Ocean waves travel through the medium called
"ocean water" or "salt water" or simply "water".
Answer:
a. 120 W
b. 28.8 N
Explanation:
To a good approximate, the only external force that does work on a cyclist moving on level ground is the force of air resistance. Suppose a cyclist is traveling at 15 km/h on level ground. Assume he is using 480 W of metabolic power.
a. Estimate the amount of power he uses for forward motion.
b. How much force must he exert to overcome the force of air resistance?
(a)
He is 25% efficient, therefore the cyclist will be expending 25% of his power to drive the bicycle forward
Power = efficiency X metabolic power
= 0.25 X 480
= 120 W
(b)
power if force times the velocity
P = Fv
convert 15 km/h to m/s
v = 15 kmph = 4.166 m/s
F = P/v
= 120/4.166
= 28.8 N
definition of terms
power is the rate at which work is done
force is that which changes a body's state of rest or uniform motion in a straight line
velocity is the change in displacement per unit time.
Answer:
The correct option is C
Explanation:
From the question we are told that
The distance between axles of the car is 
The position of the car's center of mass is 
Now we can evaluate the distance of the center of mass to the rear axle as follows
substituting values
assuming the car is at equilibrium, taking moment about the center of mass
=> 
=> 
substituting values
Note [
is the front axle weight and
is the rear axle weight ]
False because they let it in to the atmosphere and then its condenced
