A car of mass 1700kg moves in a straight line along a slope that is at an angle θ to the
horizontal, as shown in Fig. 3.1.
The car moves at constant velocity for a distance of 25m from point A to point B.
Air resistance and friction provide a total resistive force of 440N that opposes the motion of the car.
For the movement of the car from A to B:
(i) state the change in the kinetic energy.
[How do you find the change in kinetic energy?..]

Answer:

2.5m/s^2

Explanation:

a=velocity/time

a=25m/s/10s

a=2.5m/s^2

Answer:The object will begin to move

Explanation:

Answer:

The cyclist is traveling at 130 m/s

Explanation:

Constant Acceleration Motion

It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.

Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:

[tex]v_f=v_o+at[/tex]

The cyclist initially travels at 10 /s and it's accelerating at a=6m/s^2. We need to know the new speed when t= 20 seconds have passed.

Apply the above equation:

[tex]v_f=10+6\cdot 20[/tex]

[tex]v_f=10+120[/tex]

[tex]v_f=130\ m/s[/tex]

The cyclist is traveling at 130 m/s

Answer:

23 N

Explanation:

Answer:

If you don't know then skip it. XD

Explanation:

Answer:

They conduct thermal energy from inside the house and release it outside the house. ... It reduces the amount of thermal energy that is transferred from outside to inside the container

Answer:

They conduct thermal energy from inside the house and release it outside the house

Answer:

decomposers break down waste to yield ammonia.

Explanation:

The nitrogen cycle is the process by which nitrogen circulates among the atmosphere, terrestrial, and marine ecosystems and is converted into multiple chemical forms through both biological and physical processes.

In the nitrogen cycle, decomposers do not break down waste to yield ammonia.

So, the option ''decomposers break down waste to yield ammonia'' is correct.

Explanation:

The given table gives the acceleration of an object for the different items at 50 N force.

Force acting on an object is given by :

[tex]F=ma[/tex]

As, [tex]a=\dfrac{v-u}{t}[/tex]

where u and v are initial and final velocities

It can be noticed that, as the mass of the object increases and final velocity decreases, the value of acceleration also decreases. It is maximum when the mass is least and the final velocity is most. As mass and velocity is changing, it will cause the change in variations of the value of a.

Variation in the values of acceleration occurs due to the different in the final velocity of different items.

The acceleration values obtained by the different items varies from one another because of different mass as well as final velocity. Acceleration depends on both mass of an object as well as velocity. We know that acceleration is the time rate of change of velocity.

So if the change occur in velocity we also experience change in the acceleration of that object so we can conclude that variation in the values of acceleration occurs due to the different in the final velocity of different items.

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Answer:

3) Be durable

Explanation:

It says that ¨ They found the material polycarbonate, which is long-lasting and not too costly.

Answer:

A: It allows scientists to challenge inaccurate information.

Explanation:

Answer:

Acceleration = 6 m/s²

Explanation:

Given:

Initial velocity u = 0 m/s

Final velocity v = 30 m/s

Time taken t = 5 second

Find:

Acceleration

Computation:

v = u + at

30 = 0 + (a)(5)

30 = 5a

Acceleration = 30 / 5

Acceleration = 6 m/s²

Answer:

B. The field is moving

Answer:

0.161

Explanation:

N = mg

= 8.2(9.81)

= 80.442 N

Answer:

(A) The acceleration of Melissa is 0.211 m/s²

(B) The net force on Melissa is 9.5 N

Explanation:

Given;

radius of the carousel, r = 8.0 m

speed of Melissa, v = 1.3 m/s

mass of Melissa, m = 45 kg

(A) The acceleration of Melissa is given by centripetal acceleration;

[tex]a_c = \frac{v^2}{r} \\\\a_c = \frac{1.3^2}{8}\\\\a_c = 0.211 \ m/s^2[/tex]

(B) The net Force on Melissa is given by centripetal force;

[tex]F_c = ma_c\\\\F_c = 45 *0.211\\\\F_c = 9.5 \ N[/tex]

Answer:

2.89 m/s²

Explanation:

From the question given above, the following data were obtained:

Radius (r) = 100 m

Velocity (v) = 17 m/s

Acceleration (a) =.?

The acceleration of a circular motion is defined by:

a = v²/r

Where:

a is the acceleration.

v is the velocity.

r is the radius.

With the above formula, we can obtain the acceleration of the car as follow:

Radius (r) = 100 m

Velocity (v) = 17 m/s

Acceleration (a) =.?

a = v²/r

a = 17²/ 100

a = 289/100

a = 2.89 m/s²

Therefore, the acceleration of the car is 2.89 m/s²

Explanation:

The emf is equal to the work done on the charge per unit charge (ϵ=dWdq) when there is no current flowing. Since the unit for work is the joule and the unit for charge is the coulomb, the unit for emf is the volt (1V=1J/C).

Answer:

The EMF or electromotive force is the energy supplied by a battery or a cell per coulomb (Q) of charge passing through it. The magnitude of emf is equal to V (potential difference) across the cell terminals when there is no current flowing through the circuit. (byjus)

Explanation:

The distance traveled by car with a constant speed of 20m/s is equal to 240m.

The speed of an object can be defined as the distance traveled by the object in a definite time interval. The speed is a scalar quantity as it carries only the magnitude and does not have any direction.

The speed can be calculated from the ratio of the distance traveled by the object to the time taken to cover that distance.

The speed equation for an object can be written as follows:

Speed = distance /time taken

Distance = Speed × time

Given, the speed of the car = 20 m/s

The total time taken by car to travel the distance = 12 sec

The distance traveled by car = 20 × 12 = 240 m.

Therefore, the car will travel a distance of 240 meters in a given time.

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Answer:

B can take 0.64 sec for the longest nap .

Explanation:

Given that,

Total distance = 350 m

Acceleration of A = 1.6 m/s²

Distance = 30 m

Acceleration of B = 2.0 m/s²

We need to calculate the time for A

Using equation of motion

[tex]s=ut+\dfrac{1}{2}at_{A}^2[/tex]

Put the value in the equation

[tex]30=0+\dfrac{1}{2}\times1.6\times t_{A}^2[/tex]

[tex]t_{A}=\sqrt{\dfrac{30\times2}{1.6}}[/tex]

[tex]t_{A}=6.12\ sec[/tex]

We need to calculate the time for B

Using equation of motion

[tex]s=ut+\dfrac{1}{2}at_{B}^2[/tex]

Put the value in the equation

[tex]30=0+\dfrac{1}{2}\times2.0\times t_{B}^2[/tex]

[tex]t_{B}=\sqrt{\dfrac{30\times2}{2.0}}[/tex]

[tex]t_{B}=5.48\ sec[/tex]

We need to calculate the time for longest nap

Using formula for difference of time

[tex]t'=t_{A}-t_{B}[/tex]

[tex]t'=6.12-5.48[/tex]

[tex]t'=0.64\ s[/tex]

Hence, B can take 0.64 sec for the longest nap .

Answer:

Scientists are developing techniques to detect signatures from space in their search for alien life.

The Very Large Array (VLA) telescope, at the National Radio Astronomy Observatory (NARO) site in Socorro, New Mexico, will be used to constantly seek evidence of technosignatures.

Hope this helps

Answer:

you change the direction of the magnetic field.

Explanation:

Because the magnetic field created by the electric current in the wire is changing directions around the wire, it will repel both poles of the magnet by bending away from the wire.

Lungs do not help in the perception and production of sound in humans.

Gaseous exchange occurs during inhalation and exhale during breathing. Main components of the human respiratory system include the nose, mouth, throat, larynx, trachea, bronchi, and lungs.

In humans and other vertebrates, the primary organs for respiration are the lungs. They are situated in the thoracic cavity of the chest, on either side of the heart. The lungs are spongy, anatomically speaking, with a total surface area that ranges from 50 to 75 square meters.

The lungs' main job is to make it easier for gases to move from the blood into the air. It's interesting to note that the right lung is significantly larger and heavier than the left.

Hence, lungs do not help in the perception and production of sound in humans.

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Answer:B

Explanation:

Being familiar with the different types of galaxies that exist in the universe is the action which might lead the scientists to develop new explanations about the universe. Thus, the correct option is D.

Many religious person, including many great scientists, hold that the God has created the universe and the various processes which are the driving physical and biological evolution and that these processes then resulted in the creation of the different galaxies, the solar system, and life on the planet Earth.

The Big Bang theory states that the universe came into being from a single, unimaginably hot and dense point more than about 13 billion years ago. This did not occur in an already existing space. Rather, it initiated from the expansion and cooling of space itself.

Therefore, the correct option is D.

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