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enyata [817]
3 years ago
5

The famous scientist Galileo Galilei did several experiments with sloping planes, which he rolled metal balls down so that he co

uld study motion. By changing the slope, he could study how the speed at which the ball rolled was affected.
What was one thing Galileo would have needed to control himself to make sure his experiment gave him useful information?

A. the speed of the ball
B. the slope of the plane
C. the pull of Earth's gravity
D. the material the ball was made of
Physics
1 answer:
KatRina [158]3 years ago
5 0
Hi there!

The answer would be B. the slope of the plane.

Changing the slope of the plane would show how fast the ball went when Galileo changed the steepness of the slope. If he didn’t change the slopes steepness he would have the same results each time.

Hope this helps !
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A tire measures 20 inches in diameter. How many revolutions will the tire have completed when it has traveled 100 yards? Express
Soloha48 [4]
<h2>Number of revolutions required to travel 100 yards is 57.</h2>

Explanation:

Diameter of tire,D = 20 inches

Perimeter of tire = πD

Perimeter of tire = π x 20 = 62.8 inches

Distance traveled = 100 yards

1 yard = 36 inches

Distance traveled = 100 x 36 = 3600 inches

In one revolution it travels 62.8 inches.

\texttt{No of revolutions = }\frac{3600}{62.8}\\\\\texttt{No of revolutions = }57.32\\\\\texttt{No of revolutions = }57

Number of revolutions required to travel 100 yards is 57.

8 0
3 years ago
An rv is traveling 60 km/h along a highway at night. a boy sitting near the driver of the rv turns a flashlight on and shines it
nika2105 [10]

Speed of light relative to the boys = 300,000,000 m/s

Speed of light relative to a stationary observer on the side of the road =

<h3>300,000,000 m/s</h3><h3>What is special theory of relativity?</h3>
  • The theory of special relativity explains how speed affects space, time, and mass.
  • Small amounts of mass (m) can be interchangeable with large amounts of energy (E), as defined by the classic equation E = mc2, according to the theory, which offers a means for the speed of light to define the link between energy and matter.

<h3>What are the special relativity's guiding principles?</h3>
  • The laws of physics should be independent of the uniform motion of an inertial frame of reference, and the speed of light should be constant in any such frame, according to two fundamental tenets that constitute the basis of the special theory of relativity.

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3 0
2 years ago
Two point charges lie on the x axis. A charge of 6.3 μC is at the origin, and a charge of -9.5 μC is at x=10.0cm. Express your a
Luden [163]

Answer: a) 31.07 * 10^6 N/C ; b) 11.68 * 10^6 N/C

Explanation: in order to solve this problem we have to use the Coulomb force which is given by:

F=k*q1*q2/r^2

( see attach for details)

7 0
4 years ago
A flat, horizontal uniform plank is supported underneath by a triangular wedge which itself rests on flat, level ground. An obje
ser-zykov [4K]

Answer:C

Explanation:

Given

weight of object is equal to weight of object

Suppose weight of Planck is W

suppose weight is at distance of x cm from wedge

balancing Torque

w\times x-w(\frac{L}{2}-x)=0

2x=\frac{L}{2}

x=\frac{L}{4}

i.e. at a distance of 0.25L from the Left end  

7 0
3 years ago
Read 2 more answers
An inductor is connected to an AC generator. As the generator's frequency is increased, the current in the inductor A. Increases
Luda [366]

Answer:

B) Decrease

Explanation:

Resistance offered due to inductor in any AC circuit is given as

X_L = \omega L

here we know that

\omega = angular frequency

\omega = 2\pi f

now by ohm's law we know that

i = \frac{V}{X}

here we have

i = \frac{V}{\omega L}

so current is inversely depends on the frequency of AC

so if frequency is increased then the current will decrease

6 0
3 years ago
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