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3 years ago

Can y’all please help me with the two part question?

Physics

1 answer:

Valentin [98]3 years ago

6 0

Exactly the same situation as the baseball rolling off the desk, only with different numbers.

Distance falling from rest = (1/2) · (g) · (T²)

Janet fell from rest and landed in the water 2.1 sec later.

How high did she fall from ?

Distance = (1/2) · (9.8 m/s²) · (2.1 sec)²

Distance = (4.9 m/s²) · (4.41 s²)

Distance = 21.61 meters (HIGH platform. About 71 feet ! ! )

She didn't just roll off the edge of the platform.

She shot out from it horizontally, at 2.46 m/s.

She kept moving horizontally at 2.46 m/s all the way down.

How far was she from the tower when she went SPLAT at the bottom ?

Distance = (speed) · (time)

Distance = (2.46 m/s) · (2.1 sec)

Distance = 5.17 meters

(That's 17 feet from the tower ! I sure hope they put the pool that far out.)

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5 0

2 years ago

The container is filled to yh 350 ml mark water is observation or inference?

Lorico [155]

This is an observation.

4 0

4 years ago

The bearing of a lighthouse from a ship was found to be N 37 degrees E. After the ship sailed 2.5 miles due south, the new beari

ella [17]

Answer:

The distance between the lighthouse and the ship

from the start position A = 5.08 miles

from the Final point B = 7.23 miles

Explanation:

Note: Refer the figure

Let the position of the lighthouse be 'L'

Given:

When the ship is at the position A, ∠DAL=37°

Now, when the ship sails through a distance of 2.5 i.e at position B

mathematically,

AB=2.5 miles

∠ABL=25°

Now,

∠DAL + ∠LAB = 180°

37° + ∠LAB = 180°

∠LAB = 180° - 37° = 143°

Also, In ΔLAB

∠LAB + ∠ABL + ∠ALB = 180°

143° + 25° + ∠ALB = 180°

∠ALB = 180° - 143° - 25° = 12°

Now using the concept of the sin law

In ΔLAB

$\frac{AL}{sin25^o}=\frac{2.5}{sin12^o}$

AL = 5.08 miles

and,

$\frac{BL}{sin143^o}=\frac{2.5}{sin12^o}$

BL = 7.23 miles

hence,

The distance between the lighthouse and the ship

from the start position A = 5.08 miles

from the Final point B = 7.23 miles

5 0

3 years ago

You step on the gas pedal in your car, and the car engine’s rotational speed changes from 1200 rpm to 3000 rpm in 3.0 s. What is

Gnom [1K]

frequency of engine is given here

$initial frequency = 1200 rpm$

$f_i = 1200/60 = 20 Hz$

$final frequency = 3000 rpm$

$f_f = 3000/60 = 50 Hz$

now we have angular speed as

$\omega_i = 2\pi f_i$

$\omega_i = 2\pi(20) = 40\pi$

similarly

$\omega_f = 2\pi f_f$

$\omega_f = 2\pi(50) = 100 \pi$

now by the formula of angular acceleration we will have

$\alpha = \frac{\omega_f - \omega_i}{\Delta t}$

$\alpha = \frac{100\pi - 40\pi}{3}$

$\alpha = 20\pi rad/s^2$

$\alpha = 62.8 rad/s^2$

4 0

3 years ago

How can you use the density of an object to predict whether it will sink or float?

Bas_tet [7]

Answer:

Explanation:

If an object has a higher density than the fluid it is in (fluid can mean liquid or gas), it will sink. If it has a lower density, it will float. Density is determined by an object's mass and volume. If two objects take up the same volume, but have one has more mass, then it also has a higher density.

7 0

3 years ago

Read 2 more answers