PHYSICS HIGH SCHOOL

Two tuning forks, 254 Hz. and 260 Hz., are struck simultaneously. How many beats will be heard?8

4

6

Answers

Answer 1
Answer:
The longer you continue to listen, the more beats will be heard.

They'll occur at the rate of (260Hz - 254Hz) = 6 Hz .
 
Answer 2
Answer:

Answer:

6.00 beats per second

Explanation:

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Which type of electromagnetic radiation cannot be focused? A. Gamma rays   B. X-rays   C. Ultraviolet   D. Infrared
a gust of wind blows an apple from a tree. As the apple falls, the gravitational force on the apple is 2.25N downward and the force of the wind on the apple is 1.05N to the right. Find the magnitude and the direction of the net force on the apple.
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Help Please ! A fisherman casts his lure at an angle of 33 degrees above the horizontal. The lure reaches a maximum height of 2.3 m. Assuming no frictional forces, what was the initial velocity the fisherman gave the lure when he cast it? 12.34 m/s


28.45 m/s


34.91 m/s


21.29 m/s

Answers

The initial velocity is 12.34 m/s

Explanation:

The vertical component of the initial velocity determines the maximum height.

The formula to apply is : v²=u²+2as , where

v=y-component, final velocity = 0 m/s

u= y-component of the initial velocity = ?

s= distance traveled = 2.3 m

a=acceleration due to gravity = -9.81 m/s²

Using the values in the equation

v²=u²+2as

0²=u²+2×2.3×-9.81

0=u²-45.126

45.126=u²

√45.126= u

6.7175 m/s

The vertical component of velocity is given by;

velocity*sin(angle with horizontal)

velocity=6.7175 / sin 33°

=12.338 m/s

=12.34 m/s

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Keywords : angle, maximum height, initial velocity, friction

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You pull a sled with a package on it across a snow-covered flat lawn. If youapply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. What is the
combined mass of the package and the sled? (Assume there is no friction.)

Answers

You pull a sled with a package on it across a snow-covered flat lawn. If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg

The given data to find Mass,

The force applied to the sled, F = 65.1 N

Acceleration of the sled, a = 1.24 m/s²

What is force?

Forces are defined by both strength and direction.

Force is a vector quantity. It is a quantity that is described by Magnitude and Direction. The strength of a force is its magnitude and the direction, well it is the direction the magnitude is applied on the object.

We need to find the combined mass of the package and the sled. Let it is m. Using definition of force as follows :

F = ma

m = F/a

m = 65.1 /1.24

Mass, m = 52.5 Kg.

If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg

Hence, Option C is the correct answer.

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Answer:52.5

Explanation:

Rarefaction occurs only in a _______ wave. A. sympathetic.
B. longitudinal.
C. transverse.
D. forced.

Answers

Rarefaction occurs only in a longitudinal wave.

What is refraction?

A light beam refracts whenever it reaches an angled material with a different refractive index. A change in direction results from this acceleration. As an example, consider air entering the water. The speed of the light decreases as it continues to travel at a changingangle.

Transverse waves do not experience rarefaction, which is a phenomenon that only happens in longitudinal waves.

This is due to the fact that longitudinal waves cause the medium through which they travel to be compressed and rarefied.

Transversewaves, however, feature oscillations that are parallel to the direction of the wave.

With a longitudinal wave, the medium's particles are moved along with the wave in the same direction.

Both zones of compression and rarefaction result from this, with the former having the particles closer together than they would be in their equilibrium state.

The wave is produced by the pattern of compression and rarefaction.

Due to the displacement of the medium's particles in the same direction as the wave's propagation, rarefaction only happens in longitudinal waves, where it results in places where the particle spacing is greater than it would be in the equilibrium state.

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The correct answer to the question is : B) Longitudinal wave.

EXPLANATION:

Before coming into any conclusion, first we have to understand the nature of sound wave.

The sound wave is a longitudinal wave in which the direction of vibration of particles are parallel to the direction of wave propagation.

In this type of wave, one will find compression and rarefaction. Compression is the high pressure region in which the particles are closely aggregated to each other.

Rarefaction is the low pressure region in which the particles are far away from each other. There is large separation between particles as compared to compression.

Hence, the correct answer is sound wave.

What would be the result of an alpha particle coming into a magnetic field?A) The alpha particle will stop moving.
B) The alpha particle will reverse its direction.
C) The alpha particle will be deflected in a curve path.
Eliminate
D) The alpha particle will continue to travel in a straight line.

Answers

Answer:

C. The alpha particle will be deflected in a curve path.

Alpha particles are nuclei of helium and consist of two neutrons and two protons. So, they are positively charged.

Then the alpha particle will be deflected by a magnetic field.

Usain bolt can run the 100 m dash in 9.58 s. what is usain's average acceleration during this sprint?

Answers

Assuming Usain Bolt starts from rest (so, its initial velocity is zero), and that his motion is uniformly accelerated, his position at time t  is given by
S(t) = (1)/(2)at^2
where a is the average acceleration and t the time. In our problem, the distance covered is S=100 m and the time taken is t=9.58 s, therefore the average acceleration can be found by re-arranging the previous formula:
a= (2S)/(t^2)= ((2)(100 m))/((9.58 s)^2)=2.18 m/s^2

Which of the following statements are true?A. Energy as heat flows from a lower temperature to a higher temperature
B. Energy as heat flows from a higher temperature to a lower temperature
C. The amount of het in a closed system is constant
D. Energy as heat flowing into an object is determined by the amount of work done on the object.

I know the answer is not C.

Answers

'B' and 'C' are both true.
B. Energy as heat flows from a higher temperature to a lower temperature.
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Mike has a mass of 97 kg. He jumps out of a perfectly good airplane that is 2000 m above the ground. After he falls 1000 m, when his downward speed is 68 m/s, Mike opens his parachute. The positive y-direction is downward.(a) Calculate the average magnitude of the upward force of the air resistance on Mike during his initial descent.(b) After Mike opens his parachute, he continues to descend, eventually reaching the ground with a speed of 4.0 m/s. Calculate the average upward force during this part of Mike's descent.(c) At the same time Mike jumps out of the airplane, his wallet (mass of 0.3 kg) falls out of his pocket. Calculate the wallet's downward speed when it reaches the ground. For this calculation, assume that air resistance is negligible.