Can someone help me please

Answer:

The correct option is;

b. How high the barbell is being lifted

Explanation:

The work done in lifting the 160 N barbell is equal to the potential energy gained by the barbell in the final elevated position of the barbell

Therefore, in order to find the work done to lift the barbell, we can calculate the potential energy gained by the barbell when it is placed at height

The work done to lift the barbell = The potential energy, P.E., gained by the barbell

The potential energy of an object, P. E. = The mass of the object, m × The acceleration due to gravity, g × The height to which the barbell is lifted, h

∴ Mathematically, P.E. = m × g × h

Weight, W = Mass, m × The acceleration due to gravity, g

The weight, W of the barbell is given as W = 160 N

∴ W = m × g = 60 N

From which we have;

P.E. = m × g × h = W × h

∴ The work done to lift the barbell = P.E. = 60 N × h = 60 N × The height to which the barbell is lifted.

Therefore the information which need be known is the height to which the barbell.

The average speed of the car is 35 km/hr.

To calculate the average speed, the given values of speed are:

x = 20 km / hr

y = 50 km / hr

  If two objects are in motion, the distance by those two objects at any  particular interval of time is said to be average speed.

The unit of average speed is m/s or km/hr.

For this particular question, the formula to find the average speed from the given speed is,

                     Average speed =  ( x + y ) / 2

                                                =  ( 20 + 50 ) / 2

                                                = 70 /2

                                                = 35 km / hr.

Thus, Average speed can be calculated as 35 km/hr.

So, the Option C is the correct answer.

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Answer:

What is the quantity that has the units of m/s²?

Acceleration is the quantity that has the units of m/s².

Explanation:

Acceleration is the rate of change of velocity.

Acceleration=(Final velocity-Initial velocity)/Time.

Answer:

Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe. The table shows the lifetimes of stars as a function of their masses.[1] All stars are formed from collapsing clouds of gas and dust, often called nebulae or molecular clouds. Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-seque

Answer:

An ion is an atom or group of atoms with a positive or negative charge. Ions form when atoms lose or gain electrons to obtain a full outer shell: metal atoms lose electrons to form positively charged ions non-metal atoms gain electrons to form negatively charged ions.

Explanation:

Answer:

Nuclear energy is usually considered another non-renewable energy source.

Answer:

False, if its not moving there is no potential energy.

Answer:

The ball is at its max Potential energy because if it falls and hits the ground it will be at its max kinetic energy so since sitting high up it is equal to max potential energy. PE=784 J Trust ME that guy is wrong.

Explanation:

Answer:

3 miles per hour

Explanation:

Displacement is the overall change in distance or position of an object. It is the shortest distance from the starting point to the ending point. Displacement is a vector quantity.

Velocity is the time rate of change in displacement, it is the ratio of the total displacement to the total time taken. It is given by the formula:

Velocity = displacement / time

The ship sails north for 2 hours, traveling a total of 15 miles. Then the ship turns south and travels 6 miles in an hour.

The total displacement = shortest distance from initial to final point = 15 miles - 6 miles = 9 miles

Total time = (2 hours) + (1 hour) = 3 hours

Velocity = displacement / time = 9 miles / 3 hours = 3 miles per hour

Answer: 3mph

Explanation:

Answer:

No. When the distance is doubled, the gravitational force is 1/4 times as strong, therefore, the correct answer is she is not correct

Explanation:

The gravitational force is given as follows;

[tex]F} =G \times \dfrac{m_{1} \times m_{2}}{r^{2}}[/tex]

Where;

m₁, and m₂ are the masses sharing the gravitational field

G = The universal gravitational constant

r = The distance between the centers of the two masses

Therefore, when the new distance, R = 2 × r, we get;

[tex]F} =G \times \dfrac{m_{1} \times m_{2}}{R^{2}} = G \times \dfrac{m_{1} \times m_{2}}{(2 \times r)^{2}} = G \times \dfrac{m_{1} \times m_{2}}{4 \times r^{2}} = \dfrac{1}{4} \times G \times \dfrac{m_{1} \times m_{2}}{r^{2}}[/tex]

Therefore, when the distance is doubled, the gravitational force is one fourth as strong, therefore, she is not correct.

I would think the answer would be c

Answer:

25000

Explanation:

100 x 25 x 10 = 25000

The total initial energy of the biker  and the bike  is 25000 J.

Energy is the ability to do tasks. Joule is the SI unit for energy (J).

Potential energy, kinetic energy, thermal energy, chemical energy, electrical energy, and light energy are some of the several types.

Given parameters:

The bike and person have a total mass of 100 kg.

Speed of them = 10 m/s.

Height of them = 25 m.

Hence, initial  kinetic energy = 1/2mv² = 1/2×100×10 joule = 500 joule.

initial potential energy = mgh = 100 ×9.8×25  joule = 24500 joule.

Hence, total  initial energy = 24500 joule + 500 joule = 25000 joule.

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Answer:

D = 4.05 km

Explanation:

In this case, it's really neccesary to analyze the given data.

First, the rider goes 10 km SE 15°. Then 11 km 30° to the NE direction. Then, he dispatch the order, and then, takes a shorcut to get back at 22 km heading W (This is the missing data of your exercise).

According to all these data, we have the magnitude of the displacement in each part of the travel, but to know the displacement we need to know the x and y components of these magnitudes, so we can really know the total displacement of the rider.

Let's cut this by parts. Part A would be the 10 km SE, Part B 11 km 30° NE and finally Part C would be the remaining 22 km

Part A:

in this case, is heading south east, so it's going in the x-axis positive but y-axis negative so:

Dxa = 10 cos15° = 9.659 km

Dya = 10 sin15° = 2.588 km (But as we are heading south is negative) = -2.588 km

Part B:

Heading NE, it's positive in the x-axis and y-axis so:

Dxb = 11 cos30° = 9.526 km

Dyb = 11 sin30° = 5.5 km

Part C:

Finally in this part is heading west, which means is heading in the x-axis negative, and it does not have a y component so:

Dxc = Dc = -22 km

Now that we have the displacement for each part and it's components, let's calculate the displacement in X and Y:

Dx = 9.659 + 9.526 - 22 = -2.815 km

Dy = -2.588 + 5.5 = 2.912 km

To calculate the magnitude of the displacement:

D = √Dx² + Dy²

D = √(-2.815)² + (2.912)²

Hope this helps

Explanation:

We need to calculate the time it had travelled first:

9:00 to 12:00 = 3 hours.

12:00 to 2:00 = 2 hours

Total travel time = 5 hours.

The formula for speed is distance ÷ time (Hence, the unit for speed is m/s, kph, mph, etc.)

= 629km ÷ 5 hours

= 125.8 km/hour ~ 125.8kph

Answer:

1360.3ft

Explanation:

Given parameters:

Time taken for the fish to land  = 9.2s

Unknown:

Height of the cliff  = ?

Solution:

To solve this problem, we use one of the kinematics equation:

  S = Ut  + [tex]\frac{1}{2}[/tex] g t²  

 S is the height

 U  is the initial velocity  = 0m/s

 g is the acceleration due to gravity  = 9.8m/s²

t is the time taken  

So;

 S  = (0 x 9.2)  + ([tex]\frac{1}{2}[/tex] x 9.8 x 9.2²)   = 414.7m

            1m  = 3.28ft

       414.7m  = 414.7 x 3.28 = 1360.3ft

Answer:

get some

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pour the ⛽ on the module,

get that on itttttt and booooooommmm

Explanation:

Answer:

The mechanical advantage of the wheelbarrow is the product of the mechanical advantage of the lever, and the mechanical advantage of the wheel and axle. Therefore, the wheelbarrow has a mechanical advantage of 4.

hope this helps :D

The order should be: 20 glass mugs, 10 porcelain tea cups, 2 glass cups, and then 5 plastic cups.

Explanation:

You take the original mass of one single object, and then multiply it by the total number of that specific object. Hope this helps!

Answer:

The force is applied for a longer time in the long cannon.

Answer:

5.56 x 10⁻⁴ degree

Explanation:

1 degree = 60 arc minutes

1 minute = 60 arc second

1 degree = 60 x 60 = 3600 arc second .

3600 arc second = 1 degree

1 arc second = 1 / 3600 degree = 2.78 x 10⁻⁴  degree

2 arc second = 5.56 x 10⁻⁴ degree .

Answer:

50° and 60°

Explanation:

hope this help

Answer:

[tex]v_i=4.12\ m/s[/tex]

Explanation:

Given that,

Final velocity, [tex]v_f=0\ m/s[/tex]

Acceleration, [tex]a=-9.8\ m/s^2[/tex]

Displacement, [tex]\Delta x = 0.87\ m[/tex]

We need to find the initial velocity of the large hopper.

Using the third equation of motion as follows :

[tex]v_f^2=v_i^2+2a\Delta x\\\\0=v_i^2+2\times (-9.8)\times 0.87\\\\v_i^2-17.052=0\\\\v_i=4.12\ m/s[/tex]

So, the initial velocity of the large hopper is 4.12 m/s.

Answer:

33 miles

Explanation:

10 + 15 + 8 = 33

Answer:

the distance is 0.6 km

Explanation:

The computation of the distance is shown below:

As we know that

Distance = Speed × time

where

Speed = 72 km/h

And, the time is 30 seconds

So, the distance is

= 72 × 30

= 0.6 km

Hence, the distance is 0.6 km

Answer: 3,000 N

Explanation:

F = mass x acceleration

F = (1500 kg)(2 m/s²)

F = 3000 N

Answer:

Yes. If a car travels in a circular path with constant speed, its motion is called uniform circular motion

Explanation:

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Answer:

:)

Explanation:

Answer:

If the wave slows down with no change in frequency, the wavelength decreases.

If the wave slows down with no change in frequency, then the wavelength decreases.

A wave is defined as the disturbance that has the ability to transfer energy from one point to another in a medium.

The properties of a wave are given as;

Wavelength can be defined as the distance that is observed between adjacent points in an identical cycle of a waveform.

Frequency is the number of cycles of a wave that can occur per minute time.

Time period can be defined as the time it takes for a complete cycle of wave to occur.

Wave speed can be defined as the distance a wave travels in a given amount of time.

Amplitude can be defined as the distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough.

When there is a change in the speed of the wave then the length of the wave would decrease.

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Answer:

what about it?

Explanation:

Answer:

its my lab report i did it in 5 minutes and it might be wrong sorry lol

Explanation:

heheheh stinky badussey