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saul85 [17]
1 year ago
10

a placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal. half the crowd hopes the ball will clear

the crossbar, which is 3.05 m high. when kicked, the ball leaves the ground with a speed of 20.4 m/s at an angle of 48.0° to the horizontal.
Physics
1 answer:
Alekssandra [29.7K]1 year ago
3 0

The ball will clear the crossbar since the maximum height it attained is greater than 3.05 m.

<h3>Time of motion of the ball</h3>

The time of motion of the ball is calculated as follows;

x = (v cosθ) t

36 = (20.4 cos48) t

36 = 13.65t

t = 2.64 seconds

<h3>Maximum height reached by the ball</h3>

h = (v sinθ)t - ¹/₂gt²

h = (20.4 sin48)(2.64) -  (0.5)(9.8)(2.64²)

h = 5.87 m

Thus, the ball will clear the crossbar since the maximum height it attained is greater than 3.05 m.

Learn more about maximum height here: brainly.com/question/12446886

#SPJ1

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Along a horizontal snow-covered track, a sled, of mass m = 105 kg, slides by the action of a horizontal force of 230 N. The coef
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Answer:

Explanation:

The only thing I can figure you need here is the accleration of the sled. The equation we need to find this is Newton's Second Law that says that sum of the forces acting on an object is equal to the object's mass times its acceleration. For us, that looks like this because of the friction working against the sled:

F - f = ma but of course it's much more involved than that simple equation! We have the F value as 230 N, and we have the mass as 105, but we do not have the frictional force, f, and we need it to solve for a in the above equation. We know that

f = μF_n where μ is the coefficient of friction, and F_n is the normal force, aka weight of the object. We will use the coefficient of friction and find the weight in order to fill in for f:

F_n=mg so

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F_n= 1.0 × 10³ with the correct number of sig dig there. Now to find f:

f = (.025)(1.0 × 10³) so

f = 25 to the correct number of sig fig. Now on to our "real" equation:

F - f = ma and

230 - 25 = 105a. We have to do the subtraction first, round, and then divide since the rules for addition and subtraction are different from the rules for dividing and multiplying.

230 - 25 will round to the tens place giving us 210. Then

210 = 105a. 210 has 2 sig figs in it while 105 has 3, so we will divide and round to 2 sig fig:

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At the circus, the Human Cannonball is
svlad2 [7]

The correct answer is  1.4285714.

In physics, velocity is characterised as a vector measurement of the motion's direction and speed. To be more precise, the rate of change in an object's position relative to a frame of reference and time is another way to describe velocity. The definition of velocity simply states the rate of motion of an object in a specific direction. It determines how quickly or slowly something is going.

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