what is the difference between mass and weight and how they are measured

Answer:

The amount of gravity affecting an object depends on two things: the masses of the objects being attracted and the distance between the objects. Mass is the measure of the amount of matter in an object. With distance, we see that the strength of gravity decreases if the distance between two objects increases.

Hope this helps!

Explanation:

Power = work / time

Power = force × distance / time

P = (12 kg × 10 m/s²) (8 m) / (10 s)

P = 96 Watts

The average power used in raising the bucket against the gravitational force is equal to 94.08 W.

Power can be defined as the rate of doing work in unit time. The S.I. unit that is used to measure power is Watt (W) or Joule per second. Power can be described as the rate at which work is done.

Power = Work /time

Given, the mass of the bucket, m = 12 kg

The distance traveled by the bucket, d = 8 m

The work is done by the bucket, W = F.d

W = mg.d

W = 12 × 9.8 ×8

W = 940.8 J

Given, the time is taken by the bucket, t = 10 s

The power used in raising the bucket against the gravitational force:

P = W/t

P = 940.8/10

P = 94.08 W

Therefore, the average power is equal to 94.08 W.

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Answer:

Explanation:

pressure due to fluid  column = hdg where h is height of column , d is density of fluid , g is acceleration due to gravity .

Total pressure on the diver = atmospheric pressure + pressure due to water

= .70 x 13600 x 10 + 15 x 1050 x 10  

= 95200 + 157500

= 252700 Pa

= 2.527 x 10⁵ Pa .

Answer:

constant acceleration,

Explanation:

when an object is moving without any change in direction,its acceleration is regarded as zero which also means that the object is moving at a constant acceleration.

If no forces are acting on a moving object, the object will continue to move with constant momentum.

To find the answer, we need to know about the force.

Thus, we can conclude that if no forces are acting on a moving object, the momentum is constant.

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☄ Universal Gravitational Constant(G)

Gravitational constant is a constant of proportionality when F(Gravitational force) is proportional to product of masses and inversely proportional to the distance between them.

The value of G (universal gravitational constant) was found out by the scientist Henry Cavendish by using the sensitive torsion balance[tex].[/tex]

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Answer:

Here is the answer. Hope this helps you!

Explanation:

Now, from Universal law of gravitation, we come to know that:

F= force of attraction

M = the object with greater mass (taken from centre of the objects)

m = object with smaller mass (taken from centre of the objects)

d = distance (taken from centre of the objects)

F ∝ Mm

F ∝ 1/d²

Therefore, we get the formula

F ∝ Mm/d²

F = GMm/d²

Here, G is the constant of proportionality. It also accepted as the Universal gravitation constant. It has a value of 6.67*10^-11 Nm^2/kg^2.

The universal gravitation constant has allowed us to use the above formula to help us calculate and come to know about

Answer:

The sound waves have larger wavelength than light waves. These are diffracted by the corner of wall and light waves cannot do so, due to their very small wavelength (as compared with size of wall corner). So, without seeing the friends his/her voice can be heard.

The sound wave has a longer wavelength as compared to light waves and due to diffraction the sound wave reaches your friend around a corner, but the light wave can't.

Sound is a mechanical disturbance that travels through an elastic medium and disrupts an equilibrium condition. It is also feasible to define sound solely subjectively, as that which is perceived by the ear.

Although this definition lacks clarity and is overly pedantic because it is necessary to discuss noises that cannot be heard by the human ear, such as those made by dog whistles or sonar devices.

Compared to light waves, sound waves have a longer wavelength. Since light waves have a very short wavelength, they cannot be diffracted by a corner of a wall (as compared with the size of wall corner). He or she can therefore be heard even when the friends are not seen.

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Answer:

hello i need points i need to pass 8th grade

Explanation:

Answer:1.examples are Plank,Body weight squats,Walking lunges,Pushups 2. Weight-Lifting require the most muscle endurance.3. u shud do it urself .4.u shud pick.

Explanation: for the question  Explain why this group is important to keep strong.​

Benefits of Muscular Strength and Endurance

Muscular strength and endurance are important for many reasons: Increase your ability to do activities like opening doors, lifting boxes or chopping wood without getting tired. Reduce the risk of injury. Help you keep a healthy body weight.

Answer:

Mass=3,height=50 and time=15,g=10,P=?

P=mgh/t....which is 3×10×50=1500/15=100Watts

Answer:

[tex]\huge \boxed{\mathrm{100 \ Watts}}[/tex]

Explanation:

[tex]\sf \displaystyle P=\frac{mgh }{t} \\\\\\ P=power \ (W) \\\\ m=mass \ (kg) \\\\ g=gravity \ acceleration \ (m/s^2) \\\\ h=height \ (m) \\\\ t=time \ taken \ (s)[/tex]

[tex]\sf \displaystyle P=\frac{3 \times 10 \times 50 }{15}[/tex]

[tex]\sf \displaystyle P=\frac{1500 }{15}[/tex]

[tex]\sf \displaystyle P=100[/tex]

Answer:

Here is the answer. Hope this helps you!

Explanation:

Average velocity is the sum of initial and final velocity divided by 2. I t is the same as total Displacement divided by total time. Average velocity is calculated when the body is in non-uniform motion (also when total displacement and time is not given). The formula is as follows:

u + v/2 = [tex]v_{av}[/tex]

Average velocity = Average speed

during motion in a straight line. therefore, the above mentioned formula can be used for calculating average speed as well, when the direction is one and only the same, that is, during motion in a straight line. The S.I unit remains the same-

m/s.

Since velocity is vector, average VELOCITY is also vector. However, Average SPEED is scalar as speed is scalar. both can be equal only when the distance = displacement and when they are following the same direction of motion.

Answer:

kinetic energy is 1/2mv^2.

which is 1/2×5×10^2.

1/2×5×100=

250J.

Answer:

The correct answer would be 250 J.

Find time when it strikes ground.

s = ut + 1/2 at²

We will first calculate the time taken by the ball to reach the highest point by using the formula:

S = ut + 1/2 at²

★ Substituting the values in the above formula,we get:

⇒ -40 = 10 × t + 1/2 × -10 × t²

⇒ -40 = 10t + ( - 5 ) × t²

⇒ -40 = 10t - 5 t²

⇒ 5t² - 10t - 40

⇒ 5t² - 20t + 10t - 40

⇒ 5t ( t - 4 ) + 10 ( t - 4 )

⇒ t - 4 = 0 and 5t + 10 = 0

⇒ t = 4 and t = -2

Thus,time taken is 4 seconds. [ Ignore negative number. ]

Answer:

[tex]\Huge \boxed{\mathrm{4 \ s}}[/tex]

Explanation:

Displacement ⇒ -40 m (the ball strikes the ground)

Initial velocity ⇒ 10 m/s

Acceleration of gravity ⇒ -10 m/s² (upward acceleration)

We can use a formula to find the time taken.

[tex]s = ut + 1/2 at^2[/tex]

[tex]s = \sf displacement \ (m)[/tex]

[tex]u = \sf initial \ velocity \ (m/s)[/tex]

[tex]a = \sf acceleration \ of \ gravity \ (m/s^2)[/tex]

[tex]t = \sf time \ taken \ (s)[/tex]

Plugging in the values.

[tex]-40 = (10)t + 1/2 (-10)t^2[/tex]

Solve for [tex]t[/tex].

[tex]-40 = 10t-5t^2[/tex]

[tex]5t^2-10t-40=0[/tex]

Factor the quadratic expression.

[tex]5(t+2)(t-4)=0[/tex]

Set the factors equal to 0.

[tex]t+2=0\\t=-2[/tex]

[tex]t-4=0\\t=4[/tex]

t = -2 and t = 4 (time value will not be negative in this case)

The time the ball takes to strike the ground is 4 seconds.

Explanation:

Acceleration is the change in velocity over change in time.

a = Δv / Δt

So it is the slope of the line of a velocity vs. time graph.

a = (10 m/s − 40 m/s) / (12 s − 0 s)

a = -2.5 m/s²

Answer:

The star, Alpha Crucis, is brighter than the star, Alpha Centauri, when observed from Earth

Explanation:

The given parameters are;

The apparent magnitude of the star Alpha Centauri = -0.27

The apparent magnitude of  the star Alpha Crucis = 0.77

Let relative brightness of two stars is given by the relation

[tex]\dfrac{b_1}{b_2} = 2.512^{(m_1 - m_2)}[/tex]

Where;

m₁ = The apparent magnitude of the star Alpha Centauri = -0.27

m₂ = The apparent magnitude of  the star Alpha Crucis = 0.77

b₁ = The brightness of the star Alpha Centauri

b₂ = The brightness of the star Alpha Crucis

Which gives;

[tex]\dfrac{b_1}{b_2} = 2.512^{(-0.27 - 0.77)}= 0.383689[/tex]

Therefore;

b₁/b₂ = 0.383689 and

b₁ = b₂ × 0.383689

b₂ = b₁/0.383689 = 2.606×b₁

b₂ = 2.606×b₁

b₂ > b₁, b₂ is brighter than b₁, that is the star, Alpha Crucis is brighter than the star, Alpha Centauri, when observed from Earth.

Answer:

725 x10^-9m

Explanation:

We know that the optical path difference is (ax)/D

Where

a=2.11mm

D=1.60m

x= position on the screen

the optical path differences varies of lambda = wavelength

That is BTW two bright fringes

So therefore

x2-x1=lambda x D/a

lambda = ( x2 - x1) x a/D = 0.55 x 10^-3 x 2.11E-3 / 1.60 = 725nm

Answer: 1300m

Explain: from km to m times 1000

[tex] \bf \underline{ \underline{given : }}[/tex]

[tex]\bf \underline{ \underline{to \: be \: calculated : }}[/tex]

Calculate the distance covered by a kangaroo.

[tex]\bf \underline{ \underline{formula \: applied : }}[/tex]

[tex] \boxed{ \bf{Speed = \frac{Distance}{Time} }}[/tex]

[tex]\bf \underline{ \underline{Solution : }}[/tex]

We know that,

Speed = Distance/Time

=> Distance = Speed × Time

Substituting the values in the above formula,we get;

=> Distance = 18 × 192

=> Distance = 3456 m

Thus,the distance covered by a kangaroo is 3456 meters.

Answer:

he switch is open when the magnetic field is activated, a magnetic force is applied to the reed, which causes it to move, closing the circuit and allowing the lock to open.

Explanation:

The reed switches, this is metallic, generally iron, in general the switch is open when the magnetic field is activated, a magnetic force is applied to the reed, which causes it to move, closing the circuit and allowing the lock to open.

The force is given by

                 F = i l x B

In the systems when the switch is depressed the magnetic field is created in a solenoid and this field attracts the metal of the reed.

Explanation:

Acceleration is change in velocity over change in time.

a = Δv / Δt

a = (10 m/s − 5 m/s) / 4 s

a = 1.25 m/s²

Work = force × distance

First, find the distance traveled.

v² = v₀² + 2aΔx

(10 m/s)² = (5 m/s)² + 2 (1.25 m/s²) Δx

Δx = 30 m

Now find the work:

W = (600 kg × 1.25 m/s²) (30 m)

W = 22,500 J

Alternative, work = change in energy.

W = ΔKE

W = ½ mv² − ½ mv₀²

W = ½ m (v² − v₀²)

W = ½ (600 kg) ((10 m/s)² − (5 m/s)²)

W = 22,500 J

Answer:

probably ounces or grams

Explanation:

Answer:

uh,Free fall is the motion of a body where its weight is the only force acting on an object.

Answer:

0.4m/s

Explanation:

It is given speed so it is scalar.

distance covered in 1 round = 180m

therefore, distance covered in 4 rounds = 180*4 = 720m

time = 30 mins = 30*60 = 1800 seconds

average speed = total distance/total time taken

= 720/1800

= 0.4m/s

Answer:

Explanation:

Given the maximum speed limit on interstate 10 as 75 miles per hour, to get the speed in meter per seconds, we need to convert the given speed to meter per seconds.

Using the conversion 1 mile = 1609.34m and 1 hour = 3600 seconds

75 miles perhour = 75miles/1 hour

75miles/1 hour (in m/s) = 75miles*1609.34m* 1 hour/1mile * 1 hour * 3600s *

= 75 *1609.34m* 1 /1 * 1 * 3600s

= 120,700.5m/3600s

= 33.53m/s

Hence the maximum speed limit on interstate 10 in metre per seconds is 33.53m/s

Answer:

= 40 km/hr

Explanation:

speed = distance / time

= 22km / 0.55 hr.

= 40 km/hr

Answer:

The thickness of the hair is 4.0764x10^-5 m

Explanation:

2t=mL (L is wavelength)

2t = 129x632 (124 is used because m starts at 0)

2t = 81528

t = 40764

t = 4.0764x10^-5 m

If a phase shift occur, then we use;

2t = (m + 1/2)L and

2t = (129 + 1/2)632

2t = 81844

t = 40922

t = 4.0922x10^-5 m

The answers are almost the same.

Answer:

we need to see the answers but probably 1 or -1

Answer:

Explanation:

Animal cells and plant cells share the common components of a nucleus, cytoplasm, mitochondria and a cell membrane. Plant cells have three extra components, a vacuole, chloroplast and a cell wall.

Answer:

Moving the magnet away from the center of the loop with its south pole facing the center of the loop.

Explanation:

Electromagnetic induction is due to a rapidly changing magnetic field, or loop area. The poles of the magnet induce current in the loop but in the opposite direction, depending on the direction of their relative motion. An approaching north pole will induce an anticlockwise current in the loop, while an approaching south pole will do the reverse. To get the galvanometer to flicker in the same direction as of that when the north pole was approaching, we move the magnet away from the center of the loop with its south pole facing the center of the loop.

Answer:

True, yes terminal voltage of a battery can never be greater than the emf of the battery. Because due to internal resistance of the current terminal

Answer:

Bone homeostasis involves multiple but coordinated cellular and molecular events. Two main types of cells are responsible for bone metabolism: osteoblasts (which secrete new bone), and osteoclasts (which break bone down).

Explanation:

Answer:

  a = 12 m / s²

Explanation:

Let's apply Newton's second law

             F = m a

where F is the force, m the mass of the body and the acceleration

we clear

            a = F / m

let's calculate

           a = 180/15

           a = 12 m / s²

this acceleration has the same direction of the force