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)
3. Which of the following units is the SI unit of velocity? (1pt.)
a. meter
c. meter per second
b. meter second
d. second per meter
Answer:
c.meter per second is the answer
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:
1. Suppose you're working at a constant temperature , when you exert more pressure on an object
its volume would
(1 Point)
Increase
Decrease
Stay the same
Answer:
Decrease
Explanation:
Working at a constant temperature when more pressure is exerted, the volume decreases.
This is known as Boyle's law.
According to Boyle's law;
"the volume of a fixed mass of a gas varies inversely as the pressure changes, if the temperature is constant".
Mathematically;
P₁V₁ = P₂V₂
P and V are pressure and volume
1 and 2 are initial and final states.
A car goes up an incline that makes an angle of 20 degrees with the horizontal. If the car has a mass of 1600 kg, and the engine is capable of generating 32000 W of usable power, what is the maximum velocity the car can go at? Take the acceleration of gravity to be 9.81 ms2.
Answer:
V = 5.96 m/s
Explanation:
First we find the force required to move the car up the inclined plane. This force shall be equal to the component of the weight of the car that is parallel to the inclined plane. Hence,
F = W Sin θ
F = mg Sin θ
where,
F = Force = ?
m = mass of car = 1600 kg
g = 9.8 m/s²
θ = Inclination Angle = 20°
Therefore,
F = (1600 kg)(9.8 m/s²) Sin 20°
F = 5362.87 N
Now, we use power formula:
P = FV
V = P/F
where,
P = Engine Power = 32000 W
V = Maximum Velocity of Car = ?
Therefore,
V = 32000 W/5362.87 N
V = 5.96 m/s
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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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
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
What is gravity?
Gravity is a force that pushes objects away from each other.
Gravity is a non-contact attractive force between objects in the universe.
Gravity is a contact force between objects in the universe.
Gravity is the speed at which things move in the universe
Answer:
hiii
Explanation:
but u have already given the answer along with the question
Answer:
Gravity is a contact force between objects in the universe
Explanation:
Gravity doesn't repel objects, it pulls them closer.
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
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 .
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!
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.
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:
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!!
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:
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
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
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.
Learn more about outdoor activities below.
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figure 2 shows a charged ball of mass m = 1.0 g and charage q = -24*10^-8 c suspended by massless string in the presence of a uniform electric field E , in this field the ball is in equilibrium at theta = 37 , calculate the magnitude of the electric field E
Answer:
E = 307667 N/C
Explanation:
Since the object's mass is 1 g, then its weight in newtons is 0.001 * 9.8 = 0.0098 N.
This weight should have the same magnitude of the vertical component of the tension T of the string (T * cos(37)) so we can find the magnitude of the tension T via:
0.0098 N = T * cos(37)
then T = 0.0098/cos(37) N = 0.01227 N
Knowing the tension's magnitude, we can find its horizontal component:
T * sin(37) = 0.007384 N
and now we can obtain the value of the electric field since we know the charge of the ball to be: -2.4 * 10^(-8) C:
0.007384 N = E * 2.4 * 10^(-8) C
Then E = 0.007384/2.4 * 10^(-8) N/C
E = 307667 N/C
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
2. When things happen the force is said to be ————.
Calculate the Torque that a child must apply to swing a rock of mass 0.4 kg in a radius 0.91 meters. From rest to a final linear velocity of 6 m/s in 3 seconds.
Answer:
who you ganna throw that rock at child
Explanation:
A circular copper loop is placed perpendicular to a uniform magnetic field of 0.75 T. Due to external forces, the area of the loop decreases at a rate of 7.26 × 10^–3 m^2 /s. Determine the induced emf in the loop.
Answer:
3.63×20^-3V
Explanation:
circular copper loop is placed perpendicular to a uniform magnetic field of 0.75 T. Due to external forces, the area of the loop decreases at a rate of 7.26 × 10^–3 m^2 /s. Determine the induced emf in the loop.
From Faraday-Newmann-Lenz law, the induced emf in the loop is given b
e=- Δθ/Δl
Δθ/Δl= rate of variation of the magnetic flux through the loop.
magnetic flux through the loop = BA
B = magnetic field
A i=area of the loop.
symbol: Φ
Since the magnetic field is constant, the variation of flux can be writing as
e=- B ΔA/Δt
=7.26 × 10^–3 m^2 /s × 0.5T
=3.63×20^-3V
Answer:
5.4E-3 V
Explanation:
EMF = BA
EMF = (0.75)(7.26E-3)
EMF = 0.005445 V
EMF = 5.4E-3 V
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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two physical quantities that change with temperature
Answer:
i think this is wat u want
What is the magnitude of the total acceleration of the tip of a 1.20-m airplane propeller that is moving with an angular speed of 35.0 rad/s and undergoing an angular acceleration of 11.0 rad/s2?
a. 138 m/s2
b. 42 m/s2
c. 145 m/s2
d. 151 m/s^2
Answer:
a = 13.2 m / s²
Explanation:
For this exercise let's use that the angular and linear variables are related
they relate it linearly
a = α r
a = 11.0 1.20
a = 13.2 m / s²
the centripetal related
ac = r w²
ac = 1.20 35²
ac = 1470 m / s²
we can see that the answers are not close to the real answer
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.
Satellites moving at a high speed stay in orbit because
their inertia continuously steers them around Earth
gravity cannot act on objects traveling above a certain speed
Earth's surface curves away as gravity pulls them toward Earth
the force of gravity keeps satellites moving at a constant velocity
Answer:
1st one,
Due to inertia it tries to move in straight line, but space is curved because of earth
Answer:
Earth's surface curves away as gravity pulls them toward Earth
Explanation:
Your Welcome (; (:
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: