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3 years ago

How can you be both at rest and also moving at 100,000 km/h at the same time

1 answer:

7 0

You could be lying completley still on your bed, and all though it seems you are at rest, you are moving along with the earth around the sun and hence are motion. This is why 'being at rest' is more of a relative term. Hope this helps!

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EXPERTS/ACE and people that wanna help 4 sure only!

oee [108]

To do this you want to solve for one variable at a time. So we want to cancel out a variable. Lets cancel x. I will multiply the first equation by the number 4 to get 4y=4x-16.
Now lets solve equation 2 for y, giving
-3y=-4x+3 now add equation 1 to equation 2
Y =-13
Now plug that back in to either
-13=x-4
X=-9
So the answer is (-9,-13)

7 0

3 years ago

A strip of copper 150 µm thick and 4.50 mm wide is placed in a uniform magnetic field of magnitude B = 0.74 T, that is perpendic

Sophie [7]

Answer:

V = 6.55*10^{-6} v

Explanation:

The number density can be determined by using below formula:

$n = \frac{Bi}{Vle}$

where,

B is uniform magnetic field 0.74

i is current 18 A

V is hall potential difference

l is thickness 150 MICRO METER

e is electron charge 1.6 *10^{-19} C

therefore V can be determined as

$V = \frac{iB}{nle}$

$V = \frac{18*0.74}{8.47*10^{28}*150*10^{-6}*1.6 *10^{-19}}$

V = 6.55*10^{-6} v

8 0

3 years ago

A bird watcher meanders through the woods, walking 1.62 km due east, 0.246 km due south, and 3.08 km in a direction 50.4 ° north

Liula [17]

Answer:

Displacement CO=2.15 Km

Average velocity = 1.99 Km/h

Explanation:

Given

Total time = 1.08 h

OA= 1.62 Km

AB=0.246 Km

BC=3.08 Km

θ=50.4°

CE=3.08 sin50.4° =2.37 Km

BE=3.08 cos50.4° =1.96 Km

CE=AB+OD

OD=CE-AB

OD=2.37-0.246

OD=2.124 Km

BE=CD+OA

CD=BE-OA

CD=1.96-1.62

CD=0.34 Km

Now CO

$CO=\sqrt{CD^2+OD^2}$

$CO=\sqrt{0.34^2+2.124^2}$

CO=2.15 Km

So the displacement CO=2.15 Km

Average velocity =Displacement/Time

Average velocity = 2.15/1.08 Km/h

Average velocity = 1.99 Km/h

8 0

4 years ago

The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest an

Mariulka [41]

Answer: a= 4.4ms-2

Displacement= 26.95 m

Explanation:

First, the speed in km/hr must be converted to m/s so that we can apply it in solving the question. The motion started from rest hence the initial velocity is 0m/s. The average displacement is also obtained from the equations of motion as shown in the image attached.

7 0

4 years ago

Read 2 more answers

State four advantages of Mercury over alcohol as thermometric liquids

Gemiola [76]

Answer:

Alcohol wets glass while mercury doesn't
Alcohol has a lower boiling point and hence cannot be used to measure very high temperature.
Alcohol is colorless and is very difficult to read without coloration.
Mercury's expansion is uniform.

6 0

3 years ago