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3 years ago

Which of these is not an example of

Physics

1 answer:

prohojiy [21]3 years ago

5 0

Answer:

A) The process that give us day and night.

Explanation:

From the answer choices provided the one that is not an example of this is the process that give us day and night. This is because, the day/night cycle occurs as the Earth spins on it's axis. This cause one side of the Earth to be facing the Sun, which is the side that is currently experiencing day time while the other side is experiencing night time. As the Earth spins the cycles repeat. This is not an example of revolving.

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Serving at a speed of 170 km/h, a tennis player hits the ball at a height of 2.5 m and an angle θ below the horizontal. the base

Sholpan [36]

serving speed = 170 km/h

now we will convert it into m/s

$v = 47.22 m/s$

now it will have two components along x and y directions

$v_x^2 + v_y^2 = 47.22^2$

also in x and y directions we know

$2.5 - 0.91 = v_y*t + \frac{1}{2}gt^2$

$11.9 = v_x *t$

$1.59 = v_y*t + 4.9*t^2$

$1.59 = 11.9 tan\theta + 4.9*(\frac{11.9}{47.22})^2(1 + tan^2\theta)$

$1.59 = 11.9 tan\theta + 0.311 (1 + tan^2\theta)$

by solving above equation we have

$tan\theta = 0.107$

$\theta = 6.11 degree$

so angle is 6.11 degree below the horizontal

now we have

$v_y = 47.22 sin6.11 = 5.02 m/s$

$v_x = 47.22 cos6.11 = 46.95 m/s$

now time taken by ball to reach the ground will be

$2.5 = 5.02 * t + \frac{1}{2}gt^2$

$t = 0.37 s$

now the displacement in x direction will be

$x = v_x * t$

$x = 46.95 * 0.37 = 17.37 m$

now the distance from net will be

$d = 17.37 - 11.9 = 5.47 m$

So it will land inside the line

3 0

3 years ago

Calculate the amount of gravitational potential energy at the top of each hill

Marizza181 [45]

The gravitational potential energy has the formula:
PE = mgh
where PE is in joules
m is the mass of the object in kg
g is the acceleration due to gravity
h is the height in m

since you did not give the value of h, i cannot fully answer your quesstion.
PE = (58/1000 kg) (9.81m/s2) h
PE = 0.57h
just substitute the value of h in the equation

5 0

4 years ago

Through which of these media do sound waves

defon

Wood i think could be wrong

3 0

3 years ago

Determine the thrust produced if 1.5 x 10^3 kg of gas exits the combustion chamber each second, with a speed of 4.00 x 10^3 m/s.

ozzi

Answer:

The thrust is $6\times 10^6\ N$