1. A 52 kg water-skier is being pulled by a speedboat. The force causes her to accelerate at 2 m/s/s. Calculate the net force that cause this acceleration.
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2. What is the mass of an elevator, which has a 2000 N force applied to it to accelerate it at 2 m/s/s?
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3. If a 70 kg swimmer pushes off a wall with a force of 250 N, at what rate will the swimmer accelerate from the wall?
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4. What is the kinetic energy of a car with a mass of 500 kg moving at 30 m/s?
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5. What is the potential energy of a 15 kg rock sitting on a cliff 20 m height?
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6. The temperature outside is 27 ºC. What is the speed of sound in air at this temperature?
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7. Water has a specific heat capacity of 4.18 J/gºC. How much heat is needed to raise the temperature of 80 kg from 30 ºC to 55 ºC?
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8. What is the specific heat of an unknown substance if a 4 g sample releases 45 J as its temperature changes from 15 ºC to 22 ºC?
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Verified answer
following:
1.Given :52kg(mass)
2m/s²(acceleration)
formula : F=m.a
Solution: F=52kg•2m/s²
Answer: F= 104kgm/s² or 104N
2.Given: 2000N (Force)
2m/s²(acceleration)
formula: m=F/a
solution: m=2000N/2m/s²
m=2000kgm/s² / 2m/s²
answer: m=1000kg
3.Given : 70kg(mass)
250N(Force)
Formula:a=F/m
Solution:a=250kgm/s² / 70kg
Answer : 3.5 m/s²
Sorry I forgot the others