Sound is a ____ wave. A large boulder falls from an underwater ledge and crashes on the floor of the ocean. A pod of dolphins is 800 meters away. Determine how long it takes for the sound of the crash to reach the dolphins. 0.5 sec 0.3 sec 2.3 sec 1.9 sec

Answers

Answer 1

Answer: sound waves are longitudal waves meaning they go back and forth

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If the velocity of a body changes from 13 m/s to 30 m/s while undergoing constant acceleration, what's the average velocity of the body? A. 28 m/s B. 17 m/s C. 21.5 m/s D. 19.5 m/s

In which state of matter is a substance unable to transfer heat by convection?

Answers

Convection is the actual physical motion of heated material rising and cool material sinking.
That's not possible in a solid ... solids don't flow.

A box of books weighing 328 N moves witha constant velocity across the floor when it is
pushed with a force of 378 N exerted downward at an angle of 25.6◦ below the horizontal.
Find µk between the box and the floor.

Answers

Answer:

Approximately $0.694$ , assuming that the floor is level.

Explanation:

Between two surfaces that are moving relative to one another, the coefficient of kinetic friction $\mu_(k)$ is equal to the ratio between friction and normal force.

Since the box in this question is moving at a constant speed, the box would be in a translational equilibrium. Forces on this box should be balanced in both the horizontal component and the vertical component.

The value of $\mu_(k)$ in this question can be found in the following steps:

Decompose the external force into horizontal and vertical components.
Balance forces in the horizontal direction to obtain an expression for the friction on this object.
Balance forces in the vertical direction to find an expression for the normal force on this object.
Divide the magnitude of friction by the magnitude of the normal force to find the coefficient of kinetic friction, $\mu_(k)$ .

At an angle of $\theta = 25.6^(\circ)$ from the horizontal, magnitude of the vertical and horizontal components of the external force would be:

Horizontal component: $F\, \cos(\theta) = (378\; {\rm N})\, \cos(25.6^(\circ))$ .
Vertical component: $F\, \sin(\theta) = (378\; {\rm N})\, \sin(25.6^(\circ))$ .

Assume that the floor is level. Forces on this object in the horizontal direction would include:

Horizontal component of the external force, pointing in the direction of motion.
Friction from the ground, pointing backward opposite to the direction of motion.

Forces on this object are balanced in the horizontal direction. Hence, the magnitude of friction would be equal to that of the horizontal component of the external force:

$(\text{magnitude of friction}) = F\, \cos(\theta)$ .

Forces on this object in the vertical direction would include:

Weight of this object, pointing downward.
Vertical component of the external force, pointing downward.
Normal force from the ground, pointing upward.

Forces on this object in the vertical direction are also balanced. The magnitude of the normal force (pointing upward) should be equal to the sum of the magnitude of the two forces pointing downward:

$\begin{aligned} & (\text{magnitude of normal force}) \n =\; & (\text{magnitude of weight}) + F\, \sin(\theta)\end{aligned}$ .

It is given that the magnitude of the weight of this object is $328\; {\rm N}$ . To find the coefficient of kinetic friction, divide the magnitude of friction by the magnitude of the normal force:

$\begin{aligned}\mu_(k) &= \frac{(\text{magnitude of friction})}{(\text{magnitude of normal force})} \n &= \frac{F\, \cos(\theta)}{(\text{magnitude of weight}) + F\, \sin(\theta)} \n &= \frac{(378\; {\rm N})\, \cos(25.6^(\circ))}{(328\; {\rm N}) + (378\; {\rm N})\, \sin(25.6^(\circ))} \n &\approx 0.694\end{aligned}$ .

An object in projectile motion will follow wich path

Answers

It will tend to follow a trajectory path. When a projectile is being flung or flown away by a certain type of force, the trajectory is what it follows through the means of both force and function of time itself. It's also called as flight path.

Which of the following energy sources is expected to have the least growth in the next 20 years?a. hydroelectricity
b. coal
c. natural gas
d. nonhydro renewables

Answers

Answer;

A. hydroelectricity

Explanation;

A nonrenewable resource is a resource of economic value that cannot be readily replaced by natural means on a level equal to its consumption. Most fossil fuels, such as oil, natural gas and coal are considered nonrenewable resources in that their use is not sustainable because their formation takes billions of years.

-Renewable resources are resources which are being continuously consumed by man but are renewed by nature constantly are called as Renewable Resources. These resources are inexhaustible because they cannot be exhausted permanently. Some examples of renewable energy sources are solar energy, wind energy, hydropower, geothermal energy, and biomass energy.

Answer:

hydroelectric

Explanation:

i checked and read and lots of people said "coal" but then others said NOT COAL so i guessed and it was right

A small 175-g ball on the end of a light string is revolving uniformly on a frictionless surface in a horizontal circle of diameter 1.0 m. The ball makes 2.0 revolutions every 1.0 s. What are the magnitude and direction of the acceleration of the ball? What's the tension in the string?

Answers

Answer :

Explanation :

It is given that:

mass of the ball, $m=175\ g=0.175\ Kg$

Radius of circle, $r=(diameter)/(2)=0.5\ m$

The ball makes 2.0 revolutions every 1.0 s. So, angular speed is $\omega=4\pi\ radian/sec$

Since, it is moving in circular path so centripetal acceleration will act here.

So, centripetal acceleration $\alpha$ = $m\omega^2r$

$\alpha=0.175\ Kg* (4\pi)^2* 0.5$

So, $\alpha=13.803\ m/s^2$

Hence, the acceleration is $13.803\ m/s^2$ and it is directed towards the center of rotation.

Tension is a force which is given by :

$F=ma$

$F=0.175\ Kg*13.803\ m/s^2$

$F=2.415\ N$

This is the required answer.

For circular motion.

Centripetal acceleration = mv²/r = mω²r

Where v = linear velocity, r = radius = diameter/2 = 1/2 = 0.5m

m = mass = 175g = 0.175kg.

Angular speed, ω = Angle covered / time

   = 2 revolutions / 1 second

   = 2 * 2π radians / 1 second

   = 4π radians / second

Centripetal Acceleration = mω²r = 0.175*(4π)² * 0.5 Use a calculator

   ≈13.817 m/s²

The magnitude of acceleration ≈13.817 m/s² and it is directed towards the center of rotation.

Tension in the string = m*a

   = 0.175*13.817

   = 2.418 N

Fossil fuels currently account for the majority of the world’s energy use because they are A. renewable energy resources. B. distributed evenly throughout the world. C. relatively inexpensive and readily available. D. nonpolluting.

Answers

The answer to your question will be C. because they are very inexpensive and are readily available but they will eventually deplete because we use them faster than they can be produced we use what has been building up.

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