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3 years ago

A load of bricks is lifted to the second floor of a building. How do work and power relate to this job?

Physics

2 answers:

kow [346]3 years ago

6 0

The faster the job is done, the greater the power. Just took the quiz on e2020 got 100%

Nady [450]3 years ago

5 0

The faster the job is done, the greater the power

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Geologists can learn about rock layers beneath the surface of Earth using sound waves. They use a vibration truck to send sound

antiseptic1488 [7]

Answer:

A. Sound waves can travel through and reflect off rock layers.

Explanation:

Reflection seismology is a process of "seeing" below the ground using artificial sources to create sound waves or the process of learning about rock layers beneath the surface of Earth using sound waves.

Sources on land, uses vibration trucks to shake the ground very powerfully to produce sound waves.

Thus, the sound waves will travel through the earth and reflect off rock layers having different acoustic properties. In order to record this reflections, we make use of a small instrument called geophones.

6 0

4 years ago

If an object aquires additional energy, it is also aquiring additional: a) taxes b) vitamins c) mass d) pressure e) buoyancy

ludmilkaskok [199]

Answer:

Option c) mass

Explanation:

With the increase in energy in energy of an object there will be an increase in its mass.

Also from Einstein's mass-energy equivalence,

$E = mc^{2}$

where

m = mass of the object

c = speed of the object (usually speed of light or close to it)

which states that energy and mass are inter convertible.

From which it can be concluded that if an object acquires additional energy, it also acquires additional mass.

3 0

4 years ago

In an NMR experiment, the RF source oscillates at 34 MHz and magnetic resonance of the hydrogen atoms in the sample being in- ve

choli [55]

Answer:

$B_{int}=-0.015T$

Explanation:

From the question we are told that:

RF source oscillation speed $\sigma= 34 MHz$

The external field $Bext =0.78 T$ .

Pro- ton magnetic moment component $\mu=1.41 X 10-26 J/T$

Generally the equation for magnitude of $B_{int}$ is mathematically given by

$B_{int}=B_{ext}-\frac{h\triangle \sigma}{2 \mu}$

$B_{int}=0.78-\frac{6.6*10^{-34}*34*10^6}{2*1.41*10^{26}}$

$B_{int}=0.78-0.7957$

$B_{int}=-0.015T$

6 0

3 years ago

An object slides down a very smooth ramp, with negligible friction. It slides with constant acceleration a under the action of t

sveta [45]

Answer:

In statics condition and if is a body is over plane surface N = mg

In all cases which a body is on a ramp force N will be smaller than mg, and depending on the level of the ramp (bigger the ramp smaller force N)

Explanation:

See annex (Figure 1)

We can see with the help of force diagram the relation between N force and mg

Lets look first the body on the ramp assuming there is not movement

The sum of forces alog y axis = 0

mg* cos∠ BAC = N (normal force)

So N is always a fuction of mg and of the cosine of the inclination angle, and the cosine of angle varies from value 1 when the angle is 0 (look the case where the block is on the surface without inclination N = mg ).

And as the inclination increase the value of cosine will become smaller and so will N force which is directly proportional of cosine of the inclination angle

Therefore we can say that force N is always minor than mg unless in extreme case where the block is over the surface in which case N takes its maximum value N = mg