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3 years ago

10

Calculate the time needed to drive a car 100 kilometers if the car is traveling at a speed of 70 km/hr.

1 answer:

Elanso [62]3 years ago

7 0

Answer:

D.1.4 hours

Explanation:

$d\ =\ vt$

$t\ =\ \frac{d}{v}$

$t\ =\ \frac{100}{70}$

$t\ =\ 1.42857142857$

Therefore, the answer is D 1.4 hours

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Two spaceships are observed from earth to be approaching each other along a straight line. Ship A moves at 0.40c relative to the

nirvana33 [79]

Answer:

0.80 c

Explanation:

The computation of speed is shown below:-

Here, The speed of the captain ship A report for speed of the ship B which is

$S = \frac{S_A + S_B}{1 + \frac{(S_AS_B)}{c^2} }$

where

$S_A$ indicates the speed of the ship A

$S_B$ indicates the speed of the ship B

and

C indicates the velocity of life

now we will Substitute 0.40c for A and 0.60 for B in the equation which is

$S = \frac{0.40c + 0.60c}{1 + \frac{(0.40c)(0.60c)}{c^2} }$

after solving the above equation we will get

0.80 c

So, The correct answer is 0.80c

5 0

3 years ago

The acceleration of an object is proportional to which of the following

Lana71 [14]

the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

7 0

3 years ago

What gas makes up 75 of earth's atmosphere?

dexar [7]

"Nitrogen gas" makes up 75% (approx. 78%) of the earth's atmosphere

Hope this helps!

6 0

3 years ago

A 85.0kg man and a 65, 0kg woman are riding a Ferris wheel with a radius of 20.0m. What is the Ferris wheels tangential velocity

zvonat [6]

Answer:

The Ferris wheel's tangential (linear) velocity if the net centripetal force on the woman is 115 N is <u>3.92 m/s</u>.

Explanation:

Let's use <u>Newton's 2nd Law</u> to help solve this problem.

F = ma

The force acting on the Ferris wheel is the centripetal force, given in the problem: $F_c=115 \ \text{N}$ .

The mass "m" is the <u>sum</u> of the man and woman's masses: $85+65= 150 \ \text{kg}$ .

The acceleration is the centripetal acceleration of the Ferris wheel: $a_c=\displaystyle \frac{v^2}{r}$ .

Let's write an equation and solve for "v", the tangential (linear) acceleration.

$\displaystyle 115=m(\frac{v^2}{r} )$
$\displaystyle 115 = (85+65)(\frac{v^2}{20})$
$\displaystyle 115=150(\frac{v^2}{20} )$
$.766667=\displaystyle(\frac{v^2}{20} )$
$15.\overline{3}=v^2$
$v=3.9158$

The Ferris wheel's tangential velocity is 3.92 m/s.

8 0

2 years ago

Nicolo` works on weekends at a Slow Food Parlor. He fills a pitcher full of Cola, places it on the counter top and gives the 2.6

Slav-nsk [51]

Answer:4.22 J

Explanation:

Given

mass of pitcher $m=2.6\ kg$

Force applied $F=8.8\ N$

distance moved $s=48\ cm$

Applying work-Energy theorem which states that work done by all the forces is equal to the change in kinetic energy of the object

Work done by force $W=F\cdot s$

W= $8.8\times 0.48 J$

change in kinetic Energy = $\frac{1}{2}mv^2-0$

$8.8\times 0.48=\Delta K.E.$

K.E.-0= $4.22$

K.E.= $4.22\ J$

8 0

4 years ago