Answer: 800N
Explanation:
Given :
Mass of ball =0.8kg
Contact time = 0.05 sec
Final velocity = initial velocity = 25m/s
Magnitude of the average force exerted on the wall by the ball is can be calculated using the relation;
Force(F) = mass(m) * average acceleration(a)
a= (initial velocity(u) + final velocity(v))/t
m = 0.8kg
u = v = 25m/s
t = contact time of the ball = 0.05s
Therefore,
a = (25 + 25) ÷ 0.05 = 1000m/s^2
Therefore,
Magnitude of average force (F)
F=ma
m = mass of ball = 0.8
a = 1000m/s^2
F = 0.8 * 1000
F = 800N
Answer:
Explanation:
Velocity vs speed and distance vs displacement is a pretty important. Distance and speed have no direction while displacement and velocity have a direction.
In other words, taking the first example, going 5m one way and then 14 the other would make the total distance 19m, while displacement would be -9m from where you started.
Anyway, velocity is displacement divided by time. For the first one I already got that the displacement is -9m, and the time is 11 minutes. It's worth noting that the answers are all in m/s, so we should convert the minutes to seconds. To do that multiply 11 minutes by (60 seconds/1 minute) so the minutes cancel out. so 11*60 is 660 seconds. Now, to find velocity we just divide. -9m/660s = -.0136 Which... doesn't seem to be one of the options...
For the second part it gives two point of views. If you were standing on the carrier, the spy would look like it was moving 4 m/s away from you, but the carrier itself is moving 12 m/s in the positive direction to an onlooker. If it's hard to figure out try thinking what it would look like if the spy was just standing still. it would look like they were moving -12 m/s if you were standing on the carrier. Then if the spy was moving at say 1 m/s it would look like they were moving -11 m/s if you were standing on the carrier.
Just keep that line of reasoning , where if it looks like the spy is moving -4 m/s from the carrier then the spy is moving 4 m/s slower than the carrier, so the spy is moving at 8 m/s
Pretty sure I got the first part right, so maybe a misprint from the question?
Answer:
Weight is a measure of the force of gravity pulling down on an object
mass*force
Even though the mass of the earth stays the same, the force gravity has on us will double because there is less space in the atmosphere for the gravity to pull anything in towards its center. Let me know if I'm correct!
Explanation:
Newton’s third law of motion states that every action has an equal and opposite reaction. This indicates that forces always act in pairs. Reaction forces are equal and opposite, but they are not balanced forces because they act on different objects so they don’t cancel each other out.
