15.0 N object is pulled up an inclined plane at constant velocity. If the inclined plane makes an
1 answer:
Answer:
3.69 N
Explanation:
Draw a free body diagram. There are four forces acting on the object:
Weight force W pulling straight down.
Normal force N pushing perpendicular to the inclined plane.
Friction force f pushing down the inclined plane.
Applied force P pushing up the inclined plane.
Sum of forces in the perpendicular direction:
∑F = ma
N − W cos θ = 0
N = W cos θ
Friction force is normal force times the coefficient of friction:
f = Nμ
f = Wμ cos θ
Plug in values:
f = (15.0 N) (0.300) cos 35.0°
f = 3.69 N
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Answer:
The speed of player is given by
Explanation:
The time of flight for a projectile motion is given by
(i)
where t is the time of flight, v is the initial speed, and α is the angle.
Now the person must also reach the impact point of ball in the same time as above.
Now the total distance D the player needs to cover is basically R horizontal range of projectile minus the distance d, range R is given by,
Now the distance the player must cover is given by
D= R-d
D= - d
(ii)
Now the average speed of player is given by
(iii)
Replacing the values of D and T from eq. (i) and (ii) in eq. (iii).