HELP!
A position-time graph is shown below: (2 points)

Which statement accurately describes the speed of the object in the graph above over the four seconds?
O
Speed is increasing
Speed is constant.
Speed is decreasing.
Object is at rest.

Answer:

F = 12 N

Explanation:

Mechanical Work

Mechanical work is the amount of energy transferred by a force. It's a scalar quantity, with SI units of joules.

Being F the force vector and s the displacement vector, the work is calculated as:

W = F.s

If both the force and displacement are parallel, then we can use the equivalent scalar formula:

W=F.s

When the value of the work is known and we need to find the force, we solve the above equation for F:

[tex]\displaystyle F=\frac{W}{s}[/tex]

The wrapping present is moved by s=9 m doing W=108 J of work. The force used is:

[tex]\displaystyle F=\frac{108}{9}[/tex]

F = 12 N

Answer:

500

Equation used:

(1/2 * 250kg) * 2 m/s^2

Hope i'm right

Answer:

D.) A 15 kg mass moving at 2.0 m/s

Explanation:

The inertia of an object is most directly related to its mass and not the magnitude of the velocity.

So, the higher the mass of an object, the more its inertia.

According to Newton's first law of motion "an object will remain in its state of rest or of constant motion unless it is acted upon by an external force".

Answer: The answer is B: Convection  

Explanation: Convection transfers heat through a movement of fluids but in this case its through air hope this helps :)

Answer:

B. [tex]F = -k*x[/tex]

Explanation:

The force of a spring can be easily calculated using Hooke's law which tells us that the force applied on a spring is equal to the product of the constant of a spring by the compressed or stretched distance of the spring.

That is:

[tex]F = k*x[/tex]

k = spring constant [N/m]

x = distance [m]

Answer:

Em are waves that are created as a result of vibrations between an electric field and a magnetic field.

Explanation:

Answer:

Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are composed of oscillating magnetic and electric fields.

A changing magnetic field will induce a changing electric field and vice-versa the two are linked. These changing fields form electromagnetic waves.This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

Fun fact - The first oranges weren’t orange

The original oranges from Southeast Asia were a tangerine-pomelo hybrid, and they were actually green. In fact, oranges in warmer regions like Vietnam and Thailand still stay green through maturity.

Answer:

c. Y

Explanation:

Newton's third law of motion states that action and reaction are equal and opposite. Hence for every action, there is an equal and opposite reaction.

Considering the system of forces shown in the image, W and Y are  opposite forces. When the driver slams on the brakes, he will be pushed forward towards the windscreen. The force Y exerted by the seat belt keeps him on the drivers seat by moving him backwards towards the seat.

Answer:

140m

70sec I cant show my work but I gave you a push

Explanation:

Brainliest?

Answer:

(R=6. 4×106m)

Explanation:

The height above the surface of earth at which acceleration due to gravity is half the acceleration due to gravity at surface of earth

Explanation:

acceleration due to gravity at surface of earth is (R=6. 4×106m)

hope this answer helps you

Clara gave agreeable reason of  swinging back and forth of the boy on the tire.

According to the definition of centripetal force, this force is applied to an object moving curvilinearly and is targeted at the axis of rotation or the center of curvature. Newtons are used to measure centripetal force.

Since she is being affected by more than two forces at the bottom of the swing, There is also the centripetal force, which acts in the direction of the circle's center because she is rotating in a circle. In order to achieve zero net force, the tension must actually be smaller than the weight because the centripetal force and tension both point upward while the weight points downward. The weight is equal to the tension plus the centripetal force.

Hence, Clara gave agreeable reason.

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Answer:

[tex]\eta_{turbine} = 0.777 = 77.7\%[/tex]

[tex]\eta_{combined} = 0.728 = 72.8\%[/tex]

Explanation:

First we calculate the power input to the turbine. The input power will be equal to the potential energy of water per unit time:

Input Power = [tex]P_{in} = \frac{Work}{Time} = \frac{Potential\ Energy\ of\ Water}{t} \\P_{in} = \frac{(mass)(g)(height)}{Time} = (mass flow rate)(g)(height)\\\\P_{in} = (1500\ kg/s)(9.81\ m/s^2)(70\ m)\\P_{in} = 1.03\ x\ 10^6\ W = 1030\ KW[/tex]

Now, for turbine efficiency:

[tex]\eta_{turbine} = \frac{Mechanical\ Power\ Out}{P_{in}}\\\\\eta_{turbine} = \frac{800\ KW}{1030\ KW}\\\\\eta_{turbine} = 0.777 = 77.7\%[/tex]

for generator efficiency:

[tex]\eta_{generator} = \frac{Power\ Generation}{Mechanical\ Power\ Out}\\\\ \eta_{generator} = \frac{750\ KW}{800\ KW}\\\\\eta_{turbine} = 0.9375 = 93.75\%[/tex]

Now, for combined efficiency:

[tex]\eta_{combined} = \eta_{turbine}\ \eta_{generator}\\\\\eta_{combined} = (0.777)(0.937)\\\eta_{combined} = 0.728 = 72.8\%[/tex]

Answer:

Mn(NO₃)₃

Explanation:

Manganese Nitrate solutions are categorized from moderate to high concentrated liquid solutions of Manganese nitrate.

This formula unit has Mn³⁺ cation and NO₃⁻ anions

Manganese nitrate comes before manganese carbonate that is used as a colorant and in making of fertilizers.

Answer:

B

Explanation:

that is the most common due to the fact that you can observe what you want before you make a purchase

Answer:

Explanation:

b

Answer:

Mass and Gravity

Explanation:

Objects with mass exert forces on each other via the force of gravity. This force is proportional to the mass of the two interacting objects and is inversely proportional to the square of the distance between them.

Answer: The air pressure would build up resulting in a high air density.

Explanation: Heat energy builds up air pressure. And if you surround it with bubble wrap, that air pressure will have nowhere to release to. And so because of that, high air density occurs.

Answer:

24 m/s

Explanation:

Given that the height of the ball from the elevator, h=20 m

The acceleration due to gravity, g=10 m/[tex]s^2[/tex]

The initial velocity of the ball is zero, so, by using the equation of the motion [tex]v^2=u^2+2as[/tex] the velocity of the ball, v, when reached the elevator,

[tex]v^2=0+2\times 10 \times 20 \times h[/tex]

[tex]v=\sqrt{400}=20[/tex] m/s

The velocity of the ball just before the collision is 20 m/s in the downward direction.

The velocity of the lift just before the collision is 2 m/s in the upward direction.

As the ball and the lift moves in the opposite direction, so the speed of approach [tex]= 20+2=22[/tex] m/s.

Assuming that there is negligible change in the speed of the lift, so the velocity of the lift after the collision is 2 m/s

Let the velocity of the ball after the collision is [tex]V_2[/tex] m/s in the direction of the velocity of the lift.

So, the speed of the separation [tex]=V_2 -2[/tex]

As the collision is elastic, so the coefficient of restitution, [tex]\mu=1[/tex]

[tex]\mu = \frac {\text{Speed of seperation}}{\text{speed of approach}}[/tex]

[tex]\Rightarrow 1=\frac{V_2-2}{22} \\\\\Rightarrow V_2-2=22 \\\\\Rightarrow V_2=22+2 \\\\[/tex]

[tex]\Rightarrow V_2=24[/tex] m/s

Hence, the ball rebounds with a velocity of 24 m/s.

Answer:

(a) Let the height of the platform is h meter,

=>By s = ut + 1/2gt^2

=>h = 0 + 1/2 x 9.8 x (2.3)^2

=>h = 25.92 m

(b) By R = [Ux] x t

=>R = 2.47 x 2.3

=>R = 5.68 m

Explanation:

Explanation:

From the exercise we know the initial horizontal velocity and the time that Janet takes to land in the water

a) Knowing the formula for free falling objects, we can calculate how high is the platform

At t=2.3m the position of Janet is y=0m

So, the platform is 26m tall

b) According to dynamics the displacement of an object can be analyze using the following formula:

So, Janet lands 6 m far from the base of the platform

B        BRIANLIEST PLS

Explanation:

Answer:

geothermal energy is the answer

Answer:

The value is [tex]R_{max} = 33.54 \ m[/tex]

Explanation:

From the question we are told that

    The total time of flight is  [tex]t = 3.7 \ s[/tex]

Generally from kinematic equation

        [tex]v = u - g * \frac{t}{2}[/tex]

So v is the velocity at maximum height and the value is  v = 0 m/s

So

       [tex]0 = u - 9.8 * \frac{ 3.7}{2}[/tex]

=>   [tex]u = 18.13 \ m/s[/tex]

Here u  is the initial velocity of the dart as it leaves that gun  

Gnerally the horizontal range of the dart is mathematically represented as

         [tex]R = \frac{u ^2 sin 2\theta }{g}[/tex]

For maximum horizontal range the value of  [tex]\theta = 45^o[/tex]        

So

         [tex]R_{max} = \frac{ 18.13 ^2 sin 2(45) }{9.8}[/tex]

=>     [tex]R_{max} = 33.54 \ m[/tex]

Answer:it would make it thicker

Explanation:

Answer:

"The equation shows that the current in a circuit is inversely proportional to the resistance of the circuit. An increase in resistance would result in a decrease in current. And the factor by which the resistance increases is the same factor by which the current decreases."

Explanation:

Because it's just like wearing a glove/mitten when getting something out of the oven, because of the insulation from the glove/mitten, it reduces the heat that gets through into your hand, and it protects it. Just like what the "answer" says, it said that the resistance would decrease current.

Answer:

A. i think

Explanation:

Answer:

the answer would be B

Explanation:

swelling is the result of the increased movement of fluid and white blood cells into the injured area.

Answer:A

Explanation:I’m taking the test rn and I got it correct

It is a conductor that allows charge to move freely through it.

Resistivity is a distinctive attribute of any material that may be used to compare different materials based on how well they conduct electric currents. Low conductivity is indicated by high resistance.

The Greek letter rho is frequently used to represent resistance, which is numerically equivalent to the resistance R of a wire-like specimen, multiplied by its cross-sectional area A, and divided by its length.

The ohm is the measurement of resistance. The ratio of area in square meters to length in meters is reduced to merely meters in the metre-kilogram-second (mks) method.

Therefore, It is a conductor that allows charge to move freely through it.

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