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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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OlgaM077 [116]

Answer:

323.9

Explanation:

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A 5 newton force and a 7 newton force act concurrently on a point. As the angle between the forces is increased from 0 to 180 th

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Answer:

The magnitude of the resultant decreases from A+B to A-B

Explanation:

The magnitude of the resultant of two vectors is given by

$R=\sqrt{A^2 +B^2 +2AB cos \theta}$

where

A is the magnitude of the first vector

B is the magnitude of the second vector

$\theta$ is the angle between the directions of the two vectors

In the formula, A and B are constant, so the behaviour depends only on the function $cos \theta$ . The value of $cos \theta$ are:

- 1 (maximum) when the angle is 0, so the magnitude of the resultant in this case is

$R=\sqrt{A^2 +B^2+2AB}=\sqrt{(A+B)^2}=A+B$

- then it decreases, until it becomes 0 when the angle is 90 degrees, where the magnitude of the resultant is

$R=\sqrt{A^2 +B^2+0}=\sqrt{A^2+B^2}$

- then it becomes negative, and continues to decrease, until it reaches a value of -1 when the angle is 180 degrees, and the magnitude of the resultant is

$R=\sqrt{A^2 +B^2-2AB}=\sqrt{(A-B)^2}=A-B$

4 0

3 years ago

Your shopping cart has a mass of 65 kilograms, In order to accelerate the shopping cart down an aisle at 0.3 m/sec2, what force

garri49 [273]

Remember Newton's second law: F=ma

to get the force in newtons, mass should be in kg and acceleration in m/s^2

conveniently, we don't need to convert units

we just need to multiply the two to get the force

65* 0.3 = 19.5 kg m/s^2 or N

if significant digit is an issue, the least number if sig figs is 1 so the answer would be 20 N

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3 years ago

A gold bar has a density of 19.3 g/mL. If the gold bar has a mass of 6.3 grams, what is the volume?

Natali [406]

Answer:

The correct answer is "0.32 mL".

Explanation:

The given values are:

Density of gold bar,

d = 19.3 g/mL

Mass of gold bar,

m = 6.3 grams

Now,

The volume will be:

⇒ $Density = \frac{Mass}{Volume}$

or,

⇒ $Volume=\frac{Mass}{Density}$

On substituting the values, we get

⇒ $=\frac{6.3 \ g}{19.3 \ g/mL}$

⇒ $=0.32 \ mL$

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