on an elephant with a mass of 1.365 kg?
m
1.365
g
9.800
Fg
Calculate the mass (in kg) of an object on Earth if the downward force of gravity on it is 1.2 x 10^3 N.
Fg
1200
g
9.800
m
What is the gravitational field intensity (in N/kg [down]) of the location if a man's mass is 91.0 kg his weight is 900 N.
m
91.0
Fg
900
g
The average radius of Earth is about 6.40 x 10^3 km. What is the force of gravity (in N [down]) acting on an 80.0kg astronaut in orbit 3.20 x 10^4 km from the centre of Earth?
m
80.0
g
0.392
Fg
The highest satellites are about 6.6 Earth radii (one Earth radii = 6.40 x 10^3 km) from the centre of the Earth. What would be the force of gravity (in N [down]) be on a 70 kg astronaut at this location?
m
70.0
g
0.225
Fg
At the top of Mount Robson in British Columbia, the force of gravity on a 7.50 kg turkey is 73.6 N [down]. Calculate the gravitational field intensity (in m/s^2 [down]) at this location.
m
7.50
Fg
73.6
g
Calculate the force of gravity (in N [down]) on a 70 kg astronaut 2.0 Earth radii (one Earth radii = 6.40 x 10^3 km) from the centre of Earth.
m
700
g
2.45
Fg
Calculate the force of gravity (in N [down]) on an 80 kg astronaut in a space capsule where the acceleration due to gravity is 1.10 m/s^2 [down].
m
80.0
g
1.10
Fg
The force of gravity on a 5.0 kg boulder on the planet Uranus is 41 N [down]. What is the acceleration due to gravity on Uranus?
m
5.0
Fg
41
g
The force of gravity on a video camera out in space is 29.7 N [down]. What is the mass (in kg) of the camera if its acceleration in free fall is 3.30 m/s^2 [down]?
Fg
29.7
g
3.30
m