The bowler threw the 9kg bowling ball with a force
of 90N. What was the bowling ball's acceleration?

Answer:

The recurve bows

Explanation:Vote brainliest plz

Answer:

20

Explanation:

Power is work done per time and work done is force times distance. The power is found by multiplying the force(20N) and the distance(5m) and dividing the product by the time(5s)

(20*5)/5=20Nm/s OR 20 watts.

Therefore the power needed is 20 watts.

Answer:

\(\boxed {\boxed {\sf 20 \ Watts}}\)

Explanation:

Power can be found by multiplying the force by the distance, then dividing by time.

\(P=\frac{F*d}{t}\)

The force is 20 Newtons. The distance is 5 meters. The time is 5 seconds.

\(F=20 \ N \\d= 5 \ m \\t= 5 \ s\)

Substitute the values into the formula.

\(P=\frac{20 \ N \ * \ 5 \ m}{5 \ s}\)

First, solve the numerator.

\(P=\frac{100 \ J }{5 \ s }\)

Divide.

\(P=20 \ W\)

The power to move the box is 20 Watts.

Answer:

A conduct repeated trials and make sure the experiment can be replicated.

Explanation:

Answer:

A conduct repeated trials and make sure the experiment can be replicated.

Explanation:

Answer:

The sea level will be 5m higher in 1667 y (years)

Explanation:

From the question, the rate at which the ocean's level is currently rising is about 3mm per year.

First, we will convert mm (millimeter) to m (meter)

1 mm = 0.001 m

Then,

3 mm = 3 × 0.001 m

= 0.003m

That is, the rate at which the ocean's level is currently rising is about 0.003m per year.

Now, to determine how long it will take for the ocean's level be 5 m higher than now at the given rate,

If the ocean rises 0.003 m in 1 year, then

the ocean will rise 5 m in x years

x = (5 m × 1 year) / 0.003 m

x = 5 / 0.003

x = 1666.67 years

x ≅ 1667 years

Hence, the sea level will be 5m higher in 1667 y (years)

Answer:

b & b

Explanation:

Two stoves were turned off at the same time, and they both started to cool down.

The following equation gives the temperature of the first stove (in degrees Celsius) as a function of time (in minutes).

T = 180-1.55mT=180−1.55mT, equals, 180, minus, 1, point, 55, m

The graph of the temperature of the second stove (in degrees Celsius) as a function of time (in minutes) is shown below.

Which stove started at a higher temperature?

Choose 1 answer:

Choose 1 answer:

(Choice A, Incorrect)

INCORRECT

The first stove

(Choice B, Checked, Correct)

CORRECT (SELECTED)

The second stove

(Choice C, Incorrect)

INCORRECT

The stoves started at the same temperature

Which stove cooled down at a greater rate?

Choose 1 answer:

Choose 1 answer:

(Choice A, Incorrect)

INCORRECT

The first stove

(Choice B, Checked, Correct)

CORRECT (SELECTED)

The second stove

(Choice C, Incorrect)

INCORRECT

The stoves cooled down at the same rate

In order to cause a 62 g particle to move to the right at 51 m/s, net work must be done on the particle.

This is because the particle is currently moving to the left at 29 m/s, and to change its velocity from 29 m/s to 51 m/s, energy must be added to the particle. The amount of energy that would need to be added is equal to the change in kinetic energy of the particle (KEf - KEr).

Since kinetic energy is equal to 1/2 mv², the net work required can be calculated by multiplying the mass of the particle (62 g) by the change in velocity (51 - 29 m/s) squared, divided by two. This work must be performed on the particle in order to cause it to move to the right at 51 m/s.

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Answer:

A. Looking at stick shadows on the equinox.

Explanation:

He measures the circumference by placing a pole when the sun is overhead on the days of solstice. He determined the circumference by measuring the difference between  Alexandria to Syene and the angle of the pole's shadow.

The equation used for the calculation of circumference is as follow

\(\frac{360 degrew}{7.2 degree} = \frac{Circumference of earth}{Distance from Alexandria to Syene}\)

Please refer to the following link for more details

https://www.khanacademy.org/humanities/big-history-project/solar-system-and-earth/knowing-solar-system-earth/a/eratosthenes-of-cyrene

The wavelength of the sound with speed 330m/s and vibrates 660 times a second is 0.5 m.

v = velocity or speed of the sound = 330m/s

Wavelength of the sound can be calculated using this formula,

Wavelength (λ) = speed (v) / frequency (f)

Frequency is the measurement for how many wave vibrates in a second. The questions tell us the sound can be vibrates 660 times a second in Cuthbert ear, so this mean the frequency of the sound is 660 Hz.

So,

λ = v / f

λ = 330 / 660

λ = 0.5 m

Thus, the wavelength of the sound is 0.5 m.

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Answer:

probaby not

Explanation:

you might get thrown in jail tho

Answer:

I think B but I could be wrong

Explanation:

Answer: insert the numbers

Explanation:

displacement = speed x time

insert the numbers

Answer:

it is c

Explanation:

a.p.e.x

i took the test

During photosynthesis, the hydrogen atoms come from water molecules that are split apart by light energy in the process called photolysis. The oxygen atoms, on the other hand, come from the same water molecules as the hydrogen atoms. They are released into the atmosphere as a by-product of photosynthesis. So, both the hydrogen and oxygen atoms that become part of the glucose molecule come from water molecules.

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Answer:

150J

Explanation:

Pi = Pf + Kf

200 = 50 + Kf

---> Kf = 150J

The kinetic energy of the swing at its lowest point is 150 J.

Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.

Given in the question the potential energy of a swing is 200 J at its highest point and 50 J at its lowest point

Pi = Pf + K E

200 = 50 + K E

K E = 150 J

The kinetic energy of the swing at its lowest point is 150 J.

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Answer:

C is correct.

Explanation:

Answer: B

Explanation:

"Constant velocity" means that there is no acceleration. Acceleration = 0 .

So its graph is zero at every time. The line on the graph lies on the X-axis.

The minimum safe distance from the radar unit is given by \(\sqrt{(P / (4\pi SAR_{max}\rho))\).

To calculate the minimum safe distance from the radar unit, we need to use the inverse square law of radiation. The law states that the intensity of radiation decreases with the square of the distance from the source.

Let P be the power of the microwaves leaked by the radar unit, and let r be the distance from the unit. The power per unit area (or intensity) of the microwaves at distance r can be found by dividing the power by the surface area of a sphere with radius r:

\(I = P / (4\pi r^2)\)

To determine the minimum safe distance from the unit, we need to find the distance r such that the intensity of the microwaves is below a safe level. The safe level of exposure to microwaves is typically measured in terms of the specific absorption rate (SAR), which is the amount of energy absorbed per unit mass of tissue.

Let SARmax be the maximum safe level of SAR, and let ρ be the density of the tissue. The safe level of intensity can be found by multiplying SARmax by ρ:

\(I_{safe} = SAR_{max} \times \rho\)

Setting I equal to \(I_{safe}\) and solving for r, we get:

\(P / (4\pi r^2) = SAR_{max} \times \rho\)

\(r^2 = P / (4\pi SAR_{max}\rho )\)

\(r = \sqrt{(P / (4\pi SAR_{max}\rho))\)

Therefore, the minimum safe distance from the radar unit is given by the square root of the leaked power divided by four times the product of pi, the maximum safe SAR level, and the tissue density.

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Answer:

The train's acceleration is 4.5 m/s²

Explanation:

The train's speed increased by 45 m/s after 10 seconds, which means that it's speed increased by 4.5 m/s each second, or rather 4.5m/s²

Answer:

20m s-1 or 20m/s

Explanation:

s=30

v=0 cause it lands

t=3

need to find u

so

use s=[1/2][v+u][t]

30=[1/2][0+u][3]

20=u

u=20m s-1

If there are both electric and magnetic fields in the room and their effects on the charged particle cancel, and the electric field points upward, then the direction of the magnetic field is downwards.

The electric force on a charged particle is provided by an electric field, whereas the magnetic force is provided by a magnetic field. The effect of the electric and magnetic fields on the motion of the particle is a function of the relative directions and magnitudes of the two fields.

If the magnetic field is perpendicular to the electric field and the particle's velocity, the magnetic force is at right angles to both the electric force and the velocity, and it does not adjust the particle's speed. If the electric and magnetic forces on a charged particle are equal and opposite, they cancel each other out, resulting in no acceleration of the charged particle. Since the electric field is pointing upward, the magnetic field should be pointing downward.

In conclusion, the direction of the magnetic field is downward if the electric field is pointing upward, according to the given condition.

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Answer:

Devni is correct

Explanation:

The relationship between pressure and density of a liquid is directly proportional i.e. the amount of pressure exerted on a liquid is directly proportional to its density and this is because when pressure is exerted the volume is compressed hence there will be a proportional increase in density as well.

hence pressure is as important as density in liquids

The term for the electrical force that occurs when two charges have a difference in potential is electric potential difference, or voltage.

When there is a difference in electric potential between two points in an electric circuit, electric charges will flow from the point of higher potential to the point of lower potential, creating an electric current. Voltage is a measure of the energy required to move a unit of electric charge between two points in a circuit.

The unit of measurement for voltage is the volt (V), named after Italian physicist Alessandro Volta. One volt is defined as the electric potential difference between two points in a circuit when one joule of energy is used to move one coulomb of electric charge between those points.

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The minimum resolvable difference between two wavelengths (Δλ) is approximately 0.027 nm for a  6900 line/cm diffraction whose grating is 3.42 cm wide

To find the minimum resolvable difference between two wavelengths (Δλ) using a diffraction grating, we can use the Rayleigh criterion and the grating equation.

1. Calculate the total number of lines (N) on the grating:
N = (lines/cm) × (width of grating in cm)
N = 6900 × 3.42
N = 23618

2. Use the Rayleigh criterion (Δλ = λ / (N × m)), where λ is the wavelength and m is the order of the spectrum:
Δλ = 629 nm / (23618 × m)

Since we need to find the smallest possible Δλ, we'll use m = 1 (the first order of the spectrum):
Δλ = 629 nm / (23618 × 1)
Δλ ≈ 0.027 nm

Expressing the answer using two significant figures:
Δλ ≈ 0.027 nm

So, the minimum resolvable difference between two wavelengths (Δλ) is approximately 0.027 nm.

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If a person pushed on the door to the left of the handle, they would need to use less force than if they used the handle.

The reason for this is that the handle provides a mechanical advantage over pushing directly on the door. When the handle is used, the force applied to it is multiplied by the mechanical advantage, which is the ratio of the distance through which the handle moves to the distance through which the door moves.

For example, if the handle moves the door a distance of 2 cm and the door moves a distance of 5 cm when pushed directly on it, the mechanical advantage is 2:5, or 0.4. This means that for every 0.4 units of force applied to the handle, the door moves 1 unit.

On the other hand, if the person pushed directly on the door, the force applied to it would be the same as the force applied to the door, without any mechanical advantage. In this case, the door would move 5 cm, not 2 cm, for every unit of force applied to it.

Therefore, the person would need to use more force if they pushed directly on the door than if they used the handle, because they would have to apply the same amount of force over a greater distance to move the door the same distance.  

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Explanation:

convert 1= 30 amp

which Car has the dead

battery ?

CarA

Car B

Ams => The Current i flows into the of the Battery of Qax A.

Posithe terminal

So. By using Passinge sign Convention.

Power P₁ = Vi = 12X 30

PA = 360 Watt (the)

=>Power is Positive So Car Ahabsorbing So now we can say car A has dead battery.

Power,

Connection is maintained for t = 1 min. Energy toonsffered to the dead battery

=> we know w(t) = Work = Emergy t S. Pdt fo W (1 = imin) = 360 dt

t = 60 sec = 1 min.

36. (t), 60

360 X60

|w[t=1mm) = 21.60 *Jure.

Answer:

D: The ability to do work or cause change.

Explanation:

Energy can be defined as the ability to do work. We apply energy in basically everything we do in life, energy is needed to walk or move from one position to another, it is required to eat and do other basic things of life. The body system converts the food that is being consumed into energy, this energy can be switched from one form to another.

There are various forms of energy which include solar energy, wind energy, electrical energy, mechanical energy, kinetic energy, potential energy, etc. This form of energy can be converted from one form to another but cannot be destroyed.

Hope this helps :)

Answer:

1 kg is defined as the mass of a cylindrical Platinum iridium alloy whose height is equal to its diameter

Answer:

3 m/s^2

Explanation:

Acceleration = change in speed  /  change i time

                      = 15 m/s  / 5 s =  3 m/s^2

Answer:

24.1402

Explanation: