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3 years ago

Pls answer ASAP will mark brainiest pls

Physics

1 answer:

lapo4ka [179]3 years ago

5 0

Answer:

u need to fix u grammar burh

Explanation:

what u be talkin the the abouts

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A 50 kg child runs off a dock at 2.0 ms (horizontally) and lands in a waiting rowboat of mass 150 kg. At what speed does the row

Alex73 [517]

Answer:

The boat moves away from the dock at 0.5 m/s.

Explanation:

Hi there!

Since no external forces are acting on the system boy-boat at the moment at which the boy lands on the boat, the momentum of the system is conserved (i.e. it remains constant).

The momentum of the system is calculated as the sum of the momentum of the boy plus the momentum of the boat. Before the boy lands on the boat, the momentum of the system is given by the momentum of the boy.

momentum of the system before the boy lands on the boat:

momentum of the boy + momentum of the boat

m1 · v1 + m2 · v2 = momentum of the system

Where:

m1 and v1: mass and velocity of the boy.

m2 and v2: mass and velocity of the boat.

Then:

50 kg · 2.0 m/s + 150 kg · 0 m/s = momentum of the system

momentum of the system = 100 kg m/s

After the boy lands on the boat, the momentum of the system will be equal to the momentum of the boat moving with the boy on it:

momentum of the system = (m1 + m2) · v (where v is the velocity of the boat).

100 kg m/s = (50 kg + 150 kg) · v

100 kg m/s / 200 kg = v

v = 0.5 m/s

The boat moves away from the dock at 0.5 m/s.

5 0

4 years ago

I need help with question 4 please

Yuki888 [10]

Answer:

V = 10 km / 1 hr = 10 km/hr

V = -10 j km / hr if one were to use i, j, k as unit vectors with the usual orientation

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3 years ago

All of the following affect the climate of an area except

Ksivusya [100]

C. A cold front that came through does not affect the climate of an area.

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4 years ago

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In what order do the three types of seismic waves arrive at a seismograph

Mama L [17]

Answer: Seismic waves arrive at a seismograph in the order of fastest to slowest:primary waves, secondary waves, surface waves.

Explanation:

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3 years ago

A baseball player hits a baseball at an angle of 30 degrees above the horizontal. The baseball’s initial speed is 35 m/s.

Paul [167]

The ball's velocity at 2 sec is 30.4 m/s at $-4.0^{\circ}$ (below the horizontal)

Explanation:

The motion of the ball is a projectile motion, therefore it consists of two independent motions:

- A uniform motion (constant velocity) along the horizontal direction

- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction

This means that:

- The horizontal velocity of the ball is constant, and it is given by

$v_x = u cos \theta$

where

u = 35 m/s is the initial speed of the ball

$\theta=30^{\circ}$ is the angle of projection

Substituting,

$v_x = (35)(cos 30)=30.3 m/s$

- The vertical velocity is changing, and its value is given by

$v_y = u_y + at$

where

$u_y = u sin \theta = (35)(sin 30)=17.5 m/s$ is the initial vertical velocity

$a=g=-9.8 m/s^2$ is the acceleration of gravity (negative because it points down)

t is the time

At t = 2 s,

$v_y = 17.5 + (-9.8)(2)=-2.1 m/s$

where the negative sign means that at t = 2 s, the vertical velocity points down.

Now we can find the magnitude of the ball's velocity at 2 sec:

$v=\sqrt{v_x^2+v_y^2}=\sqrt{30.3^2+(-2.1)^2}=30.4 m/s$

While the direction is given by

$\theta=tan^{-1}(\frac{v_y}{v_x})=tan^{-1}(\frac{-2.1}{30.3})=-4.0^{\circ}$

Learn more about projectile motion:

brainly.com/question/8751410

#LearnwithBrainly

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4 years ago