PHYSICS HIGH SCHOOL

The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 67 m when wurth (jaw6696) – Ch 2 LT 3/4 – kreft – (61920) 2 thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m.

Answers

Answer 1

Answer:

Answer:

402m

Explanation:

We can solve this easily by using the free fall formula:

$v_f^2=v_0^2+2ad$

On both cases the final velocity will be 0m/s (maximum height), so we have:

$v_0^2=-2ad$

We know that the velocity the person imparts to the ball will be the same either on Earth or on the Moon, so we write for both cases:

$v_0^2=-2a_Ed_E$

$v_0^2=-2a_Md_M$

Which means

$2a_Ed_E=2a_Md_M$

So we get (taking into account that gravity on earth is 6 times gravity on the Moon):

$d_M=(a_Ed_E)/(a_M)=(6a_Md_E)/(a_M)=6d_E=6(67m)=402m$

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A speeder passes a parked police car at a constant speed of 23.3 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.75 m/s 2 . How much time passes before the speeder is overtaken by the police car? Answer in units of s.

Answers

Answer:

32s

Explanation:

We must establish that by the time the police car catches up to the speeder, both have travelled a certain distance during the same amount of time. However, the police car experiences accelerated motion whereas the speeder travels at a constant velocity. Therefore we will establish two formulas for distance starting with the speeder's distance:

$x=vt=23.3(m)/(s)t$

and the police car distance:

$x=vt+(at^(2))/(2)=0+(2.75(m)/(s^(2)) t^(2))/(2)=0.73(m)/(s^(2))$

Since they both travel the same distance x, we can equal both formulas and solve for t:

$0 = 0.73(m)/(s^(2))t^(2)-23.3(m)/(s) t\n\n0=t(0.73(m)/(s^(2))t-23.3(m)/(s) )\n\n$

Two solutions exist to the equation; the first one being $t=0$

The second solution will be:

$0.73(m)/(s^(2))t=23.3(m)/(s)\n\nt=(23.3(m)/(s))/(0.73(m)/(s^(2)))=32s$

This result allows us to confirm that the police car will take 32s to catch up to the speeder

Which statement is true about the energy of electromagnetic radiation? A.the frequency of the emmited radiation is inversely proportional to its energy. B.the frequency of the emitted radiation is directly proportional to its energy C.the wavelength of the emitted radiation is directly proportional to its energy. D.the amplitude of the emitted radiation is inversely proportional to its energy.

Answers

The frequency of the emitted radiation is directly proportional to its energy

Answer: Option (B) is the correct answer.

Explanation:

The radiation in which waves of electromagnetic field travel or propagate through the space and carries electromagnetic radient energy is known as electromagnetic radiation.

The relation between energy and frequency is as follows.

$E = h \nu$ ............ (1)

where, E = energy

h = plank's constant

$\nu$ = frequency

Therefore, the frequency of the emitted radiation is directly proportional to its energy.

Also, frequency is proportional to c over wavelength. The relation is as follows.

$\nu = (c)/(\lambda)$ ........ (2)

where, $\nu$ = frequency

c = speed of light

$\lambda$ = wavelength

Placing the value of frequency from equation (2) to equation (1) as follows.

$E = (hc)/(\lambda)$

Thus, the wavelength of the emitted radiation is inversely proportional to its energy.

The main difference between the internal combustion engine and the diesel engine is that the diesel engineA. has no connecting rods.
B. does not have a crankshaft.
C. has no ignition system.
D. does not utilize pistons.

Answers

The correct answer is (b.) does not have crankshaft. The main difference between the internal combustion engine and the diesel engine is that the diesel engine does not have a crankshaft. The crankshaft is for the conversion of the reciprocal into a circular motion.

A car travels 30 km north in 25 min. and 40 km east in 35 min. What is the total distance traveled?10 km
50 km
70 km
cannot be determined

Answers

Answer:

The answer is 70 km

Explanation:

Firstly, there are few facts that we have to know:

The car travels northward and then eastward, so both direction are perpendicular.
It doesn't matter the total time, because we already know the total distance in every direction.
The question is about distance, NOT displacement. I have attached an image that shows the difference between both concepts.

Finally, the first 25 min the car traveled in total 30 km and after that, the car traveled in total 40 km during 35 min. So, the total distance is:

30+40=70 km.

Correct answer is 70 KM.

The reason why the position of an electron cannot be measured with absolute precision is:

Answers

They are too small are never in the same place. Electrons are constantly moving in random motion within the electron cloud, making them impossible to follow.

What parts of an atom can change during a nuclear reaction that cannot change during a chemical reaction? Question 15 options: A. The number of protons and neutrons B. The number of electrons only C. The number of protons and electrons D. The number of neutrons and electrons

Answers

Answer;

B. the number of protons and neutrons

Explanation;

Nuclear reactions involve a change in the nucleus of an atom, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei.
Therefore the parts of an atom that can change during a nuclear reaction but can not change during a chemical reaction is the number of protons and neutrons that are found in the nucleus.

Neutrons and protons cannot be removed from nucleus from chemical reactions because they are strongly held together but nuclear reactions are strong enough to separate them. Hence option A is correct.

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