Answer:
0.5mi/min
Explanation:
Velocity = change in distance/time taken
Velocity= (5-0)/(20-10)=5/10=0.5mi/min
B. A stream of particles, or otherwise known as photons, small pieces of light. All of the rest of the options could never make a shadow.
Answer: 2.85 N.s
Explanation: Impulse is the product of force and time or expressed in the following formula:
J = F x t
= 475 N x 0.006 s
= 2.85 N.s
Answer:

Explanation:
From frequency of oscillation

Initially with the suspended string, the above equation is correct for the relation, hence

where k is force constant and m is the mass
When the spring is cut into half, by physics, the force constant will be doubled as they are inversely proportional

Employing f2/ f1, we have

Answer: positive
Explanation: because opposites attract and north=positive and south=negative the answer should be positive.