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mariarad [96]
3 years ago
10

The formula d = t² + 5 t expresses a car's distance (in feet) from a stop sign, d, in terms of the number of seconds t since it

started moving.
Determine the car's average speed over the interval of time from t = 4 seconds to t = 7 seconds.
Physics
1 answer:
Lubov Fominskaja [6]3 years ago
3 0

Answer:

The car's average speed is 16 feet per second.

Explanation:

The expression for the average speed is as follows;

A.S=\frac{\textrm{Total distance}}{\textrm{total time}}

Given expression of distance:

d=t^{2}+5t

Put t= 4 s.

d(4)=(4)^{2}+5(4)

d(4)= 36 ft

Put t= 7 s in the given expression.

d(7)=(7)^{2}+5(7)

d(7)= 84 ft

Calculate the car's average speed over the interval of time from t = 4 seconds to t = 7 seconds.

A.S=\frac{d(7)-d(4)}{7-4}

A.S=\frac{84-36}{7-4}

A.S= 16 feet per second

Therefore, the car's average speed is 16 feet per second.

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The period of the wave is 4.35 ms. The sound waves are called longitudinal waves

Explanation:

The period of a wave is related to its frequency by the equation:

T=\frac{1}{f}

where

T is the period

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For the bee in this problem, the frequency of the sound wave emitted by it is

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Therefore, the period of the sound wave is

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The sound wave is a type of wave called longitudinal wave. In longitudinal waves, the oscillation of the medium occurs in a direction parallel to the direction of motion of the wave: therefore in a sound wave, the particle of the medium (air, in this case) oscillate back and forth along the direction of propagation of the wave, forming alternating areas of higher density of particles (called compressions) and of lower density of particle (called rarefactions).

The other type of wave, instead, is called transverse wave. In a transverse wave, the oscillation of the wave occurs in a direction perpendicular to the direction of motion of the wave. An example of transverse waves are the electromagnetic waves, which consists of electric field and magnetic fields that vibrate in a plane perpendicular to the direction of motion of the wave itself.

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5 0
3 years ago
Short Answer Questions:
Otrada [13]

According to Archimede's principle, a physical object experiences an upthrust due to a difference in pressure between upper and lower  surfaces.

<h3>What is an upthrust?</h3>

An upthrust is also referred to as buoyancy and it can be defined as an upward force which is exerted by a fluid (liquid or gas), so as to oppose the weight of a partially or fully immersed physical object that is floating in it.

Based on scientific information, a physical object experiences an upthrust when it is immersed in a fluid due to a difference in height and pressure between upper (top) and lower (bottom) surfaces.

According to Archimede's principle, there is a higher pressure at the bottom of the physical object due to height, and a lower pressure at the top of the physical object.

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Answer:

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