Why is a car rounding a curve accelerating, even if it is moving at a constant speed?

Answers

Answer 1

Answer: Because "acceleration" does NOT mean "speeding up". It means ANY change in the speed OR direction of motion. Speeding up, slowing down, and changing direction are all 'accelerations'. If a car is not moving in a straight line, then its direction is changing and it is accelerating, even if its speed is constant.

Answer 2

Answer: Automobile speedometers give an instantaneous velocity. It is important to remember that because the velocity has a direction, a change in either the speed or the direction results in a change in velocity. This leads to an interesting fact, a car going around a curve can have a constant speed and yet still have a changing velocity. The car in the following diagram is traveling around a curve. Suppose the driver looks at his speedometer when the car is at points "A", "B", and "C". At each of these points he notices that the speedometer reads 30km/h. His speed is a constant 30km/h as he rounds the curve. Now look at what is happening to his direction of motion. As he goes around the curve, his direction changes from East to South. Because of this change in direction, we have to conclude that his velocity is changing even though his speed is constant.

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You do 25 J of work to move a 4N object 5 meters. Find your efficiency and write down the formula.

What feature will form as a result of the movement displayed in this illustration?A.
transform boundary

B.
convergent boundary

C.
mid-ocean ridge

D.
deep-sea trench

Answers

a convergent boundary is correct

B.
convergent boundary

If a hockey puck slides on a perfectly frictionless surface, it willeventually slow down because of its inertia.

Answers

If the surface is perfectly frictionless AND level ... no ups and downs ... then the puck never slows down or stops. There's nothing to make it do so. (Notice that "perfectly frictionless" means no air resistance either.)

A car with a mass of 980 kg is initially traveling east toward an intersection with a speed of vc=22.3m/s and a 1500 kg pickup is traveling north toward the same intersection. The car and truck collide at the intersection and stick together. After the collision the wreckage (car and truck) moves off in a direction of 45.0 degrees above the x-axis. Determine the initial speed of the truck (in a/s)

Answers

Answer:

14.6 m/s

Explanation:

Momentum is conserved in the north:

m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂

After the collision, they stick together, so v₁ = v₂ = v.

m₁ u₁ + m₂ u₂ = (m₁ + m₂) v₂

(980 kg) (0 m/s) + (1500 kg) u = (980 kg + 1500 kg) vᵧ

1500 u = 2480 vᵧ

Momentum is conserved in the east:

m₁ u₁ + m₂ u₂ = (m₁ + m₂) v₂

(980 kg) (22.3 m/s) + (1500 kg) (0 m/s) = (980 kg + 1500 kg) vₓ

21854 = 2480 vₓ

vₓ = 8.81 m/s

The angle of v is 45.0°, so vᵧ = vₓ.

1500 u = 2480 (8.81 m/s)

u = 14.6 m/s

How is power defined?A.the quantity of work accomplished
B.the direction of the work
C.the total distance an object is moved
D.the rate at which work is accomplished
Please Help

Answers

The correct answer to this question is D) The rate at which work is accomplished.

EXPLANATION:

Let us consider a body performs W amount of work due to the application of some external forces.

Let the body does that work during the time interval of t seconds.

Hence, the power of the body is defined as the rate of doing work or the work done per unit time. We know that energy is the capacity to do work. So, power can be defined as the rate of consumption of energy.

Mathematically power can be written as -

Power P = $(W)/(t)$ .

Hence, the correct definition of power is that the rate at which work is accomplished.

The power is the rate at which work is accomplished, option $D$ is correct.

Further Explanation:

The power is the rate of transformation energy which is used by another body.

The power is the quantity with only magnitude so it is a scalar quantity. The standard of international unit is watt, it is also written as J/s. The standard of international unit watt in honor of James Watt.

A quantity is said as a vector if it has some magnitude and direction in order to give the details regarding the quantity.

A quantity is said as a scalar if it has only the magnitude in order to give the details regarding the quantity.

Concept:

The term power is defined as “The rate at which the work is finished or the energy is transferred from one place to another or transformed into another form.”

The term energy is defined as the capacity to do work or result in some displacement by applying some force.

The expression for power is:

$\fbox{\begin\np =\frac{{\Delta w}}{{\Delta t}}\end{minispace}}$

Here, $p$ is the power, $\Delta w$ is the change in energy and $\Delta t$ is the change in the time.

Therefore, the power is the rate at which work is accomplished, option $D$ is correct.

Learn more:

1. Work and power brainly.com/question/9566221

2. Calculate power brainly.com/question/2829572

3. Energy and SI unit https://brainly.in/question/1227001

Answer Details:

Grade: Middle school

Subject: Physics

Chapter: Kinematics

Keywords:

Define, power, quantity, work, accomplished, direction, total distance, object, moved, rate, option, D.

a truck with a mass of 1150 kg and a velocity of 13 m/s collided into a parked car with a mass velocity does the car move forward after the collision

Answers

Answer:

Yes

Explanation:

The truck has momentum since it is moving and momentum is a product of mass and velocity. After impact, part of momentum that the truck had is transferred to the car hence the car initially at rest moves a significant diatance. Here, we utilize the formula MV= (m+M)v where M and V represent mass and velocity of the truck while m is the mass of car, v is the common velocity. Note that some letters are capital while others small, don't confuse these.

Identify three devices that use Convex lenses. Please help.
(and no it doesn't give any options, it can be any device you can think of that uses a Convex lense)

Answers

Answer:

Explanation:

Convex lens is the lens which is used to converge the rays of light after refraction.

When the rays of light are coming parallel to the principal axis then after refraction they goes from the focus.

It is used as rear view mirror in automobiles. In this case it pelroduces small and erect image of faroff objects.

It is used in spectacles using for hypermetropia.

It is used in microscopes and telescopes.

Our eye also have a convex lens which forms images on retina.

Microscope lenses , glasses for people who can't see faraway as well and microwave lenses which reflect electromagnetic radiation. Oh and curved mirrors.

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