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lbvjy [14]
3 years ago
5

A bead moves in a fixed direction during an interval. The graph shows the displacement of the bead from its starting point. What

is the instantaneous velocity of the bead at t = 1.50 s ?
A) 3.3 cm/s
B) 4.0 cm/s
C) 5.5 cm/s
D) 6.7 cm/s
Physics
1 answer:
Maksim231197 [3]3 years ago
5 0

Answer:A

Explanation:

I just did the same question on usatestprep

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Usually the force of gravity on electrons is neglected. To see why, we can compare the force of the Earth’s gravity on an electr
miv72 [106K]

Answer:

6.4\cdot 10^{-15} N

Explanation:

The electric force exerted on the electron is given by:

F=qE

where

q=1.6\cdot 10^{-19}C is the magnitude of the electron charge

E = 40000 V/m is the electric field

Substituting,

F=(1.6\cdot 10^{-19} C)(40000 V/m)=6.4\cdot 10^{-15} N

By comparison, the gravitational force exerted on the electron is:

F=mg

where

m=9.10939\cdot 10^{-31} kg is the mass of the electron

g = 9.8 m/s^2 is the acceleration due to gravity

Substituting,

F=(9.10939\cdot 10^{-31} kg)(9.8 m/s^2)=8.93\cdot 10^{-30}N

6 0
4 years ago
A 1000 kg red car traveling at 40 m/s rear ends a 3000 kg blue car traveling at 35 m/s. the cars bounce off each other and the b
klemol [59]

Answer:

32.5 ms⁻¹

Explanation:

<em><u>Theory </u></em>

<u> The law of conservation of linear momentum </u>

The sum of linear momentum of a system under no external force remains constant.

In this scenario although different forces act on two vehicles by each other when we  consider the total system of two cars no external unbalance force act on them. So we can apply this law.

As law says,

The sum of linear momentum before collision = The sum of linear momentum after collision.

Momentum = mass × velocity

1000×40+3000×35 = 1000×v + 3000×37.5

where v = velocity of the red car after the cash

v = 32.5 ms⁻¹

8 0
3 years ago
Which of the following shows the units of angular motion?
Whitepunk [10]

Answer:

  • The units are <em>(</em><em>rad</em><em>/</em><em>s</em><em>^</em><em>2</em><em>)</em><em> </em>
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3 years ago
Although the use of absorbances at 450 nm provided you with maximum sensitivity, the absorbances at, say, 400 nm or 500 nm are n
AleksAgata [21]

Answer:

Yes, the value will be the same.

Explanation:

Yes, or at least to some degree, that value of K will remain the same. You're looking for a difference in absorbance, and the difference should be visible at all wavelengths, not only at the limit. That being said, resolution varies, and if we don't read the value to the maximum, we can get a less accurate reading.

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3 years ago
A certain radioactive isotope has a half-life of approximately 900 years. How many years to the nearest year would be required f
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