A stone is dropped from the top of a cliff which is 10-m high. What is its velocity when it hits the ground? Sketch the stones position vs time and velocity vs time graphs.
S = displacement
V = final velocity
U = initial velocity
Dawn is trying to find out how much weight she can push across the room. She is really trying to find her
Answer:
Muscular strength
Explanation:
She is testing her strength while pushing the weights
Dawn is trying to figure out how much weight she can push with her strength, or what her maximum pushing force is, across the room. She could do an experiment to find out.
She must first prepare a testing space with a flat, smooth surface to reduce friction. She can then progressively add weights to a cart or other object and use all of her strength to try to push it across the room. She can determine her maximum pushing force by noting the heaviest weight she can move. For a variety of jobs, including moving furniture or participating in physical sports that call for pushing heavy things, this knowledge can be essential.
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A 325 g object attached to a horizontal spring moves in simple harmonic motion with a period of 0.220 s. The total mechanical energy of the spring-mass system is 5.46 J. A. What is the maximum speed of the object (in m/s)?B) Find the force constant of the spring.C) Find the amplitude of the motion.
Answer:
Explanation:
Total mechanical energy = 1/2 m ω²A² where ω is angular frequency and A is amplitude .
Given
1/2 m ω²A² = 5.46
ω²A² = 2 x 5.6 / m
= 2 x 5.6 / .325
= 34.46
ωA = 5.87
maximum speed = ωA = 5.87 m /s
B )
angular frequency = 2π / T , T is period of oscillation .
= 2 x 3.14 / .22
= 28.54 s⁻¹
ω = [tex]\sqrt{\frac{k}{m} }[/tex]
k is force constant and m is mass
[tex]28.54=\sqrt{\frac{k}{.325} }[/tex]
k = 264.72 N/m
C)
ωA = 5.87
28.54 X A = 5.87
A = .2056 m
= 20.56 cm .
A metal wire of resistance R is cut into six equal pieces that are then placed together side by side to form a new cable with a length equal to one-sixth the original length. What is the resistance of this new cable?
Answer:
d ko alam wag puro asa sa app
Juan is making ice tea. When he adds ice to the tea, why does the tea cool down?
Answer: because the ice was cold, and it melted in the tea. So the tea is now cooler.
Explanation:
If the velocity of a pitched ball has a magnitude of 44.5 m/s and the batted ball's velocity is 55.5 m/s in the opposite direction, find the magnitude of the change in momentum of the ball and of the impulse applied to it by the bat. Find the magnitude of the impulse applied to it by the bat?
If the ball remains in contact with the bat for 2.50 ms, find the magnitude of the average force applied by the bat.
Answer:
ΔP = 14.5 Ns
I = 14.5 Ns
ΔF = 5.8 x 10³ N = 5.8 KN
Explanation:
The mass of the ball is given as 0.145 kg in the complete question. So, the change in momentum will be:
ΔP = mv₂ - mv₁
ΔP = m(v₂ - v₁)
where,
ΔP = Change in Momentum = ?
m = mass of ball = 0.145 kg
v₂ = velocity of batted ball = 55.5 m/s
v₁ = velocity of pitched ball = - 44.5 m/s (due to opposite direction)
Therefore,
ΔP = (0.145 kg)(55.5 m/s + 44.5 m/s)
ΔP = 14.5 Ns
The impulse applied to a body is equal to the change in its momentum. Therefore,
Impulse = I = ΔP
I = 14.5 Ns
the average force can be found as:
I = ΔF*t
ΔF = I/t
where,
ΔF = Average Force = ?
t = time of contact = 2.5 ms = 2.5 x 10⁻³ s
Therefore,
ΔF = 14.5 N.s/(2.5 x 10⁻³ s)
ΔF = 5.8 x 10³ N = 5.8 KN
If 3 cups are sitting outside on a hot summer day, which cup will gain the most heat? Cup A starts a little above freezing, Cup B is initially room temperature, and Cup C is just below boiling.
A-Hot
B- Room
C- Cold
D- None, the heat doesn't change
Answer:
c- cold
Explanation:
What's centrifugal force
GOOGLE: Centripetal force is defined as, "the force that is necessary to keep an object moving in a curved path and that is directed inward toward the center of rotation," while centrifugal force is defined as "the apparent force that is felt by an object moving in a curved path that acts outwardly away from the center of
I don't actually know what that is but I hope this helps! Good luck!
You have learned how to create an effective study space in this learning path.
What has been the biggest change you have made in your study space?
Give at least one specific example.
How has the information you have learned (and the possible changes you have made) already been a benefit to you?
Your answer should be at least two complete sentences.
Answer:
Getting comfy but not too comfy
Explaination : Some people work the majority of their lives in sweat pants and a grungy t-shirt; others dress in full business attire before sitting down at the desk in their study. Because I want to enjoy the place where I study, I say be comfortable—but not too comfortable. I change out of my pajamas before I crack open my books to give my mind another signal that this isn’t lounge time, but study time.
Give one example of a question that science would not be able to test. Then, explain how it could be changed into a testable question. (5 points)
1. What outdoor activities do you prefer? Why? 2. What outdoor activities are you interested in, but have never tried?
The outdoor activities u prefers most is swimming because I feel relaxed after that.
The outdoor activities I am more interested in but I have not tried is mountain climbing.
What is outdoor activities?Outdoor activities refers to exercises or activities that is carried out outside an enclosed areas. These include swimming, mountain climbing, running and the rest.
Therefore, The outdoor activities u prefers most is swimming because I feel relaxed after that.
The outdoor activities I am more interested in but I have not tried is mountain climbing.
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100 Points !!!!!!!! I WILL GIVE BRAINLIEST
Answer: 1. 0.25 m/s squared
2. A = 0.4 m/s^2
3.=20kg. I did this before.
Explanation:
Answer:
Answer: 1. 0.25 m/s squared
2. A = 0.4 m/s^2
3.=20kg.
Explanation:
brainliest? ill answer more of your recent questions!!
Which of the following would NOT be considered vigorous aerobic exercise?
A) Walking
B) Fast-paced aerobic dancing
C) Jogging
D) Indoor cycling
Answer:
A
Explanation:
walking is not particularly vigorous
A spring of spring constant 25 N/m is hung vertically and a 0.300 kg mass is attached to one end, causing a displacement of the end of the spring of _____ m.
Answer:k=1175
Explanation:thank you for asking
Water is formed when two hydrogen atoms bond to an oxegyn atom. When a substance is made of two or more atoms like this we call it
What 4 types of atoms/molecules can you choose from? Which is currently selected?
Answer:
Different Kinds of Atoms
Description. Atoms are made of tiny particles called protons, neutrons and electrons. ...
Stable. Most atoms are stable. ...
Isotopes. Every atom is a chemical element, like hydrogen, iron or chlorine. ...
Radioactive. Some atoms have too many neutrons in the nucleus, which makes them unstable. ...
Ions. ...
Antimatter.
Explanation:
Which of the following substances is a compound?
O A. hydrogen gas
B. nitrogen gas
O c. table sugar
O D. oxygen gas
Table sugar is a compound, it consists of carbon, hydrogen, and oxygen.
Hence, C is the correct answer.
What is the chemical state of matter?The chemical state of matter consists :
ElementCompound andMixturesElement-The substance which contains only one atom and cannot be broken down. Example-Hydrogen.Compound-It is defined as a substance formed when two or more chemical elements are chemically bonded together. The substance can be pure or impure.Mixture-It contains two or more elements or compounds, but they are not chemically combined. Mixtures are of two types :Homogeneous mixture and,Heterogeneous mixtureHence, table sugar is a compound because it is formed by more than 2 chemical elements, and they are chemically bonded together.
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Three polarizing filters are shown in the figure below. The alignment of each filterâs transmission axis is shown, as measured from the vertical. Show calculations to justify all of your answers.Angles: 0, 70, and 90a. Unpolarized light, with an intensity I0 passes through the three filters. What is the intensity of the transmitted light?b. Vertically polarized light, with an intensity I0 passes through the three filters. What is the intensity of the transmitted light?c. Is it possible to remove a polarizer from this collection of filters so that unpolarized light transmitted from the left is not transmitted at all? If so, which filter?
Answer: B.
Explanation:
Hope help :p
A) The intensity of the transmitted light will depend on the angle between the polarization direction of the incident light and the transmission axis of each filter.
B) The intensity of the transmitted light will be equal to the initial intensity, I0.
C) The filter that blocks light vibrating perpendicular to its transmission axis is typically called a "crossed" polarizer.
Polarizing filters are optical devices that allow light waves vibrating in a specific direction to pass through while blocking or attenuating light waves vibrating in other directions. The alignment of a polarizing filter's transmission axis refers to the direction in which it allows light to pass through with maximum intensity.
a. Unpolarized light passing through a polarizing filter will have its intensity reduced by a factor called the transmittance, which depends on the angle between the polarization direction of the incident light and the transmission axis of the filter. If the incident light is unpolarized, it contains an equal distribution of light waves vibrating in all possible directions.
As a result, when unpolarized light passes through a polarizing filter, only the component of light vibrating parallel to the transmission axis will be transmitted, while the perpendicular components will be blocked. Therefore, the intensity of the transmitted light will depend on the angle between the polarization direction of the incident light and the transmission axis of each filter.
b. Vertically polarized light has its electric field oscillating only in the vertical direction. When vertically polarized light passes through a polarizing filter whose transmission axis is aligned with the vertical direction, it will pass through with maximum intensity. Therefore, the intensity of the transmitted light will be equal to the initial intensity, I0.
c. In general, if you have a collection of polarizing filters with different transmission axes, it is possible to remove a polarizer so that unpolarized light transmitted from the left is not transmitted at all. This can be achieved by removing the filter whose transmission axis is perpendicular to the direction of polarization of the incident light. The filter that blocks light vibrating perpendicular to its transmission axis is typically called a "crossed" polarizer.
Specific calculations and analysis of the figure you provided would require more detailed information, such as the transmittance characteristics of each filter at different angles. Without the figure or additional data, it is not possible to provide precise calculations or identify the exact filter that should be removed to block unpolarized light.
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A 200 W light bulb connected across a 110 V dc power supply. (A) What current will flow through this bulb? (B) What is the resistance of the light bulb?
Answer:
I=1.8amps
R=60.5ohms
Explanation:
Step one:
given data
power = 200W
voltage = 110v
. (A) What current will flow through this bulb
we know that the formula relating power, current and voltage is
P=IV
I=P/V
I=200/110
I=1.8amps
(B) What is the resistance of the light bulb?
we know that the formula relating resistance power and voltage is
[tex]P=\frac{V^2}{R}[/tex]
substituting our data we have
[tex]200=\frac{110^2}{R}\\\\[/tex]
cross multiply we have
[tex]200*R=110^2\\\\200*R=12100\\[/tex]
divide both sides by 200
we have
R=12100/200
R=60.5ohms
(A) The current will flow through this bulb will be 1.8amps
(B) The resistance of the light bulb will be 60.5ohms.
What is resistance?Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.
The given data in the problem is;
P is the power= 200 W
V is the voltage= 110 V
I is the current
R is the resistance
(A) The current will flow through this bulb will be 1.8amps
The relationship between the power and the voltage is given by;
[tex]\rm P=IV\\\\\ I=\frac{P}{V} \\\\ I=\frac{200}{110} \\\\\ I=1.8amps[/tex]
Hence the current will flow through this bulb will be 1.8amps
(B) The resistance of the light bulb will be 60.5ohms.
The relationship between the power and the resistance is given by;
[tex]\rm P= \frac{V^2}{R} \\\\ \rm R= \frac{V^2}{P} \\\\ \rm R= \frac{(110)^2}{200} \\\\ \rm R=60.5 \ ohm[/tex]
Hence he resistance of the light bulb will be 60.5ohms.
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Which of the following best explains how earth is heated through radiation
Answer:
The sun touches earth during daytime and the suns rays heat our earth giving us heat. The sun heating the earth is also considered radiation.
Explanation:
Data supporting the theory of a round earth was collected as early as _____.
1570 AD by Galileo
1500 AD by Copernicus
250 BC by Aristarchus
1640 AD by Kepler
250 BC by Aristarchus is the answer ot the question
Data supporting the theory of a round earth was collected as early as _____.
1570 AD by Galileo
1500 AD by Copernicus
250 BC by Aristarchus
1640 AD by Kepler
Magnetic resonance imaging needs a magnetic field strength of 1.5 T. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 2.20-mm-diameter superconducting wire.
Required:
What current is needed?
Answer:
The current needed is 2625.72 A.
Explanation:
Given;
magnetic field strength, B = 1.5 T
length of the solenoid, L = 1.8 m
diameter of the solenoid, d = 75 cm
The number of turns is given by;
[tex]N = \frac{Length \ of solenoid }{diameter \ of wire}\\\\N = \frac{1.8}{2.2*10^{-3}} = 818.18 \ turns[/tex]
The magnetic field is given by;
[tex]B = \frac{\mu_o NI}{l}[/tex]
where;
I is the current needed
[tex]I = \frac{Bl}{\mu_o N} \\\\I = \frac{(1.5)(1.8)}{(4\pi*10^{-7})(818.18)} \\\\I = 2625.72 \ A[/tex]
Therefore, the current needed is 2625.72 A.
two physical quantities that change with temperature
Answer:
i think this is wat u want
In a pig caller can produce a sound intensity level of 107 dB. How many pig callers would be needed to generate an intensity level of 120 dB, assuming each caller can individually produce a sound intensity level of 107 dB
Answer:
20 pig callers
Explanation:
Given that:
A pig caller produced intensity level of a sound = 107 dB
To find how many pig callers required to generate an intensity level of 120 dB;
we have:
120 dB - 107 dB = 13 dB
Taking the logarithm function;
[tex]10 \ log \bigg(\dfrac{I}{I_o} \bigg) = 13 \ dB[/tex]
where;
[tex]I_o[/tex] = initial intensity
[tex]log \bigg(\dfrac{I}{I_o} \bigg) = 1.3[/tex]
[tex]\dfrac{I}{I_o}= 10^{1.3 }[/tex]
I = 19.95[tex]I_o[/tex]
I ≅ 20 pig callers
Consider a converging lens with a focal point . Without changing the shape and size of the lens, what could you do to move the focus closer to the lens?a. Make the lens from a material with a larger index of refraction.b. There is nothing you can do: the shape alone determines the focal length. c. Make the lens from a material with a smaller index of refraction.
Answer:
the correct one is A
Explanation:
The focal length of a lens is given
1 / f = (n-1) (1 /R₁ - 1 /R₂)
where n is the refractive index of the lens and R₁ and R₂ the radii of curvature of the two surfaces.
In our case they indicate that the shape of the lens has not changed, therefore the radii R₁ and R₂ remain constant.
Therefore, the only way to change the focal length is to change the refractive index and as we see the two quantities are inverse, that is, to decrease the focal length we must increase the refractive index
When examining the answers the correct one is A
A force of 30 N is applied tangentially to the rim of a solid disk of radius 0.10 m. The disk rotates about an axis through its center and perpendicular to its face with a constant angular acceleration of 150 rad/s^2. Determine the mass of the disk.
Answer:
m = 4.0 Kg
Explanation:
Using an analogy with the Newton's 2nd law for point masses, for rigid bodies, the external net torque on a rigid body, is equal to its rotational inertia (I), times the angular acceleration (α) of the body, as follows:[tex]\tau_{ext} = I* \alpha (1)[/tex]
Since the magnitude of the torque is the product of the value of the force times the perpendicular distance between the line of action of the force and the axis of rotation, and the force is tangential to the rim of the disk, we can write the following expression:[tex]\tau = F*r*sin 90 = F*r (2)[/tex]
For a solid disk, the rotational inertia regarding an axis through its center, and perpendicular to its face is as follows:[tex]I = \frac{m*r^{2}}{2} (3)[/tex]
Replacing (3) in (1), and (2) in the left side of (1) also, we can solve for m, as follows:[tex]m = \frac{2*30.0N}{0.1m*150(1/s2)} = 4.0 Kg (4)[/tex]
So, the mass of the disk is 4.0 Kg.A tennis ball is thrown against a vertical concrete wall that is fixed to the ground. The ball bounces off the wall. How does the force exerted by the ball on the wall compare with the force exerted by the wall on the ball
А The force exerted by the ball is greater
B The forces exerted by the ball and the wall have the same magnitude.
C. The force exerted by the ball is smaller
D The relative magnitudes of the forces cannot be determined without knowing how long the ball and the wall are in contact
Answer:
The forces exerted by the ball and the wall have the same magnitude
Explanation:
Newton's Third Law Dictates Such
When a tennis ball is thrown against a vertical concrete wall that is fixed to the ground. The ball bounces off the wall because the forces exerted by the ball and the wall have the same magnitude but are opposite in direction, therefore the correct answer is option B.
What is Newton's third law of motion?Newton's third law of motion explains that forces exist in pairs. It states that for every action force there exists equal and opposite reaction forces, these pairs of forces are equal in magnitude but opposite in direction.
As given in the problem when a tennis ball is launched up against a fixed-to-the-ground vertical concrete wall.
Because the forces being applied by the ball and the wall are equal in magnitude but directed differently, the ball bounces off the wall.
Thus, the correct answer is option B.
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what are electromagnetic waves?
please i need a good answer
Answer:
In physics, electromagnetic radiation refers to the waves of the electromagnetic field, propagating through space, carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays.
Explanation:
Jeff was riding in a car with a textbook sitting on the seat beside him. When would the textbook demonstrate the GREATEST effect of inertia?
А
When the car makes a sudden stop,
B
When the car changes into another lane.
С
When the car slows down gradually.
D
When the car runs out of gas and rolls to a stop
What is the acceleration of a proton moving with a speed of 6.5 m/s at right angles to a magnetic field of 1.5 T?
Answer:
The acceleration of the proton is 9.353 x 10⁸ m/s²
Explanation:
Given;
speed of the proton, u = 6.5 m/s
magnetic field strength, B = 1.5 T
The force of the proton is given by;
F = ma = qvB(sin90°)
ma = qvB
where;
m is mass of the proton, = 1.67 x 10⁻²⁷ kg
charge of the proton, q = 1.602 x 10⁻¹⁹ C
The acceleration of the proton is given by;
[tex]a = \frac{qvB}{m}\\\\a = \frac{(1.602*10^{-19})(6.5)(1.5)}{1.67*10^{-27}}\\\\a = 9.353*10^8 \ m/s^2[/tex]
Therefore, the acceleration of the proton is 9.353 x 10⁸ m/s²