All categories

3 years ago

ILL MARK BRAINLIEST

Physics

1 answer:

Mnenie [13.5K]3 years ago

8 0

Explanation:

2. Power is defined as the rate of doing work. Mathematically, it can be given by :

$P=\dfrac{W}{t}$

Where

W is work done or energy

t is the time taken

3. The formula of potential energy can be given by :

$P=mgh$

Where

m is the mass of the object

g is the acceleration due to gravity

h is height

Hence, this is the required solution.

You might be interested in

Please help me, I'm not good in physics.

expeople1 [14]

Answer:

Upward direction.

The friction is kinetic friction

3 0

3 years ago

A cannonball is catapulted toward a castle. The cannonball’s velocity when it leaves the catapult is 51.6 m/s at an angle of 37.

Andrei [34K]

Answer:

$v_{y}=35.21m/s$

Explanation:

From the exercise we know the cannonball's initial velocity, the angle which its released with respect to the horizontal and its initial height

$v_{o}=51.6m/s\\\beta =37.0º\\y_{o}=7m$

If we want to know whats the y-component of velocity we need to use the following formula:

$v_{y}^2=v_{oy}^2+ag(y-y_{o})$

Knowing that $g=-9.8m/s^2$

$v_{y}=\sqrt{((51.6m/s)sin(37))^2-2(9.8m/s^2)(0m-7m)}=35.21m/s$

So, the cannonball's y-component of velocity is $v_{y}=35.21m/s$

6 0

3 years ago

6. Four people are trying to help push and lift a refrigerator up a series of stairs. Jim pushes

professor190 [17]

Answer:

Net force due to all on the refrigerator is 400 N

Explanation:

As we know that two people are pushing the refrigerator while other two people are lifting the refrigerator

So net push force on the refrigerator is given as

$F = F_1 + F_2$

$F = 60 + 210$

$F_1 = 270 N$

Similarly net lift force on the refrigerator is given as

$F = F_1' + F_2'$

$F = 200 + 95$

$F_2 = 295 N$

Now net force on the refrigerator is given as

$F_{net} =\sqrt{F_1^2 + F_2^2}$

$F_{net} = \sqrt{270^2 + 295^2}$

$F_{net} = 400 N$

4 0

4 years ago

A fireman is standing on top of a building 19 m high, holding a firehose 1 m above the top of the building. She finds that if sh

DENIUS [597]

Answer:

A 2 d vector model

The acceleration function is -9.8 m/s2 which is gravity

Initial velocity on the Y axis is 0, on the X axis is 12 m/s

Inital position is 20 mts above the ground.

It takes the water 1.01 seconds to reach the other building.

THe distace from one building to the other is 12.11 meters.

Explanation:

In order to solve this you just need to carefully read the problem and the data you are given, and use the formula for height in free fall:

$h=\frac{1}{2} g*t^{2}$

So first the data, we know that the water is coming out at a height of 20 meters since the building is 19 meters tall and the fireman is holding the firehose 1 meter above it, and the water is hitting the second building at a height of 15 meters, that means that the water is travelin -5meters.

Gravity as it doesn´t say otherwise would be 9.8m/s2 since that is gravity on earth, and water is leaving the firehose at 12m/s horizontally.

We can calculate the time by using the height formula fro free fall:

$h=\frac{1}{2} g*t^{2}\\5=\frac{1}{2} 9.81*t^{2}\\t^{2}= \frac{10}{9.8} \\t^{2}=1.0193\\t=1.009 seconds$

So it takes 1.009 seconds for the water to frop from 20 to 15 meters, as the horizontal velocity remains the same we just multiply it by the time and we get the horizontal distance between the two buildings and that would be:

12.11 meters.

5 0

4 years ago

The biodiversity of cultivated crops is currently under threat

Angelina_Jolie [31]

C. Establishing a seed bank with a variety of seeds of

different crop species

Explanation:

Establishing a seed bank with a variety of seeds of different crop species is a cooperative behavior that would best enable humans to prevent the problem of loss of biodiversity of cultivated crops.

Modern agricultural practices is profit driven and centered on mono-cropping.
Mono-cropping is an agricultural practice in which only one crop type is cultivated on a mechanized scale.
Mono-cropping leads to less diversity of crop species as just only the cultivation of economically important crops are encouraged.
In order to avert the menace that comes along with mono-cropping, seed banks are viable place to keep and protect other plant species from going into extinction.
Seed banks provides a preservation of different plant species by focusing on storing their viable seeds.

Learn more:

Inhumane farming brainly.com/question/4674681

#learnwithBrainly

4 0

3 years ago

Read 2 more answers