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3 years ago

Will get brainliest!Worth 99 points! :)

Physics

1 answer:

lions [1.4K]3 years ago

3 0

The Socrates' natural philosophy was just the most important founding figures in the western philosophy.

Darwins penguins rule; Darwin only established the Golden Rule.

Einstien's physics: Einstiens theory of relativity is the most important scientific idea of the modern era.

Newtons principle: Physics Science Newtons Laws of Motion. (This is the ANSWER)

Hope this really helps!!! (:

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A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.7 m/s2. (a) if the tension in the cord is 63

zubka84 [21]

(a)
The formula is:
∑ F = Weight + T = mass * acceleration

as the elevator and lamp are moving downward, I choose downward forces to be positive.
Weight is pulling down = +(9.8 * mass)
Tension is pulling up, so T = -63
Acceleration is upward = -1.7 m/s^2

(9.8 * mass) + -63 = mass * -1.7
Add +63 to both sides
Add (mass * 1.7) to both sides

(9.8 * mass) + (mass * 1.7) = 63
11.5 * mass = 63

mass = 63 / 11.5

Mass = 5.48 kg

(b)
Since the elevator and lamp are going upward, I choose upward forces to be positive.
Weight is pulling down = -(9.8 * 5.48) = -53.70
Acceleration is upward, so acceleration = +1.7

-53.70 + T = 5.48 * 1.7

T = 53.70 + 9.316 = approx 63 N

The Tension is still the same - 63 N since the same mass, 5.48 kg, is being accelerated upward at the same rate of 1.7 m/s^2

3 0

3 years ago

A group of workers applied 10.0 networks of force to move a crate 20.0 meter. Calculate the work

olga2289 [7]

The work done is 200 J

Explanation:

The work done by a force applied to move an object is given by:

$W= F d cos \theta$

where

F is the magnitude of the force

d is the displacement of the object

$\theta$ is the angle between the direction of the force and of the displacement

In this problem, assuming that the force applied by the workers is parallel to the direction of motion of the crate, we have:

F = 10.0 N

d = 20.0 m

$\theta=0^{\circ}$

Therefore, the work done is:

$W=(10.0)(20.0)(cos 0)=200 J$

Learn more about work here:

brainly.com/question/6763771

brainly.com/question/6443626

#LearnwithBrainly

4 0

4 years ago

A particle of mass m= 2.5 kg has velocity of v = 2 i m/s, when it is at the origin (0,0). Determine the z- component of the angu

melomori [17]

Answer:

please read the answer below

Explanation:

The angular momentum is given by

$|\vec{L}|=|\vec{r}\ X \ \vec{p}|=m(rvsin\theta)$

By taking into account the angles between the vectors r and v in each case we obtain:

v=(2,0)

r=(0,1)

angle = 90°

$L=(2.5kg)(1)(2\frac{m}{s})sin90\°=5.0kg\frac{m}{s}$

r=(0,-1)

angle = 90°

$L=(2.5kg)(1)(2\frac{m}{s})sin90\°=5.0kg\frac{m}{s}$

r=(1,0)

angle = 0°

r and v are parallel

L = 0kgm/s

r=(-1,0)

angle = 180°

r and v are parallel

L = 0kgm/s

r=(1,1)

angle = 45°

$L = (2.5kg)(2\frac{m}{s})(\sqrt{2})sin45\°=5kg\frac{m}{s}$

r=(-1,1)

angle = 45°

the same as e):

L = 5kgm/s

r=(-1,-1)

angle = 135°

$L=(2.5kg)(2\frac{m}{s})(\sqrt{2})sin135\°=5kg\frac{m}{s}$

r=(1,-1)

angle = 135°

the same as g):

L = 5kgm/s

hope this helps!!

4 0

3 years ago

Night and day have approximately equal length at what time or times of the year?

Thepotemich [5.8K]

There are two every year – in September and March – when the Sun shines directly on the Equator and the length of day and night is nearly equal.

4 0

3 years ago

5. How much time does it take for a bird flying at a speed of 45 kilometers per hour to travel a

Lyrx [107]

Answer:

$40h$

Explanation:

Use the velocity formula to solve

$v = \frac{d}{t}$

In this question, you are given velocity $v = 45km/h$ , and you are given a distance, $d = 1800km$ . Time in this question is what you'll need to find.