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3 years ago

If a 100N weight sits in an express elevator what will be the weight when the elevator is traveling at a constant speed

1 answer:

4 0

This is a "trick" question.

If the elevator is traveling at constant speed, it means it is at rest. This means anything inside the elevator traveling at constant speed, weights the same as in an elevator not moving -also at rest-.

So the 100N weight's weight doesn't change in an elevator traveling at constant speed.

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__________ receptors detect presence of acids in substances, whereas __________ receptors detect sodium in substances. A. Sour .

Irina18 [472]

Answer:

A sour and salt

Explanation:

7 0

4 years ago

Read 2 more answers

Car a is heading north with a velocity of 14 m/s. car b is traveling north also, with a velocity of 19 m/s. what is the relative

kicyunya [14]

a.) Relative velocity = velocity of car B - velocity of car A
= 19 - 14
= 5 m/s
Hope this cleared your doubt, feel free to ask any question regarding this and have a nice day ahead! :)

6 0

4 years ago

Read 2 more answers

An 0.80-m aluminum bar is held with its length parallel to the east-west direction and dropped from a bridge. Just before the ba

Dimas [21]

Answer:

a) $B=2.9891\times 10^{-5}\,T$

b) west end of the bar is positive.

Explanation:

Given:

emf induced in the bar, $\epsilon=5.5\times 10^{-4}\,V$

length of the bar, $l=0.8\,m$

velocity of the bar at the given instant, $v=23\,m.s^{-1}$

(a)

The magnitude of the horizontal component of the Earth's magnetic field(B):

We know:

$\epsilon=B.l.v$

$5.5\times 10^{-4}=B\times 0.8\times 23$

$B=2.9891\times 10^{-5}\,T$

(b)

Using Fleming's left hand rule we determine that the current is flowing towards east end of the bar i.e. west end of the bar is positive.

4 0

3 years ago

What does EMR tell us about wavelength, amplitude, and frequency?

Georgia [21]

Answer:

Amplitude is one-half the height of the wave from peak to trough. Wavelength and frequency are inversely proportional: As the wavelength increases, the frequency decreases.

I hope this helps in a way...

5 0

3 years ago

Determine the ratio of the resistivity of pure water to silver?

kondor19780726 [428]

Answer:

$3 \cdot 10^{11} : 1$

Explanation:

Silver is a generally excellent conductor, this implies its resistivity is low (from table, we can check the exact worth i.e $\rho_s = 1.6 \cdot 10^{-8} \Omega m$ )

Pure water, rather, is an extremely awful conductor, this implies its resistivity is exceptionally high, of order of $k \Omega \cdot m (10^3 \Omega m )$

Indeed, even without knowing the exact estimation of the pure water resistivity, we can appraise the proportion between the pure water resistivity and the silver resistivity by looking at the two orders of magnitude:

$r= \frac{10^3 \Omega m}{10^{-8} \Omega m} \sim 10^{11}$

Therefore, we can say that the correct answer is

$3 \cdot 10^{11} : 1$

4 0

3 years ago