Answer:
C down
Explanation:
The ball is pulling the spring down so this must be the direction of the force
The answer is it will supply 1.1 x 10⁹ J of energy each second.
we can calculate this by using the following equation;
P = W/t
<span>W = P x t
</span><span>and by work energy relation;
E = W = P x t
</span>1 watt = 1j/s
1megawatt = 1000000 = 10⁶ j/s
<span>E = 1100 x 106 x 1 </span>
E = 1.1 x 10⁹ J
Answer:
Work by normal force is 1335 J
Work by frictional force is -796.8 J
Explanation:
Work done due to applied force is given by the product of magnitude of force and distance pushed.
Work done=Fd
Substituting 178 N for F and 7.5 m for d then
Work done by normal force=178*7.5=1335 J
Work done due to frictional force will be product of normal force, distance and coefficient of kinetic friction.
Work due to frictional force is -0.19*57*9.81*7.5=-796.81725 J
The normal and gravity forces do not work since they are at 90 degrees.
Free fall distance h
122.583
m
Free fall velocity v
49.0333
m/s
=
176.52
km/h
Answer:
Explanation:
The original frequency of sound being emitted f₀ = 1800
Its velocity towards the observer v ( let )
Apparent frequency f = 2130
velocity of sound = V
Placing the given values
1.1833 =
1.1833 v = 62.87
v = 53.13 m /s .
b ) In the second case
formula for apparent frequency
Substituting the values
= 2458 Hz .