Force, distance and time
Explanation:
Power is the rate at which work is being done:
Power =
The quantity force x distance is the work done by a body.
Force is the applied pull or push on a body that causes it change position.
It is important to know the work done and the time taken for the work to be done when considering power.
The unit of power is watt or J/s
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Power brainly.com/question/10421964
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Answer:
D. A battery provides electrical energy to power a phone.
Explanation:
Examples of current electricity are starting a car, turning on a light, cooking on an electric stove, watching TV, shaving with an electric razor, playing video games, using a phone, charging a cell phone and more.
Answer:
An object is said to be in motion when it changes its place with time and respect to its surrounding.
Explanation:
Hope this helps :)
Speed = frequency * wavelength
So frequency = speed / wavelength
f = 330 / 0.25
f = 1320 Hz
Answer:
so initial speed of the rock is 30.32 m/s
correct answer is b. 30.3 m/s
Explanation:
given data
h = 15.0m
v = 25m/s
weight of the rock m = 3.00N
solution
we use here work-energy theorem that is express as here
work = change in the kinetic energy ..............................1
so it can be written as
work = force × distance ...................2
and
KE is express as
K.E = 0.5 × m × v²
and it can be written as
F × d = 0.5 × m × (vf)² - (vi)² ......................3
here
m is mass and vi and vf is initial and final velocity
F = mg = m (-9.8) , d = 15 m and v{f} = 25 m/s
so put value in equation 3 we get
m (-9.8) × 15 = 0.5 × m × (25)² - (vi)²
solve it we get
(vi)² = 919
vi = 30.32 m/s
so initial speed of the rock is 30.32 m/s