What is one property of a wave that determines how much it will diffract when it encounters an obstacle?-speed
-amplitude
-polarization
-wavelength

Suppose two waves collide, and the temporary combined wave that results is smaller than the original waves. What term best describes this interaction?
-diffraction
-destructive interfernce
-standing wave formation
-constructive interfernce

The formation of a standing wave requires
-the traveling of a wave for a long distance
-constructive interference between two waves of slightly different frequencies
-that refraction and diffraction occur at the same time in a wave
-interference between incoming and reflected waves

Answers

Answer 1

Answer: 1) D -wave length
2) B-destructive interference
3)D -interference between incoming and reflective waves

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I throw a stone off a cliff 32 feet above the water. The height of the stone in terms of time (in seconds) is given by h(t) = -16t2 + 128t + 32. At what time will the stone splash into the water? Round your answer to nearest tenth of a second
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a car with a mass of 2000 kilograms is moving around a circular curve at a uniform velocity of 25 meters per second. The curve has a radius of 80 meters. What is the centripetal force on the car

Answers

In the given problem, we say various information's that are going to help us reach the ultimate answer to the question. Let us first write the information's that have been presented in front of us.
Mass of the car = 2000 kg
Velocity of the car = 25 m/s^2
Radius of the circle = 80 m
Now we already know the equation for calculating the centripetal force and that is
Centripetal Force = [mass * (velocity)^2]/Radius
      = [2000 * (25)^2]/80
      = (2000 * 625)/80
      = 1250000/80
      = 15625
So the centripetal force on the car is 15625 Newtons

your answer is 15,625 N

i just took the test

What is the purpose of sensory adaptation

Answers

Sensory adaptation is when the sensory receptors change and adapt to different stimuli. For example in a darkened room your pupils enlarge allowing more of the available light in. This is why you can see a little better in the dark after you get used to it.

Sensory adaptation is a phenomenon in which sensory neurons change their level of sensitivity to a constant stimulus over time. This adaptation allows people to adapt to their environments while balancing the need to receive new sensory input. Neurons involved with smell, hearing, taste, touch, and sight can all exhibit this phenomenon.

A fixed mass of gas has a volume of gas of 25cm3. the pressure of the gas is 100kPA. the volume of the gas is slowly decreased by 15cm3 at a constant temperature. what is the change in the pressure of the gas?a) 67kPA
b) 150kPA
c) 170kPA
d) 250kPA
give reasons

Answers

A fixed mass of gas has a volume of 25 $cm^3$ , the pressure of the gas is 100 kPa, the volume of the gas is slowly decreased by 15 $cm^3$ at a constant temperature, and the change in pressure of the gas is 150 kPa, which is option b.

What is the calculation of the change in pressure?

PV = nRT (P= pressure of the gas, V =volume, n = number of moles of gas, R = gas constant, and T =temperature of the gas in kelvin)

Suppose the gas is an ideal gas and that the temperature is constant,

P1V1 = P2V2

Here P1 = 100 kPa, V1 = 25 $cm^3$ , V2 = 10 $cm^3$ ,

100 kPa x 25 $cm^3$ = P2 x 10 $cm^3$

P2 = (100 kPa x 25 $cm^3$ ) / 10 $cm^3$

P2 = 250 kPa

the change in pressure of the gas is,

ΔP = P2 - P1 = 250 kPa - 100 kPa = 150 kPa

The reason is that when the volume of a fixed mass of gas is decreased, the pressure of the gas increases proportionally, so here assuming that the temperature is constant it is calculated.

Hence, the volume of the gas is slowly decreased by 15 $cm^3$ at a constant temperature, and the change in pressure of the gas is 150 kPa, which is option b.

Learn more about the calculation of the change in pressure here.

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two truckers are traveling directly away from each other at the same speed. If one trucker sounds her horn at a frequency of 206 Hz, and the other trucker hears a frequency of 189 Hz, determine the speed of the trucks. Use the speed of sound as 343 m/s. m/s

Answers

Answer:

v' = 14.76 m/s

Explanation:

given,

frequency of the one truck = 206 Hz

apparent frequency ,f' = 189 Hz

speed of sound, v = 343 m/s

speed of observer (v_o)and source (v_s) = v'

now, using Doppler's effect

$f' = (v-v_o)/(v+v_s)\ f$

$f' = (v- v')/(v+v')\ f$

$189 = (343- v')/(343+v')\ 206$

$0.9174= (343- v')/(343+v')$

314.69 + 0.9174 v' = 343 - v'

1.9174 v' = 28.30

v' = 14.76 m/s

hence, the speed of the truck is equal to 14.76 m/s

What is the minimum speed with which he’d need to run off the edge of the cliff to make it safely to the far side of the river? the answer was 6 m/s the world-record time for the 100 m dash is approximately 10 s. given this, is it reasonable to expect brady to be able to run fast enough to achieve brady's leap? a.yes, the obtained speed is less than the world-record.
b.yes, the obtained speed is almost equal to the world-record.
c.no, the obtained speed is greater than the world-record.
d.no, the obtained speed is almost equal to the world-record.

Answers

The answer is

A. Yes, the obtained speed is less than the world record

The explanation:

when the obtained speed is 6 m /s

and the world record speed = distance / time = 100 m / 10 s = 10 m/s

So, Yes, the obtained speed is less than the world record

Not only is it less, its also a reasonable average speed for a somewhat athletic person. Therefore, the leap is entirely possible.

-Samuel Brady gained his lasting notoriety for his leap over the Cuyahoga River around 1780 in what is now Kent, Ohio. After following a band of Indians into the Ohio country, a failed ambush attempt resulted in the band chasing Brady near the Cuyahoga River. To avoid capture, Brady leaped across a 22-foot (6.7 m) wide gorge of the river (which was widened considerably in the 1830s for construction of the Pennsylvania and Ohio Canal) and fled to a nearby lake where he hid in the water under a fallen tree using a reed for air.

Part (a): The minimum speed of Brady should be $\boxed{6\text{ m/s}}$ to cross the cliff.

Part (b): The speed of Brady’s leap is possible to achieve, as it is less than the speed of world record.

Further Explanation:

(a)

Brady jumps from a cliff to go on other side. He crosses $22\text{ ft}$ horizontal distance from a height of $20\text{ft}$ . To jump from cliff, he follows the Newton’s law of motion.

Given:

The horizontal distance is $22\text{ ft}$ .

The vertical distance is $20\text{ft}$ .

Concept:

The horizontal distance in meter is $6.71\text{ m}$ .

The vertical distance in meter is $6.10\text{ m}$ .

To obtain the time of flight, applying one of the equation of motion given as:

$s=ut+(1)/(2)at^2$

Substitute $0\text {m/s}$ for $u$ and rearrange the above equation for $t$ :

$t=\sqrt{(2s)/(a) }$

Substitute $6.10\text{ m}$ for $s$ and $9.81\text{ m}/\text{s}^2$ for $a$ in above equation.

$\begin{aligned}t&=\sqrt{(2*6.10)/(9.81)}\text{ s}\n&=1.12\text{ s}\end{aligned}$

The time of flight and time taken to cover horizontal distance are equal.

Horizontal velocity of Brady given as:

$\begin{aligned}v&=(6.71)/(1.12)\text{ m/s}\n&\approx6\text{ m/s}\end{aligned}$

Thus, the minimum speed of Brady should be $\boxed{6\text{ m/s}}$ to cross the cliff.

(b)

The minimum speed with which Brady is running is $6\text{ m/s}$ .

The speed of world record given as:

$\begin{aligned}V&=(100)/(10)\text{ m/s}\n&=10\text{ m/s}\end{aligned}$

Thus, the speed of Brady’s leap is possible to achieve, as it is less than the speed of world record.

Learn more:

1. Projectile motion of a body: brainly.com/question/11023695

2. Body in pure rolling motion: brainly.com/question/9575487

3. Newton’s law of motion: brainly.com/question/6125929

Answer Details:

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords:

1780, Brady's Leap, Captain, Sam, U.S. Continental Army, horizontally, cliff, Ohio's Cuyahoga, gorge, leap, 22 ft, 20 ft, minimum, speed, river, 100 m, dash, 10 s, jump, time of flight, vertical and distance.

A chunk of aluminum at 91.4°C was added to 200.0 g of water at 15.5°C. The specific heat of aluminum is 0.897 J/g°C, and the specific heat of water is 4.18 J/g°C. When the temperature stabilized, the temperature of the mixture was 18.9°C. Assuming no heat was lost to the surroundings, what was the mass of aluminum added?

Answers

Final answer:

The mass of the aluminum added is calculated through the principle of conservation of energy, specifically thermal energy. By considering the heat lost by the aluminum and gained by the water, we can rearrange the equation for heat transfer and find that the mass of the aluminum is approximately 37.9 grams.

Explanation:

In this physics question, we're looking at a thermodynamic process involving a chunk of aluminum and water. Given the known values of their respective specific heats, the mass of water, and their final equilibrium temperature, we're aiming to find the mass of the aluminum.

We begin by understanding that in a closed system, the heat gained by one body is equal to the heat lost by another. In this case, the aluminum is losing heat, and the water is gaining it. The equation for heat transfer (Q = mcΔT), where m is mass, c is specific heat, and ΔT is change in temperature.

The heat gained by the water = mass of water * specific heat of water * change of temperature in water = 200g * 4.18J/g°C * (18.9°C - 15.5°C) = 2836.4J.

This is equal to the heat lost by the aluminum. Solving the analogous heat equation for the mass of the aluminum gives us the answer:

m = Q / (c * ΔT) = 2836.4J / (0.897J/g°C * (91.4°C - 18.9°C)) = 37.9g

So the mass of the aluminum is approximately 37.9 grams.

Learn more about Thermodynamics here:

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