If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to havea. a period higher than the original period.
b. a pitch lower than the original pitch.
c. an amplitude lower than the original amplitude.
d. a frequency higher than the original frequenc

Answers

Answer 1

Answer:

Correct answer choice is:

D. A frequency higher than the original frequency.

Explanation:

This is a true case of Doppler's effect. The Doppler effect can be defined as the effect originated by a traveling source of waves in which there is a visible higher variation in pulse for observers towards what the source is progressing and a visible descending shift in rate for observers from what the source is dropping.

Answer 2

Answer:

Answer:

DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD It is D

Explanation:

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Which equation is used to calculate the amount of electrical energy used?a) E = t ÷ P

b) E = t – P

c) E = P + t

d) E = P × t

Answers

Answer:

The equation of amount of electrical energy used $E = P* t$ .

d is correct option.

Explanation:

Electrical energy :

The electrical energy is the chemical energy which is consumed in the electric circuit.

Power :

Electric power is the rate at which energy is transferred from one part to another part of electric circuit.

The amount of electric energy is defined as,

The amount of electrical energy is the product of the power and time.

$E = P* t$

Where, E = energy transferred

P = Power

t = time

Hence, The equation of amount of electrical energy is used $E = P* t$ .

d
cause E=U and in power formula is p=U÷t or E÷t so E=p×t

When you turn on the light switch in a room, you have completed the _____. open circuit series circuit parallel circuit switch circuit

Answers

A.) When you turn on the light switch in a room, you have completed the "Open Circuit"

Hope this helps!

open circuit...by flipping on the switch you close the circuit and allow electrons to flow to the light bulb

Within a single fiber, the tension developed during a twitch depends upon the

Answers

The twitch depends on the skeletal muscle.

This image shows the direction of the flow of water through a constricted pipe. Which of the following happens as you move from position A to position B in the water pipe? A.The velocity of the water decreases.
B.The pressure of the water decreases.
C.The flow rate of the water decreases.
D.The density of the water increases.

Answers

The flow rate of the water decreases as the cross section is decreases. So, the correct option is C.

What is Bernoulli's equation?

Bernoulli’s principle states that the total mechanical energy of a moving fluid, which includes the gravitational potential energy of height, the energy associated with fluid pressure, and the kinetic energy of fluid motion, remains constant.

The formula for Bernoulli’s principle is given as follows:

$p+(1)/(2) pv^2+ pgh= constant$

From the equation of continuity for incompressible fluids which is Bernoulli's equation

a v = constant

where, a is the area and v is the velocity.

Pressure is inversely proportional to the velocity.

$a_Av_A= a_Bv_B$

From the image we can see that area of cross-section at A is greater than at B,

$a_A > a_B$

thus,

$v_A < v_B$

which means velocity of water will increase at B and water pressure will decrease.

Hence, the correct option is C, i.e. the flow rate of water decreases.

Learn more about Bernoulli's equation, here:

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C. The flow rate of the water decreases

Which of the following is most closely related to an activated complex?a. rate limiter
b. energy barrier
c. collision group
d. transition state

Answers

Among the choices above, the one that is most closely related to an activated complex is the transition state. The answer is letter D. This formation forms quickly and does not stay in a way compound is. It usually forms during the enzyme – substrate reaction.

Joseph lifted a parcel from the floor. If he lifts the same parcel twice as high, then it will have ____________. A) Half the weight B) The same weight C) Twice the weight D) A weight of zero