When an object is placed 8 millimeters from a concave spherical mirror, a clear image can be projected on a screen 16 millimeters in front of the mirror. If the object has a height of 4 millimeters, the height of the image is A. 2 millimeters.
B. 4 millimeters.
C. 8 millimeters.
D. 12 millimeters.

Answers

Answer 1

Answer: The question can be answered by ratio and proportion by similar triangles u/v=Hi/Ho

8 : 16 = x : 4
8 / 16 = x / 4
16x = 32
x = 2

So the correct answer is letter A. 2 millimeters.

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Which of the following is closest to the speed of sound in air at sea level ?a. 3 m/s
b. 30 m/s
c. 330 m/s
d. 3300 m/s

Answers

Closest to speed of sound in air at sea level : C. 330 m/s I think.

A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car?

Answers

75 km/hr, so in other words 75 km per hour.

7200 s / 60 = 120 min
120 min / 60 =2 hr
so 150 km / 2 hr = 75 km per hour

Answer:

The speed of the car is $\boxed{75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}}$ or $\boxed{20.83\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}}$ .

Further Explanation:

Given:

The distance covered by the car is $150\,{\text{km}}$ .

The time taken by the car to cover the distance is $7200\,{\text{s}}$ .

Concept:

The speed of a car is the ratio of the distance covered by the car to the time taken by the car in covering the distance.

The expression for the speed of the car is:

$v = (d)/(t)$ …… (1)

Here, $v$ is the speed of the car, $d$ is the distance covered and $t$ is the time taken by the car.

Substitute the value of distance and time in the above expression.

$\begin{aligned}v &= \frac{{150\,{\text{km}}}}{{7200\,{\text{s}}\left( {\frac{{1\,{\text{hr}}}}{{60 * 60\,{\text{s}}}}} \right)}}\n&= \frac{{150}}{2}\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}\n&= 75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}\n\end{aligned}$

The speed of the car in terms of ${{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}$ can be expressed as.

$\begin{aligned}v&=75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}}{{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}\left( {\frac{{1000\,{\text{m}}}}{{3600\,{\text{s}}}}} \right)\n&=75 *\frac{5}{{18}}\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}\n&= 20.83\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}} \right.\kern-\nulldelimiterspace} {\text{s}}}\n\end{aligned}$

Thus, the speed of the car is $\boxed{75\,{{{\text{km}}} \mathord{\left/{\vphantom {{{\text{km}}} {{\text{hr}}}}} \right.\kern-\nulldelimiterspace} {{\text{hr}}}}}$ or $\boxed{20.83\,{{\text{m}} \mathord{\left/{\vphantom {{\text{m}} {\text{s}}}}\right.\kern-\nulldelimiterspace} {\text{s}}}}$ .

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Answer Details:

Grade:Middle School

Chapter:Speed and distance

Subject:Physics

Keywords:Speed, velocity, distance, time, distance of 150 km, in 7200 s, speed of the car, ratio of distance, rate of change of distance.

How do I use the equation E=MC^2 in relation to atoms to find the amount of energy of a reaction?

Answers

-- Find the mass of all the pieces before the reaction.

-- Find the mass of all the pieces after the reaction.

-- Find the difference . . . (mass before) minus (mass after)

-- If any mass is missing, either you lost track of it, or else
it was converted to energy.

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Which of the following factors does NOT help determine the height, length, and period of a wave?a. wind speed
b. fetch
c. temperature
d. how long the wind blows

Answers

Answer:

Temperature does not determine the height, length and the period of the wave.

Explanation:

Height of the wave shows the amplitude, the length shows the wavelength, and the period of the wave shows the frequency.

The factors that helps to determine the height, length and the period of the wave are :

Wind speed : The speed is equal to the product of the wavelength and the frequency of the wave.
Fetch : It is defined as the horizontal distance where the wind blows.
How long the wind blows : It shows how long the wind blows. It is inversely proportional to the frequency of the wave.

Hence, the correct option is (c) " temperature ".

Final answer:

The temperature, unlike the wind speed, fetch, and duration of wind blow, does not directly help determine the height, length, and period of a wave.

Explanation:

The height, length, and period of a wave are primarily determined by wind speed, the fetch (the distance over which the wind blows across the water surface), and the duration for which the wind blows. Temperature does not directly determine these characteristics of a wave. Therefore, option 'c' is the correct answer.

While temperature can affect the density and viscosity of the medium, and indirectly impact wave speed, it does not directly influence the height, length, and period of a wave in the same way as the other factors.

The factor that does NOT help determine the height, length, and period of a wave is c. temperature. Temperature does not have a direct influence on the characteristics of a wave. The other factors, such as wind speed, fetch, and how long the wind blows, all play a role in determining the properties of a wave.

Learn more about Wave Characteristics here:

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What is the rms Voltage value and why we use it ?

Answers

Suppose that you have an alternating current generator. If you want to get the same result with a direct current (DC) generator, you have to set the voltage to the RMS (Root Mean Square) value of the (AC). In short, RMS is the value of the direct current voltage that is used instead of an alternating current.

The Ptolemaic theory of the universe was disproved bya. Descartes.
b. Kepler.
c. Copernicus.
d. Newton.

Answers

The Ptolemaic theory of the universe wasdisproved by Nicolaus Copernicus (1473–1543), letter C and followed by JohannesKepler (1571–1630). Geocentrictheory suggested that the Sun and moon orbited Earth, and the rest of theplanets orbited the Sun is Heliocentric theory. Heliocentric theory of NicolausCopernicus during the Scientific Revolution on 17th and 18thcentury while Geocentric theory was proposed by Ptolemy (AD 150) and Aristotle.Today, we believe more on the Heliocentric theory and it has been proven aswell.

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