It takes 167 kJ of work to accelerate a car from 20.9 m/s to 27.9 m/s. What is the car's mass?

Answers

Answer 1

Answer:

Answer:

space without opposite should be served

Related Questions

An electroscope is a device that detects charge on objects that touch it or are brought near it. John rubs a piece of cotton fabric on a plastic rod and then touches the rod to the electroscope.What methods of charging does John use?
5) A speeding car sees a deer and slams on his breaks. He changes his speed from 30 m/s to zero with anacceleration of-3 m/s/s. How long does it take the car to stop?
Which of the following universal forces is the weakest? A) electricB) gravitationalC) magneticD) strong nuclearI also need some explanation for this one
How many nitrogen atoms are in one molecule of (NH4)2SO4?
A golf ball is dropped from rest from a height of 9.5m. It hits the pavement then bounces back up rising just 5.7 m before falling back down again. A boy then catches the ball on the way down when it is 1.20 m above the pavement. Ignoring air resistance, calculate the total amount of time the ball is in the air, from drop to catch.

At what speed v will the length of a 1.00 m stick look 13.7 % shorter (86.3 cm )Using formula L=Lp sqrt 1-v^2/c^2

Answers

L= Lp - 13.7*Lp/100 = Lp-0,137Lp = 0,8613Lp

⇒L/Lp = 0.8613

From the formula above L/Lp = √(1-v^2/c^2)

(L/Lp)^2 = 1 - (v^2/c^2)

v^2/c^2 = 1 - (L/Lp)^2

v/c = √[1 - (L/Lp)^2]

v = c √[1-(L/Lp)^2]

v =c√[1-0.8613^2] = 0.508c

In the vacumm speed of light, c, is approx 300,000,000 m/s

v =0.508 (300,000,000m/s) =152,400,000 m/s

Please, let me know if this helped you.

Which statement BEST describes why warm ocean currents are usually surface currents? A) Warm water is less dense than cold water.
B) Ocean tides bring warm water to the surface.
C) Warm water contains more salt than cold water.
D) Ocean water loses heat to the air at the surface.

Answers

I think it is B because it seems like the most valid choice.

Answer:

The answer is A because the less dense the water is the more closer to the surface it will be and when heated by the sun, it increases the temperature of surface currents.

Explanation:

I took the test, hope this helped!

The copper wire and bulb is connected in a series with 220 V electric supply. Why only an electric bulb glows where as the copper wire remains the same.Give REASON to support the answer.

Answers

-- In a series circuit, the current ( I ) is the same at every point.

-- The power dissipated by any section of the circuit is I² x Resistance.

-- The wire has very low resistance, so I²R is very low dissipated power.

-- The filament in the bulb has most all of the resistance in the circuit,
so it dissipates virtually all the power of the circuit, and certainly much
more than the wires do.

In order for an object to accelerate, a forcegravityfrictiona swing must be applied.

Answers

In order foran object to accelerate, a force must be applied. It follows Newton’s secondlaw of motion where it states that a body at rest remains at rest unless aforce is acted upon it. When you move an object, you are exerting a force ontoit. By exerting a force on the object, you are actually displacing it from itsinitial position. You cannot apply force to the object without altering itsposition. Keep in mind that when you exert work, you are exerting energy too.

Please help me! In a collision, Kara Less who was traveling at 11 m/s while texting in her 1300 kg car, is struck by another vehicle and finds herself and her phone suddenly moving 2.5 m/s in the opposite direction. What impulse does she experience? SHOW WORKAnswer Choices

A. -12,000
B. -14,000
C. -16,000
D. -18,000

Answers

Answer:

D. -18,000

Explanation:

Let's define impulse :

Impulse is defined as the product of Force ( N ) applied on the body and the time of impact ( s ) or
The change in momentum

hence in this question ,

kara is initially moving with the :

velocity $v_(i)$ = 11 $ms^(-1)$

finally moving with velocity $v_(f)$ = -2.5 $ms^(-1)$ (minus as she moves in the opposite direction )

therefore the initial momentum $p_(i)$ = $m*v_(i) = 1300*11 = 14300 kgms^(-1)$

and the final momentum $p_(f)$ = $m*v_(f) = 1300*-2.5= 3250 kgms^(-1)$

thus the change in momentum : $p_(f)$ - $p_(i)$

= -3250-14300 = -17550 $kgms^(-1)$ ≅ -18000 $kgms^(-1)$

What is the main function of a telescope?It brings scientists closer to distant objects.

It magnifies light received from distant objects.

It measures the temperature of distant objects.

It measures the wavelengths of incoming light rays

Answers

Explanation :

Telescope is an instrument which is used to magnify distant objects bright, consistent and large.

The function of an ideal telescope must be :

Magnification
Resolution
Power of gathering of light

There are many types of Telescope like:

X ray telescope
Optical telescope
Ultraviolet telescope etc

Hence, the correct option is (b) " It magnifies light received from distant objects ".

It magnifies light received from distant objects.

Other Questions

Difference between impulse and impulsive force

(PLEASE HELP) Identify the following as electromagnetic (E) or mechanical (M) waves.sound waves water waves radio waves ultraviolet waves waves in a wheat field

Question 55. What subatomic particle has no electrical charge? •neutron •proton •electron •atom

When a covalent or an ionic bond is formed a chemical change has occurred. Which of these is not associated with a chemical change?A) The atoms of the substance produced have been rearranged. B) The substances produced are identical to the substances that reacted except that they're isomers.C) The total mass of the reacting substances is the same as the total mass of the substance produced by the reaction. D) The chemical properties of the substances produced by the reaction are different from those of the reacting substances.