A rock is thrown straight upward off the edge of a balcony that is 5 m above the ground. The rock rises 10 m, then falls all the way down to the ground below the balcony. What is the rock's displacement?

Answer: Option A

Explanation: The buoyant force depends on the amount of displaced fluid (in this case water)

As the wood is less dense than the iron, the wood requires a lot less upwards force to float, and it only displaces a little bit of fluid, in the other case, the iron requires a lot more of force to do it, so it displaces a lot of water and is totally submerged, and the iron block can never float actually, so it sinks down, at the point that the buoyant force applied is negative (the weight of the water upside the block is bigger than the force upwards)

The Buoyant force can be calculated as:

B = weight on-air - weight on water.

The block of wood is floating, so the weight on the water is zero, and the buoyant force is equal to his weight in the air.

For the block of  iron, we have:

B = Weight on-air - weight on water, here in both cases we have positive numbers, but not enough information to know them.

Then the only information that we have is that the woodblock displaces less water than the other block, so with this, we only can know that the buoyant force in the woodblock is smaller.

Final answer:

When a 10-newton force is applied to a 2-kg block and the block slides across the floor at a constant speed of 5 m/s, we can conclude that the applied force is balanced by the frictional force acting on the block.

Explanation:

From the given information, we can conclude that the applied 10-newton force is balanced by the frictional force acting on the block. This is because the block slides at a constant speed of 5 m/s, indicating that the net force on the block is zero. The frictional force is equal in magnitude and opposite in direction to the applied force. Therefore, we can infer that the magnitude of the frictional force is also 10 newtons. This situation demonstrates Newton's first law of motion, which states that an object will remain at rest or move with constant velocity unless acted upon by an external force.

Answer:

0.4km/s

Explanation:

To be able to know the greatest speed out of all the speed values, we will have to convert the velocities value to m/s.

Converting velocity of 400cm/s to m/s, we have;

400cm/s × 1m/100cm

= 4m/s

Since 100cm = 1m

For velocity of 0.4km/s, we have;

0.4km/s × 1000m/1km

= 400m/s

Note that 1000m = 1km

For velocity 40,000mm/s, we have;

40,000mm/s× 1m/1000mm

= 40m/s

Since 1000mm = 1m

Therefore among all the converted values, the velocity of 0.4km/s which is equivalent to 400m/s is the greatest.

Less heat would be removed from the refrigerator.

Answer:

False

Explanation: Lightening is not an example of matter in solid or liquid state. It is a phenomenon of spark of electricity in the atmosphere. Lightening can also be seen in volcanic eruptions,forest fires, thunderstorms, hurricanes etc. In the initial stage of development of lightening air acts as an insulator between positive and negative charge but when charge develops enough it break the wall of insulator air and sparking occurs.

The energy transformations chart that take place when energy from the wind is used to generate electricity is  best completed by kinetic energy transformed to mechanical energy.

Wind power, also known as wind energy, is the use of wind turbines to generate electricity. Wind energy is a popular, sustainable, renewable energy source that has a much lower environmental impact than burning fossil fuels.

Wind power has historically been used in sails, windmills, and wind pumps, but it is now primarily used to generate electricity. Wind farms are made up of many individual wind turbines that are linked to an electric power transmission network.

Hence, kinetic energy of wind transforms mechanical energy of the turbines in wind power stations.

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In kinematics, motion equations are derived using the time interval, Δt, between events. Before the concept of special theory of relativity came to be, everyone thought that the time interval, Δt, is the same for every observer, whether the observer is at rest or in motion. This is called absolute time.

However, according to Einstein, time is not absolute; that is, the time interval, Δt, depends upon the velocity of the observer

If the sun shrank in size but its mass remained the same, the Earth's orbit around the Sun would remain unchanged. This is due to the fact that it's the Sun's mass, not its size, that mainly determines the strength of its gravitational pull on Earth.

If the sun were to shrink in size but maintain the same mass, the gravitational pull it exerts on the Earth would remain the same. This is based on Newton's law of universal gravitation, which states that two bodies attract each other with a force proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Therefore, if the sun's mass is unchanged, the Earth's orbit would remain unchanged as well because it is the sun's mass (not its size) that principally determines the strength of its gravitational pull on the Earth.

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The velocity of an object dropped from a height of 300m at the moment it hits the ground is approximately 77.46 m/s.

The subject of the question is on kinematics under gravity, also referred to as free-fall motion. Here, you are asked to find the velocity of an object just before it hits the ground, having dropped from a height of 300m.

We can use the equation of motion for this operation: v² = u² + 2gH, where v is the final velocity, u is the initial velocity, g is the acceleration due to gravity (approx 9.8 m/s²) and H is height. In this case, the object is dropped, meaning its initial velocity (u) is zero. Substituting the values, we have v² = 0 + 2*9.8*300. Solving this, we get v = sqrt(2*9.8*300) = 77.46 m/s (approx). This is the velocity of the object at the moment it hits the ground when it is dropped from a height of 300 m.

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The correct answer to the question is : 2.976 miles/hour.

CALCULATION:

As per the question, the distance travelled by the bird X = 1000 miles.

 The time taken by the bird to cover that distance t = 2 weeks.

                                                                                     = 2 × 7× 24 hours

                                                                                     = 336 hours

We are asked to calculate the speed of the bird.

The speed of the bird is calculated as -

                         speed v = [tex]\frac{distance}{time}[/tex]

                                        = [tex]\frac{1000}{336}\ miles/hour[/tex]

                                        = 2.976 miles/hour                   [ans]

Hence, the velocity of the bird is 2.976 miles/hour.

The answer is 15.0 mL

The weightlifter used approximately 833.33 Watts of power to lift the barbell.

To calculate the power used by the weightlifter to lift the barbell, we need to first determine the work done and then divide it by the time taken to do this work. Power is defined as work done per unit time.

The work ( W ) done when lifting the barbell can be calculated using the formula W = force (F) x distance (d). In this case, the force is equal to the weight of the barbell (1,250 N) and the distance is 2 meters, so the work done would be:

W = F x d = 1,250 N x 2 m = 2,500 Joules

Now, the power ( P) can be calculated using the formula P = W / time ( t). The time taken to lift the barbell is 3 seconds, so:

P = W / t = 2,500 J / 3 s = 833.33 Watts

Therefore, the weightlifter used approximately 833.33 Watts of power to lift the barbell.

Answer : The correct option is, distance times force

Explanation :

Work : It is defined as the force acting on an object to cause a displacement. Or we can defined as the work is equal to the product of the force of an object and displacement of an object.

The formula of the work is written as,

[tex]W=F\times d[/tex]

where,

W = work done

F = force applied on an object

d = displacement of an object

Hence, the work is equal to distance times force.

Work is equal to distance times force in Physics. The force must be directly causing motion of the object for work to be calculated. For instance, pushing a box 5 meters with a force of 10 Newtons would result in 50 Joules of work.

In the field of Physics, work is defined as the force applied on an object times the distance that the object moves. In other words, work is equal to the product of distance times force. The force must be causing the object to move in the direction of the force in order for work to happen. For example, if you push a box 5 meters with a force of 10 Newtons, the work done would be 50 Joules (10 Newtons x 5 meters).

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The movement of electrons due to a difference in electric potential energy is the electric charge.

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Egenuity says the answer is False ^-^

Answer: The given statement is false.

Explanation:

In the United states, both men and women are treated equally and like men, women also work for living.

Also women has the responsibility to do house hold chores so most of the time women are busy with their family or work. Hence, they do not get enough leisure time.

Therefore, the statement women in the United States have 10 hours more leisure time per week than men, is false.

Answer: Yes

Explanation: The definition of displacement is the change on the position, So if i start in my home, then i go to the mall, and after that i return home, the total displacement over that period of time is 0, because i started in my house and ended in my house. But in that proces i traveled the distance between my house and the mall two times. So is possible to travel great distances without any displacement, only if the endpoint of the travel is the same as the start point.

A. The change in kinetic energy is –345.075 J

B. The amount of work done is –345.075 J

C. The cart travelled a distance of 34.51 m

ΔKE = ½m(v² – u²)

ΔKE = ½ × 15 × (3.2² – 7.5²)

ΔKE = 7.5 × –46.01

ΔKE = –345.075 J

The workdone in this case is equal to the change in energy of the cart.

Wd = Fd

Divide both side by F

d = Wd / F

d = –345.075 / –10

d = 34.51 m

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