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4 years ago

If you throw a tennis ball in the air,what type of motion does it have?

1 answer:

5 0

-- Accelerated motion. Its speed changes constantly. If it's not tossed STRAIGHT up, its direction also changes constantly. Even if it IS tossed straight up, its direction changes when it gets to the top and starts falling.

-- Projectile motion. There is vertical force on the object because of gravity, but no horizontal force.

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If a body of 2kg mass is at a distance of 7200km from the center of the earth .What

wlad13 [49]

None of the choices is correct.

== The Earth's radius is 6,371 km. That's how far you are from the center of the Earth when you're on the ground.

== The acceleration of gravity on the ground is 9.8 m/s² .

== The acceleration of gravity varies inversely as the square of the distance from the center of the Earth. So, at 7,200 km from the center, it's

(9.8 m/s²) · (6371km/7200km)² .

Stuffing this through your cakulator, you'll get <em>7.67 m/s²</em> .

3 0

3 years ago

How simple machines achieve mechanical advantage?

sveta [45]

Simple machines can be assembled quickly and repaired easily.

6 0

3 years ago

The energy of a photon of light is __________ proportional to its frequency and __________ proportional to its wavelength.

icang [17]

Answer:

D) directly, inversely

Explanation:

The energy of a photon of light is directly proportional to its frequency and inversely proportional to its wavelength.

Frequency is the number of waves that passes through a point per unit of time.

Wavelength is the is the distance between successive crests or troughs on a wave.

Mathematically, frequency is related to wavelength and velocity using;

Energy = h x f

where h is the Planck's constant

f is the frequency

Since c = f ∧

where f is the frequency of the wave

∧ is the wavelength of the wave

c is the speed of light

So;

f = c/∧

Therefore;

E = $\frac{h c}{wavelength}$

From the equation, we see an inverse relationship between E and wavelength and a direct one with frequency.

6 0

3 years ago

The game "Whack-a-Mole", in which the player must "whack" randomly appearing moles with a hammer as quickly as possible when the

olga55 [171]

Answer:

reaction time

Explanation:

According to my research on studies conducted by various neurologists, I can say that based on the information provided within the question this game best describes the reaction time task. This is the amount of time it takes for your brain to process the visual information and for your body to react accordingly. This is because the toy moles only pop their heads out for an extremely small amount of time in which you have to hit them with the hammer before they go back down.

I hope this answered your question. If you have any more questions feel free to ask away at Brainly.

4 0

4 years ago

Calculate the force it would take to accelerate a 250 kg motorcycle at a rate of 5m/s^2

bija089 [108]

1250 N of force is required to accelerate a 250 kg motorcycle at a rate of 5 m/ $s^{2}$ .

<u>Explanation:</u>

As per the second law of motion stated by Newton, the net unbalanced external force acting on any object is directly proportional to the product of mass and acceleration experienced by the object.

As here the object is given as motorcycle of mass 250 kg. Also the acceleration exhibited by the motorcycle is stated as 5 m/ $s^{2}$ . So from the Newton's second law of motion,

Net force = Mass of the motorcycle× Acceleration of the motorcycle

Net force = 250 × 5 = 1250 N.

Thus, 1250 N of force is required to accelerate a 250 kg motorcycle at a rate of 5 m/ $s^{2}$ .

5 0

3 years ago