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3 years ago

What is the potential energy of a 5kg rock that is 7m high on a hill

Physics

1 answer:

Goryan [66]3 years ago

4 0

Explanation:

Gravitational potential energy = mgh = (5)(9.81)(7) = 343.35J.

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A 275-g sample of nickel at 100.0°C is placed in 100.0 mL of water at 22.0°C. What is the final temperature of the water? Assume

Mademuasel [1]

Answer:

39.6138 °C

Explanation:

Heat gain by water = Heat lost by nickel

Thus,

$m_{water}\times C_{water}\times (T_f-T_i)=-m_{nickel}\times C_{nickel}\times (T_f-T_i)$

Where, negative sign signifies heat loss

Or,

$m_{water}\times C_{water}\times (T_f-T_i)=m_{nickel}\times C_{nickel}\times (T_i-T_f)$

For water:

Volume = 100.0 mL

Density of water= 1 g/mL

So, mass of the water:

$Mass\ of\ water=Density \times {Volume\ of\ water}$

$Mass\ of\ water=1 g/mL \times {100.0\ mL}$

Mass of water = 100 g

Initial temperature = 22.0 °C

Specific heat of water = 4.186 J/g°C

For nickel:

Mass = 275 g

Initial temperature = 100 °C

Specific heat of nickel = 0.444 J/gK = 0.444 J/g°C

So,

$100\times 4.186\times (T_f-22.0)=275\times 0.444\times (100-T_f)$

$418.6\times (T_f-22.0)=122.1\times (100-T_f)$

$418.6\times T_f+122.1\times T_f=21419.2$

$T_f=39.6138\ ^{0}C$

Thus,

The final temperature of the combined metals is 39.6138 °C

4 0

3 years ago

Read 2 more answers

I need help with number 7 and 8. Gravity is 10N NOT 9.8N for these problems

noname [10]

7A 8A maybe I’m not sure sorry if it’s wrong.

8 0

3 years ago

A car has a mass of 1600 kg. It is stuck in the snow and is being pulled out by a cable that applies a force of 7560 N due north

sergiy2304 [10]

Answer:

Acceleration of the car will be $a=0.1375m/sec^2$

Explanation:

We have given mass of the ball m = 1600 kg

Force in north direction F= 7560 N

Resistance force which opposes the movement of car $F_R=7340N$

So net force on the car $F_{net}=F-F_R=7560-7340=220N$

According to second law of motion we know that F=ma

So $220=1600\times a$

$a=0.1375m/sec^2$

7 0

3 years ago

Blood borne pathogens can be transmitted between persons through

Alika [10]

Blood borne pathogens can be transmitted between persons through bodily fluid example: needle sticks, human bites, cuts, abrasions

hope this helps!

8 0

4 years ago

A bat with a mass of 0.35 kg travels at a rate of 15 m/s. What is the animal's momentum?

Tanya [424]

Answer:

momentum= mass x velocity = 0.35x15= 5.25kgm/s

6 0

3 years ago