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sattari [20]
3 years ago
10

A ball is projected horizontally from the top of a hill with a velocity of 30m/s if it reaches the ground 5sec later the height

of the hill is???
Physics
1 answer:
Vikki [24]3 years ago
7 0

Answer:

The hill is a total of 150 meters tall

Explanation:

30×5=150

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How much heat must be removed from 200 pounds of blanched vegetables at 189 degrees F to freeze them to a temperature of 22 degr
Virty [35]

To solve this problem it is necessary to apply the concepts related to heat exchange in the vegetable and water.

By definition the exchange of heat is given by

Q =mc\Delta T

where,

m = mass

c = specific heat

\Delta T = Change in temperature

Therefore the total heat exchange is given as

\Delta Q = Q_w+Q_v

\Delta Q = m_wc_w(T_i-T_f)+m_vc_v(T_i-T_f)

Our values are given as,

Total mass is M_T = 200lb ,however the mass of solid vegetable and water is given as,

m_v= 0.4*200lb = 80lb

m_w=0.6*200lb=120lb

T_i = 183\°F\\T_f = 22\°F\\c_w = 1Btu/lbF\\c_v = 0.24Btu/lbF

Replacing at our equation we have,

\Delta Q = m_wc_w(T_i-T_f)+m_vc_v(T_i-T_f)

\Delta Q = (120)(1)(183-22)+(80)(0.24)(183-22)

\Delta Q = 22411.2Btu

Therefore the heat removed is 22411.2 Btu

6 0
3 years ago
If you precisely measure the position of a particle, you
pochemuha
<h2>Answer: destroy all information about its speed or momentum</h2>

The Heisenberg uncertainty principle postulates that the fact that <u>each particle has a wave associated with it</u>, imposes restrictions on the ability to determine its <u>position</u> and <u>speed</u> at the same time.  

In other words:  

<h2>It is impossible to measure <u>simultaneously </u>(according to quantum physics), and with absolute precision, the value of the position and the momentum (linear momentum) of a particle.  </h2>

So, the greater certainty is seeked in determining the position of a particle, the less is known its linear momentum and, therefore, its mass and velocity.  

It should be noted that this uncertainty does not derive from the measurement instruments, but from the measurement itself. Because, even with the most precise devices, the uncertainty in the measurement continues to exist.  

Thus, in general, the greater the precision in the measurement of one of these magnitudes, the greater the uncertainty in the measure of the other complementary variable.  

3 0
3 years ago
The angle at which a wave strikes a surface is ___ the angle at which the wave is reflected.
Art [367]

Answer:

a)equal to

Explanation:

properties of a wave

applies in reflection

others include:refraction,diffraction,interference

5 0
3 years ago
PLEASE HELP THIS IS SCIENCE
jeka94
It should be the second one
4 0
3 years ago
Consider the power dissipated by the two circuits in the video. The ratio of power dissipation in the parallel circuit to that i
klemol [59]

Answer:

A)

Explanation:

  • In a series circuit,  if we assume that each bulb has a resistance R, the equivalent resistance, is the sum of all the resistances, in this case, 3*R.
  • The power dissipated in this resistance, can be expressed as follows:

       P_{series}  = V*I = V*(\frac{V}{R_{eq}})  = \frac{V^{2}}{3*R} (1)

  • In the parallel circuit, the equivalent resistance, is equal to 1/3*R.
  • The power dissipated in this resistance, can be expressed as follows:

       P_{//}  = V*I = V*(\frac{V}{R_{eq}})  = \frac{V^{2}}{\frac{R}{3} } (2)

  • In order to take the ratio of both powers, we can divide both sides of (1) and (2) , as follows:

        \frac{P_{//} }{P_{series} } =\frac{V^{2}}{\frac{R}{3}} * \frac{3*R}{V^{2}} = 9

  • The ratio of power dissipation in the parallel circuit to that in the series circuit is 9 times.
5 0
4 years ago
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