Please answer this physics question im desperate!! 25 points and brainliest!!
Answers
Answer:
Both types of source consist of an anode, cathode, and electrolyte and transfer energy via electron flow between ions.
Explanation:
Explanation:
A skier of mass 70 kg is pulled up 60 m on a 30° slope by a motor-driven cable with a constant velocity of 2.0 m/s. What power must the motor have to perform this task? The surface is frictionless.
m=70kg,
?x=60m,?=30o,
velocity =2.0 m/s and
W(work)=21kJ here we must convert X 10^3 21000 J.
W=Fcos?(?x)
21=F(cos30)(60)
f= 21000 /(cos30)(60)= (404 N) now this foce
then how do I find the power ?
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2 ) A 50.0 kg student climbs 5.00 m up a rope. Power output is 200.0 W and she stops at the top .
a) How long does it take the student to climb?
b) What must her average speed be in order to match the power output of a 200 W light bulb?
c) How much work does she do?
m = 50.0 kg
D = a5.00 m
w = 200.0 W
a ) Work = Fd = mgd = 50 x 9.8 x 5 = 2450J
Power = Work/time
time = 2450 /200 = 12.25 secs
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3 ) While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 70 kg person develops a power of 78 W during a race, how fast is the person running? (Assume a running step is 1.5 m long.)
m/s