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s344n2d4d5 [400]
2 years ago
8

A red blood cell is 7 x 10-6 m in size. This means it is 7 __________ in size. What unit completes the sentence?

Physics
1 answer:
aalyn [17]2 years ago
5 0

If a red blood cell is 7 x 10^-^6 m in size, it means that such a cell is 7 microns or micrometer in size. The unit that completes the sentence will, thus, be microns or micrometer.

According to international system of measurement:

  • 10^{-1} m = decimeter
  • 10^{-2} m = centimeter
  • 10^{-3} m = millimeter
  • 10^{-6} m = micrometer or micron
  • 10^{-9} m = nanometer

Thus, a measurement of 7 x 10^-^6 m is the same is 7 micons or 7 micrometer.

More on metric conversion can be found here: brainly.com/question/17767575

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2. The gravitational field intensity is measured in: a. N c. kg d. Nm2/kg? b. N/kg​
alexdok [17]

Answer:

N/kg

Explanation:

newton/kilogram is the answer.please mark me brainliest

4 0
3 years ago
A car traveling 28 mi/h accelerates uniformly for 8.9 s, covering 599 ft in this time. what was its acceleration? round your ans
almond37 [142]

Answer:

5.90 ft/s^2

Explanation:

There are mixed units in this question....convert everything to miles or feet

    and hr  to s

28 mi / hr = 41.066 ft/s

Displacement = vo t + 1/2 at^2

         599       =  41.066 (8.9)  + 1/2 a (8.9^2)

                      solve for a = ~ 5.90 ft/s^2

5 0
2 years ago
A student holds a bike wheel and starts it spinning with an initial angular speed of 9.0 rotations per second. The wheel is subj
zloy xaker [14]

Answer:

T = 0.00889 N*m

Explanation:

Given the initial speed

Vo = 9.0rev/s.

V = 65 rev/10s

V = 6.5 rev/s.

V = Vo + a*t

Solve to acceleration knowing the initial velocity and the velocity at 10 s

6.5 rev/s - 9 rev/s = a*10s

a = -0.25 rev/s^2.

Now the solve the time at stop time so V=0

V = Vo + a*t

0 = 9.0 - 0.25 rev/s *t,

t = 36 s The Stopping time.

36s -  10s = 26s

The torque can be find using the acceleration using the equation

T = I*a

I = 1/2*m*r^2

I = 1/2*0.725kg*(0.315m)^2= 0.0359kg*m^2

T = 0.0359kg*m^2*-0.25rev/s^2

T = 0.00889 N*m

7 0
3 years ago
Where does the majority of the mass of an atom come from
asambeis [7]

Answer:

The Nucleus

Explanation:

The nucleus contains the majority of an atom's mass because protons and neutrons are much heavier than electrons, whereas electrons occupy almost all of an atom's volume.  I hope this helps you :D

5 0
3 years ago
Read 2 more answers
1. if an egg has a mass of .1k and its dropped from a height of 5 meters, calculate its potential energy at the top
Nataly_w [17]

Answer: (a) 5Joules

(b) 10m/s

(c) 1.0kgm/s

(d) 33.3N

Explanation:

(a) P E = mass * gravity * height

= 0.1*10*5 = 5Joules

(b) All PE is converted to KE

Therefore;

KE = 1/2 * mass * velocity^2

5 = 1/2 * 0.1 * v^2

V = sqrt(100)

v = 10m/s

(c) change in momentum = mass * velocity

= 0.1 * 10

= 1.0kgm/s

(d) impulse = change in momentum

Change in momentum = force * time

1.0 = force * 0.03

Force = 1.0/0.03

Force = 33.3N

Therefore, the force acting on the egg is 33.3N

8 0
3 years ago
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