A vector quantity is always the same as a scalar quantity.
True or false

Answer:

86.6Nm(j)

Explanation:

we know,

w=Fd

w=17.32*5

w=86.6Nm.

as we know the distance but we doesnot know the exact force .becauseit acts at an angle.This mean the orginal force of 20N is essentially split up in 2 direction in along axis of displacement ,and perpendincular direction that occur at 30degree angle.

the resultant displacement of object is along a line inclined by 30 degrees of that orginal plane ,then the force acting in the direction of that displacement equal to 20*cos30.I.e,17.32 .

Answer: contain different amounts of energy

Explanation:

The energy [tex]E[/tex] of a photon is given by:

[tex]E=h\nu[/tex]

Where:

[tex]h=6.626(10)^{-34}\frac{m^{2}kg}{s}[/tex] is the Planck constant

[tex]\nu[/tex] is the frequency of the light which is inversely related to the wavelength.

Now, if we have photons of different light waves, this means we have photons with different frequencies.

As the energy of the photon depends on its frequency:

Photons of different light waves contain different amounts of energy.

Photons of different light waves carry different amounts of energy that are proportional to their frequency.

Photons of different light waves contain different amounts of energy. The energy of a photon is proportional to its frequency. A high-frequency wave carries higher energy photons, while a low-frequency wave carries lower energy photons.

Answer:

75%

Explanation:

I assume the effort is 200 N, not 2000.

The load is 20 cm from the fulcrum, and the crowbar is 1 m long, so the effort is applied 80 cm from the fulcrum.  So the theoretical load that can be raised is:

20 cm × F = 80 cm × 200 N

F = 800 N

But the actual load is 600 N.  So the efficiency is:

e = 600 N / 800 N

e = 0.75

The efficiency of the crowbar is 75%.

Answer: [tex]a_{apple}=9.082m/s^{2}[/tex], [tex]a_{Earth}=3.027(10)^{-25}m/s^2[/tex]

Explanation:

According to Newton’s law of universal gravitation, which is a classical physical law that describes the gravitational interaction between different bodies with mass:  

[tex]F=G\frac{Mm}{r^2}[/tex] (1)

Where:  

[tex]F[/tex] is the module of the force exerted between the apple and the Earth

[tex]G=6.674x10^{-11}\frac{m^{3}}{kgs^{2}}[/tex] is the universal gravitation constant.  

[tex]M=6(10)^{24}kg[/tex] is the mass of the Earth and [tex]m=200g=0.2kg[/tex] is the mass of the apple

[tex]r=6.64(10)^{6}m[/tex] is the distance between the apple and the Earth (assuming tha apple is near the surface of the Earth)

On the other hand, according Newton's 2nd Law of Motion the force [tex]F[/tex] is directly proportional to the mass [tex]m[/tex] and to the acceleration [tex]a[/tex] of a body.  

So, in the case of the apple:  

[tex]F=m.a_{apple}[/tex] (2)

[tex]a_{apple}=\frac{F}{m}[/tex] (3)

Substituting [tex]F[/tex] (1) in (3):

[tex]a_{apple}=\frac{F}{m}=G\frac{M}{r^2}[/tex] (4)

[tex]a_{apple}=6.674x10^{-11}\frac{m^{3}}{kgs^{2}}\frac{6(10)^{24}kg}{(6.64(10)^{6}m)^2}[/tex] (5)

[tex]a_{apple}=9.082m/s^2[/tex] (6)

Now, in the case of the Earth:  

[tex]F=M.a_{Earth}[/tex] (7)

[tex]a_{Earth}=\frac{F}{M}[/tex] (8)

Substituting [tex]F[/tex] (1) in (8):

[tex]a_{Earth}=\frac{F}{M}=G\frac{m}{r^2}[/tex] (9)

[tex]a_{Earth}=6.674x10^{-11}\frac{m^{3}}{kgs^{2}}\frac{0.2kg}{(6.64(10)^{6}m)^2}[/tex] (10)

[tex]a_{Earth}=3.027(10)^{-25}m/s^2[/tex] (11)

As we can see, the acceleration of the apple towards the Earth is greater than the acceleration of the Earth towards the apple (although the gravitational force between them is the same), because the mass of the Earth is greater than the mass of the apple.

Explanation:

Average velocity = change in position over change in time.

v = (x − x₀) / t

Average velocity is defined as the displacement divided by the time of travel.

Average velocity is defined as the displacement (change in position) divided by the time of travel. It can be calculated using the formula:

Average velocity = Displacement / Time

For example, if an object moves 100 meters and takes 10 seconds to do so, the average velocity would be 10 meters per second.

Answer: Yes

Explanation: The Sun like all other stars will eventually go through nuclear fusion. But for a very long time (about 5 billion years) When it does it is more than likely that it will consume the earth as the sun will expand very larger during the process and become a red giant.

The Sun will 'burn out' over a timeline of billions of years as it exhausts its hydrogen fuel, eventually expanding into a red giant and later leaving behind a cooling white dwarf.

The Sun, which has been shining for about 4.5 billion years, radiates an immense amount of energy due to nuclear fusion occurring in its core. This process involves fusing hydrogen atoms into helium, releasing energy in the form of light and heat. However, the Sun's hydrogen fuel is finite and will eventually be exhausted. In roughly 5 billion years, the Sun will expand into a red giant, engulfing the inner planets. Subsequently, it will shed its outer layers and leave behind a white dwarf. The transition to a red giant will mark the end of the Sun's ability to support life on Earth as we know it. As this white dwarf cools over billions of years, the Sun will indeed 'burn out,' but over a timeline that greatly surpasses human history. Hence, the fate of the Sun is to ultimately cease shining, but this eventuality lies far in our planet's future.

Answer:

it must have lived through a long span of time

Answer:Option (1)

Explanation: Index fossil are those fossils that appears for a very short period of time in the geological time scale and has a wide geographical distribution. For example, Ammonites.

Index fossils are a good source for rock age determination and also it helps in the correlation of rocks.

Thus, the correct answer is option (1).

Answer

Gravitational force is between two object caused by energy in mass. Here when you are in a mine the radius of the earth in case of calculating gravity is reduced to the length between you and the center.

This means the mass of earth is decreasing even though the distance is decreasing. Relative to the decrease in distance squared the decrease in the mass of the second object(earth) is more. As a result your weight decreases.

Answer:

Explanation: that means as you descend into the earth, all of the mass in all the shells above you gets canceled. If the centre of the earth were not molten iron, but instead hollowed out, you would be weightless inside.

The physics problem is actually a little more general. It applies to inverse square force laws such as the electrical force. So if you put an electron inside a positively or negatively charged sphere, it will also have a net force on it of zero.

Answer:

Right Hand Rule

Explanation:

When a charged particle travels in a magnetic field, it experiences a force whose magnitude is given by:

[tex]F=qvBsin\theta[/tex]

where

q is the charge of the particle

v is the velocity

B is the magnetic field strength

[tex]\theta[/tex] is the angle between the directions of v and B

The direction of the force can be determined by using the Right Hand Rule, as follows:

- index finger: this should be put in the direction of the velocity

- middle finger: this should be put in the direction of the magnetic field

- thumb: this will give the direction of the force -> however, for a negative charge (as the electron) the direction must be reversed, so it will be opposite.

Answer:

right hand rule

Explanation:

Answer:

9.2 N

Explanation:

F = ma

F = m Δv / Δt

F = (0.150 kg) (4.4 m/s − 0 m/s) / 0.072 s

F = 9.2 N

Answer:

9.2Newtons

Explanation:

Just got it right on edg

Answer:

1) Any particle moving in a horizontal plane slowed by friction, deceleration = 32 μ

2) The particle moving by acceleration = P/m - 32μ OR The external force = ma + 32μm

Explanation:

* Lets revise Newton’s Third Law:

- For every action there is a reaction, equal in magnitude and opposite

 in direction.

- Examples:

# 1) A particle moving freely against friction in a horizontal plane

- When no external forces acts on the particle, then its equation of

  motion is;

∵ ∑ forces in direction of motion = mass × acceleration

∵ No external force

∵ The friction force (F) = μR, where μ is coefficient of the frictional force

   and R is the normal reaction of the weight of the particle on the

   surface

∵ The frictional force is in opposite direction of the motion

∴ ∑ forces in the direction of motion = 0 - F

∴ 0 - F = mass × acceleration

- Substitute F by μR

∴ - μR = mass × acceleration

∵ R = mg where m is the mass of the particle and g is the acceleration

  of gravity

∴ - μ(mg) = ma ⇒ a is the acceleration of motion

- By divide both sides by m

∴ - μ(g) = a

∵ The acceleration of gravity ≅ 32 feet/sec²

∴ a = - 32 μ

* Any particle moving in a horizontal plane slowed by friction,

 deceleration = 32 μ

# 2) A particle moving under the action of an external force P in a

  horizontal plane.

- When an external force P acts on the particle, then its equation

 of motion is;

∵ ∑ forces in direction of motion = mass × acceleration

∵ The external force = P

∵ The friction force (F) = μR, where μ is coefficient of the frictional force

   and R is the normal reaction of the weight of the particle on the

   surface

∵ The frictional force is in opposite direction of the motion

∴ ∑ forces in the direction of motion = P - F

∴ P - F = mass × acceleration

- Substitute F by μR

∴ P - μR = mass × acceleration

∵ R = mg where m is the mass of the particle and g is the acceleration

  of gravity

∴ P - μ(mg) = ma ⇒ a is the acceleration of motion

∵ The acceleration of gravity ≅ 32 feet/sec²

∴ P - 32μm = ma ⇒ (1)

- divide both side by m

∴ a = (P - 32μm)/m ⇒ divide the 2 terms in the bracket by m

∴ a = P/m - 32μ

* The particle moving by acceleration = P/m - 32μ

- If you want to fin the external force P use equation (1)

∵ P - 32μm = ma ⇒ add 32μm to both sides

∴ P = ma + 32μm

* The external force = ma + 32μm

Answer:

200 N

Explanation:

Power = work / time

Work = force × distance

Therefore:

Power = force × distance / time

100 W = F × 10 m / 20 s

F = 200 N

He exerted 200 N.

Answer:

200 N

Explanation:

There are no true statements on the list you posted.

Answer:

The value 9.8 corresponds to g, the acceleration due to gravity in SI units.

Explanation:

This is the answer on Edmentum. :)

The acceleration due to gravity on earth is also known as the value of g on earth is 9.8 m/s2.

Its SI unit is m / s2. It has both magnitude and direction, therefore, a vector value. Acceleration due to gravity is represented by g. The average g g surface at sea level is 9.8 m / s2.

The gravitational force of gravity weighing 1 kg on Earth is 9.8 N. Another way to put that is the gravitational force on the Earth's surface is 9.8 N / kg.

Learn more about acceleration due to gravity here: https://brainly.com/question/88039

#SPJ2

Explanation:

the process by which heat or electricity is directly transmitted through the material of a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.

Final answer:

Conduction is the process of transferring heat through direct contact between two objects at different temperatures, as seen when you hold a glass of ice water or cook a steak on a skillet.

Explanation:

Conduction is the process of heat transfer through stationary matter by means of physical contact. Heat essentially moves from a higher temperature region to a lower temperature one within the material. It's the same mechanism at play when an electric burner transfers heat to the bottom of a pan, where the particles in the pan attain energy from the particles of the burner by direct contact.

A common experience with conduction is when you hold a glass of ice water and the heat from your hand is transferred to the glass, subsequently melting the ice.

Conduction is also a key process during cooking when, for example, a steak absorbs heat from a hot iron skillet. In both scenarios, heat is conveyed by the energetic motion and collision of particles from a warmer body (the hand or the skillet) to a colder one (the glass or the steak)

The distance between the Sun and the Jupiter is nearly 779 million kilometer.

Explanation:

Jupiter is approximately 778.5 million kilo meter from the Sun, it is in approximation of 484 million miles. To be exact in separating distance between the two, it is 778547200 kilo meters.

The distance measured is an average taken due to the elliptical path undertaken by the planet for its planetary motion around the Sun, according to the Kepler’s law of planetary motion.

Explanation:

Heat = mass × specific heat × temperature change

q = m C ΔT

Given:

q = 337500 J

m = 50 kg

ΔT = 15°C

Substitute:

337500 J = (50 kg) C (15°C)

C = 450 J/kg/°C

Specific heat is usually recorded in J/g/°C or kJ/kg/°C.  Converting:

C = 0.45 J/g/°C = 0.45 kJ/kg/°C

Final answer:

The specific heat of the object is calculated using the formula Q = mcΔT. Upon substituting the values provided into the formula and rearranging it to solve for specific heat (c), we determine that the specific heat of the object is 450 J/kg°C.

Explanation:

To calculate the specific heat of the object, we use the formula:

Q = mcΔT

Where:

Q is the amount of heat added, in joules

m is the mass of the object, in kilograms

c is the specific heat capacity, in J/kg°C

ΔT is the change in temperature, in degrees Celsius (or Kelvin, since the change is the same in both scales)

We are given the following values:

Q = 337,500 J

m = 50 kg

ΔT = 15°C

We rearrange the formula to solve for c:

c = Q / (mΔT)

Plugging in the values:

c = 337,500 J / (50 kg × 15°C)

c = 337,500 J / 750 kg°C

c = 450 J/kg°C

Therefore, the specific heat of the object is 450 J/kg°C.

Explanation:

sin² A sec² B + tan² B cos² A

A good first step is to write everything in terms of sine and cosine.

sin² A / cos² B + sin² B cos² A / cos² B

The fractions have the same denominator, so combine into one:

(sin² A + sin² B cos² A) / cos² B

Using Pythagorean identity, we can rewrite sin² B as 1 − cos² B:

(sin² A + (1 − cos² B) cos² A) / cos² B

Distribute:

(sin² A + cos² A − cos² B cos² A) / cos² B

Pythagorean identity:

(1 − cos² B cos² A) / cos² B

Now divide into two fractions again:

1 / cos² B − cos² B cos² A / cos² B

Simplify:

sec² B − cos² A

Using Pythagorean identity again:

(tan² B + 1) − (1 − sin² A)

tan² B + 1 − 1 + sin² A

tan² B + sin² A

Answer:

2 seconds

Explanation:

v = at + v₀

19.62 m/s = (9.81 m/s²) t + 0 m/s

t = 2 s

Answer:

A. 19.6 m/s

B. 44.6 m

C. 5.0 s

D. -19.6 m/s

Explanation:

At the highest point, the stone's velocity is 0.

A. Given:

v = 0 m/s

t = 2 s

a = -9.8 m/s²

Find: v₀

v = at + v₀

0 = (-9.8)(2) + v₀

v₀ = 19.6 m/s

B. Given:

y₀ = 25 m

t = 2 s

v₀ = 19.6 m/s

a = -9.8 m/s²

Find: y

y = y₀ + v₀ t + ½ at²

y = 25 + (19.6)(2) + ½(-9.8)(2)²

y = 44.6 m

C. Given:

y₀ = 25 m

y = 0 m

v₀ = 19.6 m/s

a = -9.8 m/s²

Find: t

y = y₀ + v₀ t + ½ at²

0 = 25 + (19.6)t + ½(-9.8)t²

0 = 4.9t² − 19.6t − 25

t ≈ 5.0 s

D. Given:

v₀ = 19.6 m/s

a = -9.8 m/s²

t = 4 s

Find: v

v = at + v₀

v = (-9.8)(4) + 19.6

v = -19.6 m/s

The velocity is -19.6 m/s.  If you want the speed, or magnitude of the velocity, take the absolute value: 19.6 m/s.

Answer:

The forth one

Explanation:

8N of net force is applied to the golf ball

Answer:

2500

Explanation:

1 Angstrom (1 A) corresponds to

[tex]1 A = 10^{-10} m[/tex]

Therefore we can convert the wavelength of the light from Angstroms to meters:

[tex]\lambda = 4000 A = 4000 \cdot 10^{-10} m = 4\cdot 10^{-7} m[/tex]

We also know that

[tex]1 mm = 1\cdot 10^{-3} m[/tex]

So the number of waves in 1 mm of distance is:

[tex]n=\frac{1\cdot 10^{-3} m}{4\cdot 10^{-7} m}=2500[/tex]

The potential difference across 3 Ohm resistor is 20V.

The resistors are connected in parallel which means all the three resistances have a fully potential difference of 20V.

Answer:

Neil Armstrong and Pilot Buzz Aldrin.

Explanation:

Neil Armstrong and Pilot Buzz Aldrin were the first people on the moon.

This happened on July 20, 1969, at 8:17.

Final answer:

The potential energy of a 0.005 kg coin dropped from a height of 3 m, right before it hits the ground, can be calculated using the formula PE = mgh. The calculated potential energy is 0.147 joules.

Explanation:

To calculate the potential energy of the coin right before it hits the ground, we need to use the formula for gravitational potential energy, which is PE = mgh, where m is the mass, g is the acceleration due to gravity, and h is the height from which the object falls.

In this scenario:

Mass (m) of the coin = 0.005 kg

Acceleration due to gravity (g) = 9.8 m/s²

Height (h) from which the coin is dropped = 3 m

Substituting these values into the formula, we get:

PE = (0.005 kg) × (9.8 m/s²) × (3 m)

PE = 0.147 J

Therefore, the potential energy of the coin right before it hits the ground is 0.147 joules.

Explanation:

the frequency of the wave increase is the right answer

Answer:

B

Explanation:

The other two choices are exact. B is estimating and giving an indirect observation.

b. scientist traps fish and  

estimates the population of male and female fish based on the ratios of fish he trapped.

The key word is estimate. Estimate means that he gives a rough number. There aren't exactly that number of fish.

A. and C. are both exact numbers because the scientists manually count each one. This means these are direct observations, and therefore not the answer.

Hope this helped!

~Just a girl in love with Shawn Mendes

wavelength frequency and other

Explanation:

Waves travel through a medium: A medium is any substance or region through which a wave is transmitted. The speed of a wave is dependant on four factors: wavelength, frequency, medium, and temperature. Wave speed is calculated by multiplying the wavelength times the frequency (speed = l * f).

Final answer:

The speed of a wave depends primarily on the medium's characteristics, such as elasticity, inertia, pressure, density, and temperature for sound waves, and tension and linear mass density for waves on a string.

Explanation:

The speed of a wave is influenced by the properties of the medium through which it propagates. Factors such as the elasticity of the medium and the inertia of its particles, which are measures of the medium's ability to return to equilibrium and the mass of the particles, respectively, play significant roles in determining wave speed. The speed is not dependent on the wave's amplitude or the energy of the generating mechanism but on the medium's physical properties. For example, the speed of sound waves is affected by the density, pressure, and temperature of air, while the speed of a wave on a string is proportional to the square root of the tension in the string and inversely proportional to the square root of the linear mass density. The wave speed can therefore be experimentally determined using its relationship with the medium's properties.