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4 years ago

Galileo determined that all objects fall to Earth with the same acceleration. What is the one requirement for this to be true?

Physics

2 answers:

s344n2d4d5 [400]4 years ago

7 0

The answer is C. The objects must be in free fall

densk [106]4 years ago

5 0

Hi there human, potato or any other specie out there! (I’m a unicorn nice to meet you :) hrrrrrr)

The answer is c my friend!

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1. A wheel has a radius of 4.1 m. How far (path length) does a point on the wheel travel if the wheel is rotated through angles

Olin [163]

Answer:

a) 2.15 m

b) 123 m

c) 772.8 m

Explanation:

Circular Motion

One point located at a distance r from the center of rotation travels a distance L given by the arc length :

$L= \theta r$

Where $\theta$ is the angle formed during the rotation.

The wheel described in the question has a radius r=4.1 m and a point on the wheel rotates some angles given in each part:

a) $\theta=30^o=30\cdot \pi / 180=\pi/6 \ rad$

Calculating L

$L= \pi/6 \cdot 4.1=2.15 \ m$

b) $\theta=30\ rad$

$L= 30 \cdot 4.1=123 \ m$

c) $\theta = 30\ revolutions = 30\cdot 2\pi\ rad=60\pi \ rad$

$L= 60\pi \cdot 4.1=772.8 \ m$

5 0

3 years ago

A 384 m long train is moving on a straight track with a speed of 77.3 km/h. The engineer applies the brakes at a crossing, and l

solniwko [45]

Answer:

The time the train blocked the crossway is

0.007934h=0.476 min=28.6 s

Explanation:

The average speed is given by

V= (Vi+Vf)/2

and

V= dx/dt

Where

Vi= initial speed

Vf= final speed

dx= change of position=0.384 km

dt=time the train blocked the crossway

dt=2dx/(Vi+Vf)

dt=2*0.384 km/(77.3 +19.5) km/h

dt=0.007934h

dt=0.007934h*(60min/1h)=0.476 min

dt=0.476 min*(60s/1min)=28.6 s

7 0

3 years ago

To meet a U.S. Postal Service requirement, employees' footwear must have a coefficient of static friction of 0.5 or more on a sp

Vlada [557]

Answer:

the minimum time interval is 0.77 seconds

Explanation:

given data

coefficient of static friction = 0.5

coefficient of static friction shoes= 0.825

travel s = 2.40 m

to find out

what is the minimum time interval

solution

we know newton 2nd law

force = mass × acceleration

and

force acting on person due to friction

force = coefficient of static friction shoes × mg

so we can say

coefficient of static friction shoes × mg = ma

a = coefficient of static friction shoes × g

and we know g is 9.8 m/s²

distance formula by kinematic relation

distance = ut + 0.5 × at²

here put a value and u is zero because initial speed

2.40 = 0 + 0.5 × coefficient of static friction shoes × g× t²

2.40 = 0.5 × 0.825 × 9.8 × t²

t = 0.77 s

the minimum time interval is 0.77 seconds

5 0

4 years ago

2. Interpret Visuals If a certain

Firdavs [7]

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Explanation:

6 0

3 years ago

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Why does a tail appear when a comet nears the sun?

ahrayia [7]

It heats up. the ice transforms directly from a solid to a vapor, releasing dust particles. the solar wind sweeps the material and it forms what to appears to be a tail.

3 0

4 years ago