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4 years ago

HHEELLPPP ITS ARGENT!!! Just Answer B and C PLEASEEEE

Physics

1 answer:

zavuch27 [327]4 years ago

8 0

Answer:

B. F = 7.35 N

C. Equal and opposite

Explanation:

Given

The mass of the football, m = 0.42 Kg

Time of flight of the ball, t = 1.6 s

The initial velocity of the ball, u = 0

The final velocity of ball, v = 28 m/s

The acceleration of the ball is given by the formula

a = (v - u) /t m/s²

Substituting the values in the above equation

a = (28 - 0) / 1.6

= 17.5 m/s²

The force on the ball is given by the formula

F = m x a newton

Substituting the values in the above equation for force

F = 0.42 Kg x 17.5 m/s²

= 7.35 N

Therefore the force acting on the ball is, F = 7.35 N

According to newton's third law of motion, if a person exerts a force on a ball, the ball also exerts a force that is equal to applied force on the person's foot. It is in a direction opposite to the force exerted by the kicker's foot.

Hence, the forces are equal and acting in opposite direction.

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The distance between two planets is 1600 km. How much time would the light

Snowcat [4.5K]

Answer:

5.33*10^-3 seconds

Explanation:

c = d/t

c = speed of light constant (3.0*10^5 km/s)

d = distance (1600 km)

t = ?

3.0*10^5 = 1600/t

t = 1600/3.0*10^5

t = 5.33*10^-3 seconds

I hope this helped! :)

6 0

3 years ago

A plane has an airspeed of 142 m/s. A 30.0 m/s wind is blowing southward at the same time as the plane is flying. What must be t

const2013 [10]

Answer:

$\theta=12.19^{\circ}$

Explanation:

Given that

The speed of the airplane ,v= 142 m/s

The speed of the air ,u = 30 m/s

Lets take angle make by airplane from east direction towards north direction is θ .

Now by using diagram ,we can say that

$sin\theta =\dfrac{u}{v}$

Now by putting the values in the above equation we get

$sin\theta =\dfrac{30}{142}$

$sin\theta=0.21$

$\theta=12.19^{\circ}$

Therefore the angle will be 12.19° .

4 0

4 years ago

Technician A says that the intake and exhaust manifolds have to be removed before removing the engine from the vehicle. Technici

Amiraneli [1.4K]

Answer: Technician A is correct

Explanation:

The intake manifold is the compactment that all fuel and air supply to the cylinders. It's connected to the engine so it has to be disconnected while the exhaust manifold receives all the exhaust gases from the cylinders and releases the gas through a single or double exhaust gases outlet.

5 0

3 years ago

Zero, a hypothetical planet, has a mass of 5.3 x 1023 kg, a radius of 3.3 x 106 m, and no atmosphere. A 10 kg space probe is to

Andrej [43]

(a) $3.1\cdot 10^7 J$

The total mechanical energy of the space probe must be constant, so we can write:

$E_i = E_f\\K_i + U_i = K_f + U_f$ (1)

where

$K_i$ is the kinetic energy at the surface, when the probe is launched

$U_i$ is the gravitational potential energy at the surface

$K_f$ is the final kinetic energy of the probe

$U_i$ is the final gravitational potential energy

Here we have

$K_i = 5.0 \cdot 10^7 J$

at the surface, $R=3.3\cdot 10^6 m$ (radius of the planet), $M=5.3\cdot 10^{23}kg$ (mass of the planet) and m=10 kg (mass of the probe), so the initial gravitational potential energy is