3 years ago

21. True or false: During heat transfer heat always travels from the warmer object to the cooler object.

1 answer:

4 0

Answer: True

When 2 things are at different temperatures and they touch eachother, the heat flows from the warmer object to the cooler one.

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A weightlifter lifts a 250-kg mass 0.5 meters above his head, how much PEg does the mass have (Note: g=9.8 m/s2)? Round your ans

Anna71 [15]

The Gravitationa potential energy of the mass (PEG) is given by:
$U=mgh$
where
m is the mass
g is the gravitational acceleration
h is the heigth of the mass above the reference level (the ground)

In this problem, $m=250 kg$ and $h=0.5 m$ , therefore the gravitational potential energy of the mass is:
$U=mgh=(250 kg)(9.8 m/s^2)(0.5 m)=1225 J$

6 0

4 years ago

Read 2 more answers

A pendulum makes 60 vibrations in 15 secs what’s its frequency

o-na [289]

Answer:

4 hertz

Explanation:

The defination of freqyency = the total no of cycle made by a wave in one second .

so,

cycle or vibrations=60

tame taken = 15