Physics principles involved in the tablecloth trick???

Answers

Answer 1

Answer: Inertia: the plates over the tablecloth will try to stay in the same state of non movement. If there is minimum friction between the tablecloth and the objects standing on it, a rapid movement of the tablecloth does not change the state of the objects.

Answer 2

Answer:

inertia is the answer haha i'm late

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Choose most accurate statement:a. Waves can exist in liquids and gases only.
b. Waves can exist in liquids and solids only.
c. Waves can exist in solids and liquids only.
d. Waves can exist in solids, liquids, and gases.

Answers

"Waves can exist in solids, liquids, and gases."
is the ONLY accurate statement.

The word "only" in the other 3 statements makes them
not accurate at all.

You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.15 m. Determine the frequency, period, and speed of these water waves.

Answers

Frequency = rate of sploosh = 2 per second = 2 Hz.

Period = ( 1/frequency ) = 1/2 second

Speed = (wavelength) x (frequency) = (0.15m) x ( 2/sec) = 0.075 m/s .

A piston exerts a force of 2,500 newtons on liquid in a cylindrical container. If the pressure on the top of the liquid is 12.5 kilopascals, find the area of the surface of the liquid, in square meters. ? please help

Answers

Here are the choices.

A. 200 m
B. 31.25 m
C. 0.2 m
D. 5 m

Pa = N/m²
m² = N/Pa

12.5 kPa = 12500 Pa

m² = N/Pa
m² = 2500 / 12500
m² = 0.2

C. 0.2 m²

So the correct answer is 0.2m^2

A squirrel sitting on the ground starts to run with an acceleration of 5.1 m/s 2. How fast is the squirrel going after 0.25 seconds?A. 20.4 m/s
B. 1.28 m/s
C. 0.49 m/s
D. 3.1 m/s

Answers

initial speed = 0
final speed = v
acceleration = 5.1
time taken = 0.25
v=u+at
v=1.28 m /s

Suppose that you're facing a straight current-carrying conductor, and the current is flowing toward you.The lines of magnetic force at any point in the magnetic field will act in
A. the same direction as the current.
B. a clockwise direction.
C. a counterclockwise direction.
D. the direction opposite to the current.

Answers

Right-hand rule reveals a connection between the current and the magnetic field lines in the magnetic field. It is also called Ampere`s right hand screw rule. It determines the direction of the magnetic field surrounding a current carrying wire. The thunb points direction of current and fingers point the direction of magnetic lines of force. Answer: C ) a counterclockwise rotation.

Answer: b. a clockwise direction

Explanation: just took the test

Solve for r

F= k (m1m2/r^2)

Answers

$F= k ( m _(1)m _(2))/(r^2) \n \n r\neq 0\n \n r^2F =k\cdot m _(1)m _(2) / :F \n \nr^2= (k\cdot m _(1)m _(2) )/(F)\n \nr = \sqrt{(k\cdot m _(1)m _(2) )/(F)}$

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