Answer: Collegiate and professional football games are 60 minutes long, divided into four quarters of 15 minutes each. In high school football, 12 minute quarters are usually played. The clock is stopped frequently, however, with the result that a typical college or professional game can exceed three hours in duration.
Explanation: You're very welcome ^^
Fred spends most Sunday afternoons watching pro football games and consuming large quantities of
food. What effect does this practice have upon his inertia? Explain.
I
Answer:
His inertia increases.
Explanation:
Inertia is defined as the force which keeps stationary objects to stay still (remain at rest) or moving objects in motion at the same speed and in the same direction unless it is stopped by an external force. It can also be defined as the resistance of an object to resist change by remaining in its state of rest or in motion. Therefore, his inertia increases.
Only about 50% of the solar energy directed toward Earth penetrates directly to the surface. Explain what happens to the rest of the radiation.
Answer:
it is absorbed or reflected by the atmosphere
Explanation:
In the case when approx 50% only of the solar energy would be directed towards earth and it would be penetrates directly to the surface so the rest or remaining of the radiation would be either absorbed or refected by the atmosphere
So as per the given situation the above represent the answer
hence, the same is to be considered and relevant
HELP I'M LAZY AND D U M B
(please use information from the small text to answer the questions)
1. What do the curved blue lines wrapping around Earth represent?
2. The geomagnetic poles move over time. What causes this to happen?
3. How do Earth's geomagnetic poles differ from its geomagnetic poles?
4. Mars has a week magnetic field. How do you think the conditions on the surface of Mars compare with those on Earth? What would that mean for astronauts traveling to Mars in the future?
Maps can convey a lot of different types of information. They can tell you where you are or they can tell you something about a location. Earth scientists often use maps that have coordinates so that they can locate themselves or the features they are interested in. Different types of maps show different things well. For example, some types of maps show the tropical areas really well but do a terrible job depicting the polar regions.
Everyone experiences a wide range of emotions, but when could they indicate a mental disorder?
Answer:
Excessive paranoia, worry, or anxiety.
Long-lasting sadness or irritability.
Extreme changes in moods.
Social withdrawal.
Dramatic changes in eating or sleeping patter
Explanation:
hope it helps brainliest if right thx :)
What element does the picture represent? (Use the periodic table if you need to) *
(1 Point)
nitrogen
O chlorine
O oxygen
slader How much energy is required to move a 1040 kg object from the Earth's surface to an altitude four times the Earth's radius
Answer:
ΔU = 5.21 × 10^(10) J
Explanation:
We are given;
Mass of object; m = 1040 kg
To solve this, we will use the formula for potential energy which is;
U = -GMm/r
But we are told we want to move the object from the Earth's surface to an altitude four times the Earth's radius.
Thus;
ΔU = -GMm((1/r_f) - (1/r_i))
Where;
M is mass of earth = 5.98 × 10^(24) kg
r_f is final radius
r_i is initial radius
G is gravitational constant = 6.67 × 10^(-11) N.m²/kg²
Since, it's moving to altitude four times the Earth's radius, it means that;
r_i = R_e
r_f = R_e + 4R_e = 5R_e
Where R_e is radius of earth = 6371 × 10³ m
Thus;
ΔU = -6.67 × 10^(-11) × 5.98 × 10^(24)
× 1040((1/(5 × 6371 × 10³)) - (1/(6371 × 10³))
ΔU = 5.21 × 10^(10) J
Mass varies depending on where the object is located.
True or false
A pendulum consists of a 2.0 kg stone swinging on a4.0 m string of negligible mass. The stone has a speed of 8.0 m/swhen it passes its lowest point. (a) What is the speed when thestring is at 60# to the vertical? (b) What is the greatest angle withthe vertical that the string will
Answer:
a) [tex]v_{60^{o}} =4.98 m/s[/tex]
b) [tex]\theta_{max}=79.34^{o}[/tex]
Explanation:
This problem can be solved by doing an energy analysis on the given situation. So the very first thing we can do in order to solve this is to draw a diagram of the situation. (see attached picture)
So, in an energy analysis, basically you will always have the same amount of energy in any position of the pendulum. (This is in ideal conditions) So in this case:
[tex]K_{lowest}+U_{lowest}=K_{60^{o}}+U_{60^{0}}[/tex]
where K is the kinetic energy and U is the potential energy.
We know the potential energy at the lowest of its trajectory will be zero because it will have a relative height of zero. So the equation simplifies to:
[tex]K_{lowest}=K_{60^{o}}+U_{60^{0}}[/tex]
So now, we can substitute the respective equations for kinetic and potential energy so we get:
[tex]\frac{1}{2}mv_{lowest}^{2}=\frac{1}{2}mv_{60^{o}}^{2}+mgh_{60^{o}}[/tex]
we can divide both sides of the equation into the mass of the pendulum so we get:
[tex]\frac{1}{2}v_{lowest}^{2}=\frac{1}{2}v_{60^{o}}^{2}+gh_{60^{o}}[/tex]
and we can multiply both sides of the equation by 2 to get:
[tex]v_{lowest}^{2}=v_{60^{o}}^{2}+2gh_{60^{o}}[/tex]
so we can solve this for [tex]v_{60^{o}}[/tex]. So we get:
[tex]v_{60^{o}}=\sqrt{v_{lowest}^{2}-2gh_{60^{0}}}[/tex]
so we just need to find the height of the stone when the pendulum is at a 60 degree angle from the vertical. We can do this with the cos function. First, we find the vertical distance from the axis of the pendulum to the height of the stone when the angle is 60°. We will call this distance y. So:
[tex]cos \theta = \frac{y}{4m}[/tex]
so we solve for y to get:
[tex]y = 4cos \theta[/tex]
so we substitute the angle to get:
y=4cos 60°
y=2 m
so now we can find the height of the stone when the angle is 60°
[tex]h_{60^{o}}=4m-2m[/tex]
[tex]h_{60^{o}}=2m [/tex]
So now we can substitute the data in the velocity equation we got before:
[tex]v_{60^{o}}=\sqrt{v_{lowest}^{2}-2gh_{60^{0}}}[/tex]
[tex]v_{60^{o}} = \sqrt{(8 m/s)^{2}-2(9.81 m/s^{2})(2m)}[/tex]
so
[tex]v_{60^{o}}=4.98 m/s [/tex]
b) For part b, we can do an energy analysis again to figure out what the height of the stone is at its maximum height, so we get.
[tex]K_{lowest}+U_{lowest}=K_{max}+U_{max}[/tex]
In this case, we know that [tex]U_{lowest}[/tex] will be zero and [tex]K_{max}[/tex] will be zero as well since at the maximum point, the velocity will be zero.
So this simplifies our equation.
[tex]K_{lowest} =U_{max}[/tex]
And now we substitute for the respective kinetic energy and potential energy equations.
[tex]\frac{1}{2}mv_{lowest}^{2}=mgh_{max}[/tex]
again, we can divide both sides of the equation into the mass, so we get:
[tex]\frac{1}{2}v_{lowest}^{2}=gh_{max}[/tex]
and solve for the height:
[tex]h_{max}=\frac{v_{lowest}^{2}}{2g}[/tex]
and substitute:
[tex]h_{max}=\frac{(8m/s)^{2}}{2(9.81 m/s^{2})}[/tex]
to get:
[tex]h_{max}=3.26m[/tex]
This way we can find the distance between the axis and the maximum height to determine the angle of the pendulum about the vertical.
y=4-3.26 = 0.74m
next, we can use the cos function to find the max angle with the vertical.
[tex]cos \theta_{max}= \frac{0.74}{4}[/tex]
[tex]\theta_{max}=cos^{-1}(\frac{0.74}{4})[/tex]
so we get:
[tex]\theta_{max}=79.34^{o}[/tex]
The speed when the string is at 60 degrees to the vertical is approximately 8.85 m/s. The greatest angle with the vertical that the string will make is approximately 57.6 degrees.
(a) To find the speed when the string is at 60 degrees to the vertical, we can apply the conservation of mechanical energy between the lowest point (initial position) and the 60 degrees point (final position).
At the lowest point, all of the gravitational potential energy is converted into kinetic energy:
m × g × h = (1/2) × m × v²
v = √(2 × g × h) = √(2 × 9.8 × 4.0) ≈ 8.85 m/s.
Therefore, the speed when the string is at 60 degrees to the vertical is approximately 8.85 m/s.
(b) The greatest angle with the vertical that the string will make, we need to determine the maximum height reached by the stone. At the highest point, all of the kinetic energy is converted into gravitational potential energy:
(1/2) × m × v² = m × g h(max)
h(max) = (v²) / (2 × g) = (8.0²) / (2 × 9.8) ≈ 3.27 m.
Using the sine function:
sin(Θ) = h(max) / 4.0,
Θ = sin⁻¹(h(max) / 4.0) ≈ sin⁻¹(3.27 / 4.0) ≈ 57.6 degrees.
Therefore, the greatest angle with the vertical that the string will make is approximately 57.6 degrees.
To know more about potential energy:
https://brainly.com/question/24284560
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A book is resting on the table. Forces are exerted _____.
upward by the table
downward by the book
in equal and opposite directions
all of the above
Answer:
downward by the book
Explanation:
because of gravity
“Energy is never created of destroyed, it only transforms from one form to another” is the definition of…
A. The Law of Diminishing Returns
B. The Law of Conservation of Energy
C. The Law of Universal Gravitation
D. The Law of Entropy
Answer:
it is B. The Law of Conservation of Energy
Explanation:
hope this helps
How do scientists classify species?
A. By comparing the ages of individuals
B. By comparing common names
C. By comparing who discovered them
D. By comparing traits
Answer:
D. By comparing traits
Explanation:
Because age isn't genetic, as well as names, as well as who discovered, but traits are genetic.
Answer:
D
Explanation:
A monkey pushes a rock horizontally on a frictionless table with a net force of 10 N for 2.0 m. How much kinetic energy does the rock gain?
Round the answer to two significant digits
Answer:
The answer is 20J
Explanation:
An object on Earth's surface has a mass of 18.7 kg. The object's weight is ________ N.
Answer:
The mass of an object is the same on Earth, in orbit, or on the surface of the Moon. ... the absence of air resistance, all objects fall with the same acceleration g. ... A 1.0-kg mass thus has a weight of 9.8 N on Earth and only about 1.7 N ... What force does he apply if the stone accelerates at a rate of 1.5m/s2?
Explanation:
Pangaea was not the first, nor will it be the last, super continent. In the process of continental drift, sometimes chunks of continents disappear. Describe how this can happen.
Answer:
Explanation:
there could be earthquakes or the tectonic plates under can make it fall apart, natural disasters
hope this helps!!
An LDR was placed near a light source. The following results were
recorded: potential difference = 5.50V current = 12.5 mA. Which equation
links current, potential difference and resistance? *
Answer:
V = 440I
Explanation:
According to ohm's law which states that the current passing through a metallic conductor at constant temperature is directly proportional to the potential difference across its ends.
Let V be the potential difference
I is the current
R is the resistance
Mathematically;
V∝I
V = IR
Given
Potential difference V = 5.50Volts
Current = 12.5mA = 12.5*10^-3A
Current I = 0.0125A
Recall that V = IR
R = V/I
Substitute the given parameters into the formula;
R = 5.50/0.0125
R = 440 ohms
Hence the equation that links current, potential difference and resistance is expressed as;
V = I(440)
V = 440I
Electric field lines can never cross. What would crossed electric field lines indicate?
a field pointing in two directions
an attractive force on a charge
a nonuniform area of the field
a place where the field strength is zero
Answer:
It indicates that a force has 2 directions at the point at which they cross
Answer:
A. A field pointing in two directions
A ______ measurement that both size and direction may be represented by an arrow
Answer:
Vector
Explanat
Vector is the only right answer in the situatuin
What is most likely to happen during deposition?
Answer:
a person appears at a specified time and place and gives sworn testimony
Explanation:
Hope this helps
Microwaves travel at the speed of light, 300,000 km/s. What is the wavelength of a microwave received at 1000 gigahertz?
Answer:
3 x 10⁻⁴m
Explanation:
Given parameters:
Speed of light = 300000km/s
Frequency = 1000gigahz = 1000 x 10⁹Hz
Unknown:
Wavelength = ?
Solution:
To solve this problem, we use the expression below:
V = F ∧
V is the speed
F is the frequency
∧ is the wavelength
300000 = 1000 x 10⁹ x ∧
Wavelength = 3 x 10⁻⁷km = 3 x 10⁻⁴m
SOMEONE HELP PLEASE ASAP ITS TIMED
A boy is slowly pushing a box across the floor. In which direction is friction occurring?
a. away from the boy
b. toward the boy
c. up
d. down
The car has a mass of 22,000Kg. Calculate the force needed to stop the car.
Answer:
Momentum of car = 1200 kg * 10 m/s = 12000 kgm/s Momentum = Force * time 12000 kgm/s = Force * 20s Force = 600 N
Explanation:
the diameter of the moon is _____ that of the earth
answers:
2/3
1/4
1/2
1/3
Answer:
2,158.8 mi?
Explanation:
sorry if this is wrong
Select the correct answer.
The goal of the Tariff of Abominations, passed in 1828, was to protect the industries in the
foreign nations. Which statement best shows the effect of this tariff on American history?
ОА.
The Tariff of Abominations widened Income Inequality because it favored the
ОВ.
The Tariff of Abominations upset American Indians because it did nothing pro
OC.
The Tariff of Abominations caused conflicts between the North and the South
OD
The Tariff of Abominations upset common working class Americans because i
Reset
Next
Answer:
OC, The Tariff of Abominations caused conflicts between the North and the South regarding their sectional interests.
Explanation:
The Tariff of Abominations did cause conflicts because it widened income inequality since it favored the rich upper class while burdening the lower class. The South was the lower class, and the North was more of the upper class.
Weight is the direct result of :
A. Distance
B. The amount of gravity being pulled
1. The resultant force on a ball is not zero. What will happen to the ball? *
(1 Point)
It will move or change direction.
O it will remain stationary.
O it will spin on its axis.
Answer:
it will more and change direction
Explanation:
because the resultant force (R) is not equal zero so may be there is a force greater than the other one and the ball will more in the direction of greater force.
and it can't be remain stationary because R=! 0 .
in an effort to reach the store before it closed the motorist increase the speed of his car from 20 m per second to 60 meters per second over a four second. What was the car's acceleration
Answer:
10
Explanation:
Givens
vi = 20 m/s
vf = 60 m/s
t = 4 second.
Formula
a = (vf - vi) / t
a = (60 - 20)/4
a = 40 / 4
a = 10 m/s^2
WILL GIVE LOTS OF POINTS!!!!!!
Explain the process of convection in the atmosphere.
Answer : Convection is a major factor in weather. The sun heats the earth's surface, then, when cooler air comes into contact with it, the air warms and rises, creating an upward current in the atmosphere. That current can result in wind, clouds, or other weather.
Explanation:
In the atmosphere convection happens when warm air on the ground rises into the atmosphere(clouds) and at the high altitudes the air becomes cold causing the air to come back down to the surface.
A whistle emitting a note of 4 kHz is
whirled in a horizontal circle of radius 1 m at a constant speed. If the highest note heard
by a person a large distance away is 4200 Hz, find:
(i) the speed of the whistle
(ii) the lowest note heard by the person,
(iii) the time taken for the whistle to make on complete revolution,
(iv) the time interval between the person hearing the highest and lowest note.
Answer:
(i) The speed of the whistle is 16.[tex]\overline 3[/tex] m/s
(ii) The lowest note heard by the person is 3,818.[tex]\overline{18}[/tex] Hz
(iii) The time taken for the whistle to make one revolution is approximately 0.38468 seconds
(iv) The time interval between the person hearing the highest and lowest note is approximately 0.19234 seconds
Explanation:
The question relates to the Doppler effect for which the change in frequency is given as follows;
[tex]f_L = \left ( \dfrac{v \pm v_L }{v \pm v_S} \right ) \cdot f_S[/tex]
Where;
[tex]f_L[/tex] = The frequency heard by the listener
v = The speed of sound in air = 343 m/s
[tex]v_L[/tex] = The listener's speed
[tex]v_S[/tex] = The source's (whistle) speed
[tex]f_S[/tex] = The frequency of the source
The given parameters are;
The frequency of the whistle (source), [tex]f_S[/tex] = 4 kHz = 4,000 Hz
The radius of the horizontal circle around which the whistle is whirled = 1 m
The highest note heard by a person a large distance away = 4200 Hz
The distant listener is taken as stationary, [tex]v_L[/tex] = 0 m/s
We therefore have;
[tex]f_L = \left ( \dfrac{v \pm 0 }{v \pm v_S} \right ) \cdot f_S = \left ( \dfrac{v }{v \pm v_S} \right ) \cdot f_S[/tex]
(i) When the whistle's motion while it is being whirled towards the listener, [tex]v_S[/tex] is negative
When the whistle's motion while it is being whirled is away from listener, [tex]v_S[/tex] is positive
The highest note, [tex]f_{LH}[/tex], is obtained with the lowest denominator, that is when the source moves towards the listener and [tex]v_S[/tex] is negative, we get;
[tex]f_{LH} = 4,200 \ Hz = \left ( \dfrac{343 \ m/s }{343 \ m/s - v_S} \right ) \times 4,000 \ Hz[/tex]
[tex]\dfrac{4,200 \ Hz}{4,000 \ Hz} = \dfrac{21}{20} = \dfrac{343 \ m/s}{343 \ m/s - v_S}[/tex]
21·(343 m/s - [tex]v_S[/tex]) = 20×343 m/s
21 × [tex]v_S[/tex] = 21 × 343 m/s - 20 × 343 m/s = 343 m/s
[tex]v_S[/tex] = (343 m/s)/21 = 49/3 m/s = 16.[tex]\overline 3[/tex] m/s
The speed of the source = The speed of the whistle
∴ The speed of the source = [tex]v_S[/tex] = 16.[tex]\overline 3[/tex] m/s = The speed of the whistle
(ii) The lowest note heard by the person occurs when the denominator of the formula for the change in frequency is smallest for which we have the value of [tex]v_S[/tex] as positive and the source moves away from the observer which is presented as follows;
[tex]f_{LH} = \left ( \dfrac{343 \ m/s }{343 \ m/s +16.\overline 3 \ m/s } \right ) \times 4,000 \ Hz = 3,818.\overline {18} \ Hz[/tex]
The lowest note heard by the person = 3,818.[tex]\overline{18}[/tex] Hz
(iii) The angular velocity of the whistle, ω is given as follows;
[tex]\omega = \dfrac{\theta}{t} = \dfrac{v_S}{r} = \dfrac{16. \overline 3 \ m/s}{1 \ m} = 16. \overline 3 \ radians/second[/tex]
The angle rotated in one revolution, is 2·π radians, therefore, when θ = 2·π radians, the time, [tex]t_c[/tex], to complete one revolution is given as follows;
[tex]t_c = \dfrac{\theta}{\omega} = \dfrac{2 \times \pi \ radians}{16. \overline 3 \ radians/second} \approx 0.385 \ seconds[/tex]
Therefore, the time to complete one revolution ≈ 0.38468 seconds
(iv) The time interval between the person hearing the highest and lowest note is the time to complete half a cycle ≈ 0.38468/2 seconds ≈ 0.19234 seconds.
Atom X has an atomic number of 10. Atom Y has an atomic number of 4. All of these statements about atoms X and Y are correct except
A . atom X has 8 valence electrons
B. atom Y is less reactive than atom X
C. atom Y has 2 valence electrons
D atom X has the same number of energy levels as atom Y
Item 1 Circuit A has a resistance of 7.5 ohms, and circuit B has a resistance of 5 ohms. Which statement about the circuits must be correct? (1 point) Item 2 Item 3 If the current in circuit A is less than the current in circuit B, then the voltage in circuit A is less than the voltage in circuit B. Item 4 If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B. If the current in circuit A is equal to the current in circuit B, then the voltage in circuit A is less than the voltage in circuit B. If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is equal to the current in circuit B. 0 Type here to search е c
Answer:
e4atetetsgts4tgesetse
Explanation:
ger54ttagcuit B, then the voltage in circuit A is less than the voltage in circuit B. Item 4 If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B. If the current in circuit A is equal to the current in circuit B, then the voltage in circuit A is less than the voltage in circuit B. If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is equal to the current in circuit B. 0 Type here to search е c