Physics

Answers on following post



 A spring has a spring constant of 120 newtons per meter. How much potential energy is stored in the spring as it is stretched .20 meter? 

A. 1.2 J
B. 2.4 J
C. 3.1 J
D. 7.4 J

 A distance of 1.0 x 103 separates the charge at the bottom of the cloud and the ground. The electric field intensity between the bottom of the cloud and the ground is 2..0 x 104 newtons per coulomb. What is the potential difference between the bottom of the cloud and the ground? 

A. 1.4 x 104 V
B. 2.5 x 103 V
C. 2.8 x 106 V
D. 2.0 x 107 V

 When Adam drinks cold water, his body warms the water until thermal equilibrium is reached. If he drinks six glasses (2.5 kilograms) of water at 0 degrees Celsius in a day, approximately how much energy must his body expend to raise the temperature of this water to his body's temperature of 37 degrees Celsius? 

A. 210 kJ
B. 305 kJ
C. 390 kJ
D. 414 kJ