1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Valentin [98]
3 years ago
12

A 15 kg mass is moving at 7.50 meters per second on a horizontal, frictionless surface. What is the total work that must be done

on the mass to increase it's speed to 11.5 meters per second?
Physics
1 answer:
sashaice [31]3 years ago
8 0
Kinetic energy = (1/2) (mass) x (speed)²

At 7.5 m/s, the object's KE is (1/2) (7.5) (7.5)² = 210.9375 joules

At 11.5 m/s, the object's KE is (1/2) (7.5) (11.5)² = 495.9375 joules

The additional energy needed to speed the object up from 7.5 m/s
to 11.5 m/s is (495.9375 - 210.9375) = <em>285 joules</em>.

That energy has to come from somewhere. Without friction, that's exactly
the amount of work that must be done to the object in order to raise its
speed by that much.
You might be interested in
Which system works with the respiratory system for the exchange of gases to take place?
zvonat [6]

Answer:

Circulatory System

Explanation:

The respiratory system works with the circulatory system to provide tis oxygen and to remove the waste products of metabolism. It also helps to regulate PH of the blood. Respiration is the sequence of events that result in the exchange of oxygen and carbon dioxide between the atmosphere and the body cells.

7 0
3 years ago
A 50 kg bicyclist, traveling at a speed of 12 m/s, applies the brakes, slowing her speed to 3 m/s.
Bezzdna [24]

a) Work done = Net Kinetic Energy

= 1/2 x 50 kg x ((12m/s)^2 - (3m/s)^2)

= 0.5 x 50 Kg x (144 -9)(m/s)^2

= 3375 Kg (m/s)^2

b) Force = mxa

a = 120 N/50 Kg = 2.4 m/s^2

Using newtons third law of motion, we get-

V^2 - U^2 = 2 x a x S

S= (12^2-3^2)m^2/s^2/(2 x 2.4 m/s^2)

= 28.125 m


3 0
3 years ago
An environmentally-conscious student is breaking the rings from a six-pack drink holder before disposing of it. This reduces the
katrin2010 [14]

Answer: seen below.

Explanation:

Firstly we need to remember what exothermic reaction is in thermodynamics. exothermic reaction describes a process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light, sound, or electricity.

In this scenario, due to the heating up nature noticed by the ring during breaking shows that energy is being released to the surrounding in the form of heat which suggest it being an exothermic reaction.

8 0
3 years ago
A planet outside of our solar system
Zolol [24]

Answer:

exoplanets is any planet beyond our solar system.

4 0
3 years ago
A sheet of glass is coated with a 500-nm-thick layer of oil (n = 1.42).
tamaranim1 [39]

Answer:

a) <em>473.33 nm </em>

<em>b) 568 nm</em><em> and </em><em>406 nm</em>

<em>c) </em>bluish green and blue

Explanation:

a) As the light traverses the layer of oil it first reflects at the front surface of the oil. Here the index of refraction increases from that of air to that of the oil , so a phase change occurs.  The light then reflects from the rear surface of oil. The index of refraction increases from that of the oil to that of the glass , so again a phase change occurs.  Thus two phase changes occur.

In thin-film interference with 0 or 2 phase changes, condition for constructive interference is:

2t=mλ/n

So:

λ= 2tn/m

<em><u>For m=1</u></em>

λ=1420 nm

<em><u>For m=2</u></em>

λ=710 nm

<em><u>For m=3</u></em>

λ=473.33 nm

<em><u>For m=4</u></em>

λ=355 nm

<em>Thus the only wavelength in the visible spectrum </em><em>(400 - 700 nm)</em><em> that will give constructive interference is </em><em>473.33 nm </em>

b)

In thin-film interference with 0 or 2 phase changes, condition for destructive interference is:

2t=(m+1/2)λ/n=(2m+1)*λ/2n

so;

λ=4tn/(2m+1)

<em><u>For m=1</u></em>

λ=946.667 nm

<em><u>For m=2</u></em>

λ=568 nm

<em><u>For m=3</u></em>

λ=405.33 nm

<em><u>For m=4</u></em>

λ=315.56 nm

<em>Thus the wavelengths in the visible spectrum (</em><em>400 to 700 nm)</em><em> that will give destructive interference are </em><em>568 nm</em><em> and </em><em>406 nm</em>

<em>c) </em>The color of reflected light is bluish green  since the wavelength is 473.3 nm .  We know that the colors of reflected and transmitted light are complimentary to each  other.Thus the color of transmitted light  is blue (due  to the  combination of wavelengths 568 nm (green) and 406 nm (deep violet).

<em />

5 0
3 years ago
Other questions:
  • Can someone give me the units
    8·1 answer
  • Which of the following is best described as a synthesis reaction? (2 points) 2HgO → 2Hg + O2 AgNO3 + NaCl → AgCl + NaNO3 HCl + N
    13·2 answers
  • Do i become a professional astrophysicist after getting PhD in Astrophysics ? Or will i be a postdoc research student i mean wil
    14·1 answer
  • A car traveling 90km/hr is 100 m behind a truck traveling 50km/hr. How long will it take the car to reach the truck?
    15·2 answers
  • What is a main component of steel
    13·1 answer
  • How do earths movements affect our view of the star
    15·2 answers
  • I don't hang out with girls so if you are a boy and you want to be friend say hi to me
    7·2 answers
  • A liquid with a density of 900kg/m 3 is stored in a pressurized, closed storage tank. The tank is cylindrical with a 10m diamete
    11·1 answer
  • You throw a ball vertically upward, and as it leaves your hand, its speed is 10.0 m/s.
    10·1 answer
  • Two spheres A and B are projected off the edge of a 1.0 m high table with the same horizontal velocity . sphere A has a mass of
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!