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
Lady_Fox [76]
3 years ago
11

What is a physical change ?

Physics
1 answer:
attashe74 [19]3 years ago
6 0
The answer is D but Ig you already knew that
You might be interested in
A tin can has a radius of 0.0410m and is 185 m high if the air is removed from inside the can how much forces will the outside a
grin007 [14]

The force exerted on the bottle is 532 N

Explanation:

When the air is removed from inside the bottle, vacuum is created, therefore the external pressure (the atmospheric pressure) is no longer balanced, and it creates a net force downward on the can.

The pressure is related to the force by the equation:

p=\frac{F}{A}

where

p is the pressure

F is the force

A is the area of the can

Here we have:

p=1.01\cdot 10^5 Pa is the atmospheric pressure

r = 0.0410 m is the radius of the can, so the area is

A=\pi r^2 = \pi (0.0410)^2=5.27\cdot 10^{-3}m^2

And solving for F, we can find the force on the can:

F=pA=(1.01\cdot 10^5)(5.27\cdot 10^{-3})=532 N

Learn more about pressure:

brainly.com/question/4868239

brainly.com/question/2438000

#LearnwithBrainly

3 0
4 years ago
If one motor has three times as much power as another, then the smaller power motor: A. can do the same work in the same time. B
Dvinal [7]

Answer:B

Explanation:

Given

First motor has three times as much as power as another

Let the power of smaller motor be P

Therefore bigger motor has power 3 P

and we know that energy E=power\times time

Larger motor E=3P\times t=3Pt

Smaller motor E=P\times 3t=3Pt

Therefore smaller motor will do same work if it takes three times the time taken by Larger motor

8 0
4 years ago
Two boxes (m1 = 43.0 kg and m2 = 39.5 kg) are connected by a light string that passes over a light, frictionless pulley. One box
wlad13 [49]
The net force on the system:
F = m₂g - m₁gsin(∅)
F = 39.5 x 9.81 - 43 x 9.81 x sin(30)
F = 176.58 N

Now, we use F = ma to find the acceleration on each mass.
F = m₁a₁
a₁ = 176.58 / 43
a₁ = 4.11 m/s²

F = m₂a₂
a₂ = 176.58 / 39.5
a₂ = 4.47 m/s²
5 0
4 years ago
A spotlight on the ground is shining on a wall 24m away. If a woman 2m tall walks from the spotlight toward the building at a sp
Lubov Fominskaja [6]

Answer:

\dfrac{dy}{dt}=-0.059\ m/s

Explanation:

It is given that,

Distance between the spotlight and the wall, y = 24 m

Height of the woman, h = 2 m

The woman walks toward the building at the rate of 0.6 m/s, \dfrac{dx}{dt}=0.6\ m/s

In the attached figure, triangle ABC and MNC are similar. So,

\dfrac{2}{y}=\dfrac{x}{24}............(1)

y=\dfrac{48}{x}

When she is 2 meters from the building. So x = 24-2 = 22 m

y=\dfrac{48}{22}=2.18\ m

Differentiating equation (1) i.e.

xy=48

x.\dfrac{dy}{dt}+y.\dfrac{dx}{dt}=0

22.\dfrac{dy}{dt}+2.18\times 0.6=0

\dfrac{dy}{dt}=-0.059\ m/s

So, her shadow is decreasing at the rate of 0.059 m/s. Hence, this is the required solution.                                

7 0
4 years ago
A car leaves a garage at 10 mph. it speeds up to 20 miles per hour in the city and eventually increases to 50 miles per hour in
LekaFEV [45]

Average speed = (total distance covered) / (time to cover the distance)

= (50 miles) / (1.5 hours)

= (50/1.5) miles/hours

= (33 and 1/3) mph .

We don't care about all that other "data" given earlier in the question.
We only need to know the total distance covered and the time it took
to cover the distance.
4 0
3 years ago
Other questions:
  • How often do spring and neap tides occur?
    10·2 answers
  • A 75 kg astronaut has become detached from their her space ship. To get back to the ship she throws a tool in the opposite direc
    7·1 answer
  • Digital thermometers often make use of thermistors, a type of resistor with resistance that varies with temperature more than st
    10·1 answer
  • I NEED THIS FILLED ASAP
    11·1 answer
  • An early model of the atom, proposed by Rutherford after his discovery of the atomic nucleus, had a positive point charge +Ze (t
    10·1 answer
  • The acceleration of a particle moving along a straight line is given by a = −kt2 m/s2 where k is a constant and time t is in sec
    8·1 answer
  • Mrs. Perez added a room temperature copper cube and an aluminum cube she just removed from the freezer to a beaker of boiling wa
    11·1 answer
  • What phases would Venus show if the geocentric model were correct?
    7·1 answer
  • Please help<br> list real-world examples of the different types of stimuli
    12·1 answer
  • I need Help ASAP I will give you brainlest and plus 5 stars ✨✨and plus thanks and 50 points EVeryONe need help this is due today
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!