13200N
Explanation:
Given parameters:
Mass = 1100kg
Velocity = 24m/s
time = 2s
unknown:
Braking force = ?
Solution:
The braking force is the force needed to stop the car from moving.
Force = ma =
m is the mass of the car
v is the velocity
t is the time taken
Force = = 13200N
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consider the motion when Jim travels by bicycle
D = total distance to be traveled for the trip = 153 mile
v = speed of riding = 42 mph
t = time taken to complete the trip by bicycle = ?
using the equation
t = D/ v
inserting the values
t = 153/42
t = 3.64 h
while walking and riding :
T = total time taken to complete the trip by walking and riding = 5 hours
t ' = time of walking = T - t = 5 - 3.64 = 1.36 hours
v' = speed of walking = 4 mph
d' = distance traveled by walking = ?
distance traveled by walking is given as
d' = v' t'
d' = 4 x 1.36
d' = 5.44 miles
d = distance traveled by bicycle = D - d' = 153 - 5.44 = 147.56 miles
v = speed of riding = 42 mph
t = time spent on the bicycle = ?
time spent on the bicycle is given as
t = d/v
t = 147.56/42
t = 3.51 hours
Answer:
D. The liquid is a mixture because it has a gas dissolved in a liquid.
The work done is
Work Done = Change in Kinetic Energy (ΔKE)
<u>Explanation</u>
In first 1 hour it travels 72 km
So, Velocity =
or, Initial Velocity (u) = 20 m/s
Similarly for the next hour it covers 90 km
So, Velocity =
or, Final Velocity (v) = 20 m/s
Work done = Change in Kinetic Energy (ΔKE)
Work done = ΔKE =
ΔKE =
= = 281250 joule
=
Answer:
wasts materials such as cans. it can hit space crafts and satellites. no one has ever been killed by space debris, space vessels very rarely are seriously damaged.