Find the velocity of a runner who has a mass of 75 kg and 3,700 Joules of energy.

Answer:

it's false coz

Speed is a scalar quantity.

Answer:

500 Newtons

Explanation:

50 kg x 10 m/s squared

Answer:

13. (i) The magnitude of the force that is pressing the lawn-mower directly into the ground is 25 N

(ii) The magnitude of the effective force that moves the mower forward is approximately 43.3 N

(iii) Because there are no net downward force acting on the lawn-mower

Explanation:

13. The given force pushing the lawn-mower = 50 N

The angle at which the force acts = 30° to the ground

The component of the pushing force are;

(i) The magnitude of the force that is pressing the lawn-mower directly into the ground = The vertical component of the pushing force

The vertical component of the pushing force, [tex]F_y[/tex] = 50 N × sin(30°) = 25 N

∴ The magnitude of the force that is pressing the lawn-mower directly into the ground = [tex]F_y[/tex]  = 25 N

(ii) The magnitude of the effective force that moves the mower forward = The horizontal component of the pushing force

The horizontal component of the pushing force, Fₓ = 50 N × cos(30°) = 25·√3 N ≈ 43.3 N

∴ The magnitude of the effective force that moves the mower forward = 25·√3 N  ≈ 43.3 N

(iii) The lawn mower moves forward and not downwards because according to Newton's first Law of motion, the lawn-mower moves forward because it is being acted on by a net forward directed horizontal force

However, according to Newton's third law, the reaction of the ground is equal to the weight of the lawn mower, therefore, there are no net vertical force acting on the lawn-mower, such that the lawn-mower remains in the initial horizontal level and does not move downward into the ground.

Answer:

[tex]V=1.76\times 10^{-4}\ V[/tex]

Explanation:

Given that,

The diameter of a wire, d = 1.628 mm

Radius, r = 0.814  mm = 0.000814m

Current, I = 12.5 mA

The length of the wire, l = 2m

The resistivity of the wire, [tex]\rho=1.47\times 10^{-8}\ \Omega-m[/tex]

We need to find the potential difference across the wire. We know that the resistance of the wire is given by :

[tex]R=\rho\dfrac{l}{A}[/tex]

Also, V = IR

[tex]\dfrac{V}{I}=\rho\dfrac{l}{A}\\\\V=\dfrac{\rho l I}{A}\\\\V=\dfrac{1.47\times 10^{-8}\times 2\times 12.5\times 10^{-3}}{\pi \times (0.000814)^2}\\\\V=1.76\times 10^{-4}\ V[/tex]

So, the potential difference of the wire is [tex]1.76\times 10^{-4}\ V[/tex].

Answer:

electrons

Explanation:

i think this is right

Sure. That's true when ANY object is moving in a straight line at a steady speed.

Answer:

25,000,000 kg m/s

Explanation:

p: momentum (kg x m/s)

m: mass (kg)

V: velocity (m/s)

p= m * v

p= 3,000kg x 8,000 m/s

p= 25,000,000 kg m/s

Answer:

Your displacement is 15.62m NW

Explanation:

We can use the Phytagorean theorem to determine the displacement:

a^2+b^2=c^2

12^2+10^2=c^2

144+100=c^2

244=c^2

15.62=c

So your displacement is 15.62m NW

Answer:

Vector has magnitude and direction, scalar only has magnitude.

Answer:

A quantity that has magnitude but no particular direction is described as scalar. A quantity that has magnitude and acts in a particular direction is described as vector

Answer:

Let the weight of the ruler be X.

Now X acts in the middle, so we have 55-50 = 50cm

Since left hand movement= right hand movement

X(55-50)=90(95-55)

5X= 90×40

X=320cm

Hence the weight of the ruler is 320g

Explanation:

Answer:

artist

Explanation:

Answer:

30 kg·[tex]\frac{m}{s}[/tex]

Explanation:

Impulse is equal to the average force multiplied by the elapsed time, or

J=[tex]F_{av}[/tex]Δt

Your average force [tex]F_{av}[/tex] is 50 newtons because it was a constant force. Your elapsed time Δt was 0.6 seconds.

Multiply these values and you get an impulse of 30 kg·[tex]\frac{m}{s}[/tex]

Answer:

the final volume of the gas is 1.923 L.

Explanation:

Given;

initial pressure, P₁ = 8.4 atm

initial volume of the gas, V₁ = 1.9 L

final pressure of the gas, P₂ = 8.3 atm

The final volume of the gas is calculated by applying Boyle's law as follows;

P₁V₁ = P₂V₂

V₂ = P₁V₁ / P₂

V₂ = (8.4 x 1.9) / 8.3

V₂ = 1.923 L

Therefore, the final volume of the gas is 1.923 L.

Answer: Chloroplast

Explanation: Chloroplasts work to convert the Sun's light energy into sugars that cells can use. It's like a solar panel that converts energy from sunlight into electric power.

Answer:

20 meters per second.

Explanation:

200/10

Im pretty sure the answer is A)

Answer:

A

Explanation:

The correct option is (d).

Angle should be 180° between the direction of force and the direction of motion of a body as work done is equal to force multiplied by displacement multiplied by cosx.

Learn more about direction of friction force brainly.com/question/24322020

#SPJ2

Answer:

pa heart follow back follow pa brainliest narin po if my answer is correct for you THANK

Explanation:

In an experiment in which molten naphthalene is allowed to cool, the cooling cur...

Question

In an experiment in which molten naphthalene is allowed to cool, the cooling curve in fig 5 was obtained, the temperature

80

∘

is known as

Options

A) cooling temperature

B) boiling point

C) melting point √√√√√√√√√√※※※ ↑↑ANSWER

D) vaporization point

answer:

true

explanation:

Answer:

True!

Explanation:

cadmium is being used during controlled reaction which creates the energy!

I took this test! :3

Answer:

Speed affects the amount of kinetic energy an object has

Explanation:

Kinetic energy is the energy of motion therefore, it can be affected by speed

Answer:

A is the correct answer

Hope it helps

Answer:

76 seconds

Explanation:

Using the formula t=vf-vo/a, where t=time, vf= final velocity, v0= initial velocity, and a= acceleration, we can solve for your problem.

Plug in known variables...

t=200-10/a

we can solve for a by using the formula F=ma where f=force, m= mass, and a=acceleration and rearranging it to solve for a.

a=F/m

Plug in known variables...

a=250N/100kg

a=2.5m/s^2

Plug in our newly found acceleration of 2.5 m/s^2 into our first equation and solve....

t=190/2.5

t=76 seconds

Answer:

the first one is D

Explanation:

so if the others u put are right the the second would be c

Answer:

yeah sure they should have a guaranty and should be water proof

Answer:

c

Explanation:

A free body diagram doesn't show forces exerted by the object.

A free body diagram represents all the given choices except the one which is "forces exerted by the object"

Thus the above answer is right.

Learn more:

https://brainly.com/question/13191643

Answer:

Object's final momentum = 16.7 kg-m/s

Explanation:

Given that,

Impulse, J = 12.2 kg-m/s

Initial momentum, [tex]P_i=4.5\ kg-m/s[/tex]

We need to find the object's final momentum. We know that the impulse is equal to the change in momentum. So,

Impulse = change in momentum

[tex]J=P_f-P_i\\\\P_f=J+P_i\\\\P_f=12.2+4.5\\\\P_f=16.7\ kg-m/s[/tex]

So, the object's final momentum is 16.7 kg-m/s.

Given:

We know the relation,

→ [tex]Impulse = Change \ in \ momentum[/tex]

or,

→ [tex]J = P_f-P_i[/tex]

then,

→ [tex]P_f = J+P_i[/tex]

By substituting the values,

        [tex]= 12.2+4.5[/tex]

        [tex]= 16.7 \ kg-m/s[/tex]

Thus the above answer is right.      

Learn more about momentum here:

https://brainly.com/question/18551770