Answer:
oven mitt covering your hand (figure 70.27). This is an example of rapid heat transfer by the heating of a solid, the oven mitt.
Explanation:
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If a substance containing neutral atoms can be compressed a lot so that the atoms move closer together and the space between them decreases substantially, the substance is most likely a gas. solid. liquid. plasma.
Answer: gas
Explanation:
.
How would sound be affected if there was no matter to vibrate?
A) The sound would have a higher pitch.
B) There would be no sound.
C) The sound would be louder.
D)The sound would have a lower pitch.
(HELPPPP ASAP!!)
Sound would be affected if there was no matter to vibrate, and there would be no sound.
option B is the correct answer.
What is mechanical wave?
Mechanical wave is a type of wave that requires material medium for its propagation.
That is, for mechanical wave to be effective, there must be a material medium for its propagation.
The examples of mechanical wave include the following;
water waves, sound waves, and seismic waves.The above mentioned examples of mechanical wave requires material medium for their propagation.
Thus, a sound wave which is an example of mechanical wave will be affected in the absence of material medium for their propagation.
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An egg is dropped from a treehouse and takes 1.51.51, point, 5 seconds to reach the ground. We can ignore air resistance.
What is the egg's displacement?
An egg is dropped from a treehouse and takes 5 seconds to reach the ground. We can ignore air resistance. The egg's displacement will be 122.5 m
The branch of physics that defines motion with respect to space and time, ignoring the cause of that motion, is known as kinematics. Kinematics equations are a set of equations that can derive an unknown aspect of a body’s motion if the other aspects are provided.
Using equation of kinematics
v = u - g*t
v = - 9.8 * 5 = 49 m/s
2as = [tex]v^{2} - u^{2}[/tex]
2 * (-g) * s = [tex]v^{2} - u^{2}[/tex]
2 * 9.8 * s = [tex](49)^{2}[/tex] - 0
s = 122.5 m
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after the switch is closed for a long time it is opened. what is the current through r1 immediately after the switch is opened?
The current through R1 immediately after the switch is opened which has been closed for a long time is 0.5 A ( up )
Vc = V30Ω + V10Ω
Vc = I R2
Vc = Voltage across capacitor
V30Ω = Voltage across 30Ω resistor
V10Ω = Voltage across 10Ω resistor
I = Current
R2 = Resistance across resistor 2
I = 2 A
R2 = 10 Ω
Vc = 2 * 10
Vc = 20Ω
V = I R
V30Ω = 30 I
V10Ω = 10 I
Vc = V30Ω + V10Ω
20 = 30 I + 10 I
20 = 40 I
I = 1 / 2
I = 0.5 A ( up )
Therefore, the current through R1 immediately after the switch is opened is 0.5 A ( up )
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a flywheel, initially at rest, has a constant angular acceleration. after 9 s the flywheel has rotated 450 rad. its angular acceleration in rad/s2 is:
A flywheel, initially at rest, has a constant angular acceleration. after 9 s the flywheel has rotated 450 rad . Its angular acceleration in rad/s2 is 11.11 [tex]rad/s^{2}[/tex]
theta = u*t + 1/2 * α * [tex]t^{2}[/tex]
450 = 0 + 1/2 * α * [tex](9)^{2}[/tex] (initially the flywheel is at rest , u =0)
α = 450 / 81
= 11.11 [tex]rad/s^{2}[/tex]
Its angular acceleration in rad/s2 is 11.11 [tex]rad/s^{2}[/tex]
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g a car is being driven at a rate of 40 ft/sec when the brakes are applied. the car decelerates at a constant rate of 19 ft/sec2. how long before the car stops? round your answer to one decimal place.
The car stops after travelling a distance 42.1 ft.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction is displacement.
Given parameters:
Initial velocity of the car; u = 40 ft/sec.
Final velocity of the car; v = 0 ft/sec.
Deceleration of the car; a = 19 ft/sec².
We have to find, distance travelled by the car before stops; d = ?
For decelerated motion, we know that;
v² = u² - 2as
Putting all values, we get;
0² = 40² - 2×19×s
⇒ s = (40×40)/(2×19)
= 42.1 ft.
Hence, distance travelled by the car before stops is 42.1 ft.
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What’s the four-letter type of adapter that’s used with electrical devices that require power but do not contain internal components to derive the required voltage and power from mains power?.
AC Adapters the four-letter type of adapter that’s used with electrical devices that require power but do not contain internal components to derive the required voltage and power from mains power.
Mobile phones, laptop computers, and external hard drives are just a few of the everyday electronic gadgets that can be powered or recharged using alternating current (AC) adapters. An AC adapter converts AC power from an outlet into the voltage or kind of power that is required by an electronic device.
An AC adapter is an external power source that transforms the direct current (DC) required by an electronic device from the alternating current (AC) found in a wall outlet. It is an AC/DC converter as a result. It's also accurate to call it a charger when it powers a battery-operated item.
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what is a positive persuasive effect? how do you maximize positive persuasive effects? what is a negative persuasive effect (reference boomerang effect in your answer)?
The positive persuasive effect is the good thing happening on the wrong path
Positive persuasion can be maximized by changing the attitude.
The negative persuasive effect is that bad thing happens on the wrong path
The persuasion effect should shape consumer attitudes and evaluations of a product and ultimately influence their purchasing decisions.
But positive effects show good things that can happen when people take a course of action or go down the wrong path. Negative persuasive arguments show the bad things that can happen when people don't follow a certain course of action or do something wrong. These are the types of persuasive effects
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how is the period of time during which the marble is being flicked completely different from the rest of the trip?
The marble is being flicked during a very short period of time compared to the rest of the trip. The marble is accelerating during this time, so its velocity is changing. The rest of the trip, the marble is not accelerating, so its velocity is constant
What is the marble's velocity?
The marble's velocity might vary from 3 m/s to 9 m/s.The length and speed of a marble's motion are measured after that, using the formula Speed = Distance / Time to determine their speed.The marble travels at its fastest speed just before it lands because that is when its potential energy changes the most, while other factors have lost the least energy up to that point.To learn more about marble velocity, follow the link https://brainly.com/question/16978117
The 75 kg girl is standing on a platform 15 m above the top of the launcher.
Calculate the gravitational potential energy of the girl relative to the top of the launcher. Show your calculations and include units in
your answer.
The girl steps off the platform and lands on the launcher.
Answer:
11250
Explanation:
E=mgh=75*10*15=11250
6. A Saturn V rocket is launched straight up with a constant acceleration of 18 m/s².
After 150 secs. (a) how fast is the rocket moving and (b) how far has it traveled?
Answer:
below
Explanation:
vf = at = 18 (150) = 2700 m/s
d = 1/2 a t^2 = 1/2 ( 18)(150^2) = 202.5 km
What potential difference is needed to make a current of 5 a flow through a material with resistance of 2 ohms?.
The potential difference needed to make a current of 5 A flow through a material with resistance of 2 ohms is 10 volts.
Potential difference also known as voltage is defined as the work required per unit charge to move a test charge between two points.
The SI unit of potential difference is Volt (V)According to the ohms law voltage is directly proportional to the current, i.e. voltage is equal to the product of current and resistance.
Mathematically, V = IR
Current = 5 A
Resistance = 2 ohms
Voltage = I *R
V = 2 * 5
V = 10 volts
The potential difference is needed to make a current of 5 a flow through a material with resistance of 2 ohms is 10 volts.
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Training intensity determines the specific adaptations that occur in response to the training stimulus. As training intensity increases, training volume must be reduced, and vice versa.
Increased intensity throughout a workout, whether it be aerobic or anaerobic, improves insulin sensitivity, raises lactate threshold, and accomplishes a number of other benefits.
What level of exercise do you do?A person's level of effort during exercise in relation to their maximum effort is referred to as training intensity.Determines how hard a person works out when lifting weights is: Maximum lifts in number. maximal lifts, number of sets, and duration of the session. zone of interestYour heart rate An objective measurement of workout intensity is your heart rate. Exercise intensity is typically inversely correlated with heart rate during physical activity.Increased intensity throughout a workout, whether it be aerobic or anaerobic, improves insulin sensitivity, raises lactate threshold, and accomplishes a number of other benefits. Athletic performance will improve and weight loss will be more effective and efficient.To learn more about Training intensity refer to:
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What is determined by the distance at which the lowest potential energy is achieved and the distance at which positive charges have the least repulsion?.
The positive charges in the two nuclei start to repel one another as the atoms get closer to one another, which raises the potential energy.
The distance at which the lowest potential energy is attained determines the bond length.The number of bound electrons determines the bond's length (the bond order). The greater the attraction between the two atoms and the shorter the bond length are, the higher the bond order. The sum of the covalent radii of the two atoms is typically how long the connection between them is.The diagram shows how the potential energy of the system drops as the atoms first start to interact because the attractive attraction outweighs the repulsive force. Keep in mind that the system's stability increases as potential energy decreases.To know more about positive charge
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