First, we need to fight the weight of the balls instead of their mass. We do this by multiplying their weight it kg by 9.8. This gives us .98 N. To find the potential energy of the rolling ball, we find its kinetic energy. The formula for this is KE=mass*velocity^2*1/2.
Plugging in our numbers, we have Kinetic energy = .1 * 1^2*1/2 which gives us .05 joules.
Now we find the potential energy of the ball on the shelf. For this we do:
Potential energy = .1*9.8*1, and our answer is .98 joules. Clearly, the ball on the shelf has more energy.
D
The student's conclusion shows experimental bias
Just because most of nis classmates like puffed cereal ,it is inappropriate to conclude puffed cereal is better than oats cereal
Answer: 3.53 x 10^-4 s
Explanation:
12.7cm x 1m/100cm = 0.127m
V = d/t
t x V = d
t = d/v = 0.127m/(360m/s) = 0.000353s or 3.53 x 10^-4
Answer:
C) The spring constant of each half will be twice the spring constant of the original long spring since it will stretch only half as much under the same tension.
Explanation:
Hooke's law states that the force needed to extend or compress a spring by a distance is proportional to that distance. If is given as:
F = ke, where F is the force applied, k is spring constant and e is the extension.
If a force f is applied to a spring with a spring constant k and by a distance stretched (x) then:
k = F / x
For half the spring, if the same force F is applied, the stretch would be half (x/2), hence the spring constant C is:
C = F / (x/2)
C = 2 (F / x) = 2 * spring constant of original spring