Answer:
A, The same amount of gravity
Explanation:
If an object goes through a chemical reaction, but does not change in mass, that object has the same amount of gravity.
What is chemical reaction?A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Chemical reaction include changes in color, temperature, the production of light, changes in odor, and the formation of gases.
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What is the origin of all stars?
supernova
dwarfs
protostars
nebulae
Answer:
Protostars
Explanation:
What is a car’s acceleration if it increases its speed from 5 m/s to 20 m/s in 3 s?
10 m/s 2
15 m/s 2
5 m/s 2
–15 m/s 2
Answer:
5
Explanation:
vf = vi + at
20 = 5 + 3a
3a = 15
a = 5
A lamp is marked 24V, 100W. Describe an experiment to check that the electrical power supplied to the lamp is 100W when the p.d. across it is 24V.
In your account you should
* include a circuit diagram,
* state the readings that are taken,
* show how the result is calculated from the readings.
The electrical power supplied to the lamp is 100W when the p.d. across it is 24V and the current is 4.2 A.
What is electrical power?Electrical power is the rate at which electrical work is done.
The unit of electrical power is Watts.
Power = Current × VoltageThe experiment will require a 24V Battery, a Lamp marked 24V, 100 W, a key, wires, a rheostat, a voltmeter and an ammeter.
The circuit is completed and the rheostat is adjusted to provide until the voltmeter reads 24V.
The ammeter reading is taken as well.
When the voltmeter reading is 24V, it can be seen that' the ammeter reading for current is approximately 4.2 A.
Calculating, the power of the lamp:
Power = 24 × 4.2 = 100 W
Therefore, the electrical power supplied to the lamp is 100W when the p.d. across it is 24V and the current is 4.2 A.
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Jessica is riding on a merry-go-round on an outer horse that sits at a distance
of 8.0 m from the center of the ride. Jessica's sister, Julie, is on an inner horse
located 6.0 m from the ride's center. The merry-go-round turns around once
every 40.0 s. a) Explain which girl is moving with the greater linear speed.
b) What is the centripetal acceleration of Julie and her horse?
a. Jessica's has a greater linear speed.
b. The centripetal acceleration of Julie and her horse is 0.148 m/s².
a) Explain which girl is moving with the greater linear speed.Jessica's has a greater linear speed.
To answer the question, we need to know what Linear speed is.
What is linear speed?This is the tangential speed at which an object in circular motion moves. It is given by v = rω where
r = distance of object from center of circle and ω = angular speed.Now, given that Jessica is riding on a merry-go-round on an outer horse that sits at a distance of 8.0 m from the center of the ride and Jessica's sister, Julie, is on an inner horse located 6.0 m from the ride's center. Also, the merry-go-round is moving at constant angular speed.
Since Linear speed v = rω and ω = constant,
So, v ∝ r.
So, the girl with the greater distance from the center of the merry-go-round would have the greater linear speed.
Since
Jessica is at r' = 8.0 m and Julie is at r" = 6.0 m.Since
v ∝ r, and r' = 8.0 m > r" = 6.0 m,So, Jessica's has a greater linear speed.
b) What is the centripetal acceleration of Julie and her horse?The centripetal acceleration of Julie and her horse is 0.148 m/s².
Centripetal acceleration a = rω² where
r = distance of Julie from center of merry-go-round = 6.0 m and ω = angular speed of merry go round.Since the merry-go-round turns once every 40.0 s, we have that ω = 2π/40.0 s
= π/20.0 s
= 0.157 rad/s
Since a = rω²
Substituting the values of the variables into the equation, we have
a = rω²
a = 6.0 m × (0.157 rad/s)²
a = 6.0 m × 0.0247 rad²/s²
a = 0.148 m/s²
So, the centripetal acceleration of Julie and her horse is 0.148 m/s².
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A skydiver is jumping from an airplane that is 1,000 meters above the ground. The diver has a mass of 130 kg. What is the potential energy at this height?
mgh
1/2 mv2
What is the potential energy at this height?
Explanation:
POTENTIAL energy is due to a mass's height above the earth and is equal to m * g * h
130 kg * 9.81 m/s^2 * 1000 m = 1275300 J
When driving on roads that may be slippery: A. Always drive at the maximum speed limit. B. Use cruise control to maintain a steady speed. C. Reduce your following distance. D. Do not make any sudden changes in speed or direction.
When driving on roads that may be slippery, do not make any sudden changes in speed or direction. Option D is correct.
What is a slippery surface?The slick road sign serves as a warning. When the road is wet or ice, drivers should use extra caution and reduce their speed. When the weather is bad, avoid making any rapid changes in direction.
When driving on roads that may be slippery, do not make any sudden changes in speed or direction. It may cause accident because the vehicle can lose their balance.
Hence, option D is correct.
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Without telescopes or other aid, we can look up and see the moon in the night sky because it.
Answer:
because the moon is nearer to the earth compared to the stars which we require telescopes to observe
A roller coaster starts from rest at its highest point and then descends on its (frictionless) track. Its speed is 20 m/s when it reaches ground level. What was its speed when its height was half that of its starting point
Answer:
Approximately [tex]14\; {\rm m\cdot s^{-1}}[/tex].
Explanation:
The gravitational potential energy [tex]\text{GPE}[/tex] of this roller coaster is proportional to the height [tex]h[/tex] of the roller coaster.
The kinetic energy [tex]\text{KE}[/tex] of this roller coaster is proportional to the square of speed [tex]v[/tex].
The question states that the track is frictionless. Thus, during the descent, the [tex]\text{GPE}[/tex] of this roller coaster is turned into [tex]\text{KE}[/tex] without any energy loss.
When the roller coaster was at [tex](1/2)[/tex] of the the initial height, only[tex]1 - (1/2) = (1/2)[/tex] of the original [tex]\text{GPE}[/tex] was turned into [tex]\text{KE}[/tex]. The [tex]\text{KE}\![/tex] of this roller coaster at that height would be [tex]1 - (1/2) = (1/2)\![/tex] of the [tex]\text{KE}\!\![/tex] when the roller coaster is at the ground level.
The [tex]\text{KE}[/tex] of the roller coaster is proportional to [tex]v^{2}[/tex] (the square of speed [tex]v[/tex].) Thus, since the [tex]\text{KE}\![/tex] at [tex](1/2)[/tex] the initial height is [tex]1 - (1/2) = (1/2)\![/tex] the [tex]\text{KE}\!\![/tex] at the ground level, the [tex]v^{2}[/tex] at [tex](1/2)\![/tex] the initial height would also be [tex]1 - (1/2) = (1/2)\![/tex] the [tex]v^{2}\![/tex] at the ground level.
Since [tex]v = 20\; {\rm m\cdot s^{-1}}[/tex] at the ground level, [tex]v^{2} = (20\; {\rm m\cdot s^{-1}})^{2}[/tex] at the ground level. The [tex]v^{2}[/tex] at [tex](1/2)[/tex] the initial height would then be:
[tex](1 - (1/2))\times (20\; {\rm m\cdot s^{-1}})^{2}[/tex].
Thus, the speed [tex]v[/tex] at [tex](1/2)[/tex] the initial height would be:
[tex]\begin{aligned}& \sqrt{(1 - (1/2))\times (20\; {\rm m\cdot s^{-1}})^{2}} \\ =\; & \sqrt{\frac{1}{2} \times (20\; {\rm m\cdot s^{-1}})^{2}} \\ =\; & \sqrt{200}\; {\rm m\cdot s^{-1}} \\ \approx\; & 14\; {\rm m\cdot s^{-1}}\end{aligned}[/tex].
21
The law of universal gravitation can be expressed as
where F is the force of attraction, G is the universal graviational constant (6.674x10-11
N m2 kg-2) m1 is the mass of the first object, m2 is the mass of the second object, and r is th
distance between the centers of the two objects.
A 1.2-kilogram container of sugar sits 2.3 meters away from a 9.4-kilogram bag of flour. Wha
is the gravitational force of attraction between the sugar and the flour?
(4 Points)
mim2
F=G
72
The attractive force between sugar and flour by using Newton's law of gravitation is 14.229 × 10⁻¹¹ N.
What is the Universal law of Gravitation?This law states that every object in the universe attracts each other. The attractive force is directly proportional to the masses of two objects and inversely proportional to the square of the distance between them.
This law is applicable to all the objects with mass in the universe and hence it is called the Universal law of gravitation. It was proposed by Newton.
The attractive force, F =G (m₁×m₂ / r²). m₁,m₂ is the masses of two objects and r is the distance between two masses. G is the gravitational constant and is equal to 6.67×10⁻¹¹Nm²kg⁻².
From the given,
Gravitational constant,G = 6.67×10⁻¹¹Nm²kg⁻²
m₁ (mass of sugar) = 1.2 kg
m₂ (mass of flour) = 9.4 kg
r (distance of separation) = 2.3 m
The attractive force, F = G (m₁×m₂ / r²)
F = 6.67×10⁻¹¹×(1.2×9,4) / (2.3)²
= 14.229 × 10⁻¹¹ N
Thus, the attractive force F = 14.23 × 10⁻¹¹ N.
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A measurement of the hotness or coldness of an object can be defined by its... A. potential energy. B. magnetism. C. chemical potential. D. temperature.
Answer:D
Explanation: temperature is the measure of hotness and coldness of a body.
Q.01 When charging a secondary cell, energy is stored within a dielectric material using an electric field. True or False
True, when charging a secondary cell, energy can be stored within a dielectric material using an electric field.
Relationship between dielectric material and electric field
The electric field in a capacitor separates the negative and positive charges in the dielectric material, this causes an attractive force between each plate and the dielectric.
The dielectric material can store electric energy due to its polarization in the presence of external electric field, which causes the positive charge to store on one electrode and negative charge on the other.
Thus, when charging a secondary cell, energy can be stored within a dielectric material using an electric field.
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_____ is a device
which increases or decreases voltage.
Iron
core
Electricity Primary
Coil
(input)
Secondary Electricity
Coil
in
out
(output)
100 V
10 A
1000 W
static charge
charges
transformer
force field
Primary
55 turns
Secondary
20 turns
Core
400 V
2.5 A
1000 W
Answer:
transformers
Explanation:
A transformer is a device that increases or decreases voltage.
If the strings have different thicknesses, which of the following parameters, if any, will be different in the two strings?.
Answer:
Wave speed and wavelength
Explanation:
Describe how a speed-time graph shows an object that is stationary
Answer:
When in the graph the line is horizontal it states that the moving object is stationary
Explanation:
At 55 mph, how long does it take for a truck to fully stop?.
The time taken by a truck to fully stop will be 2 hours. The time taken is found with the help of Newtons second equation of motion.
What is distance?Distance is a numerical representation of the distance between two objects or locations.
Distance can refer to a physical length or an estimate based on other factors in physics or common use. |AB| is a symbol for the distance between two points A and B.
The given data Is;
u is the velocity of truck = 55 mph
v is the final velocity of truck = 0 mph
S is the distance travelled by the truck before stop= 302 feet
1 feet = 0.000189394 mile
302 feet = 302 × 0.000189394 mile= 0.057197 mile
From the Newtons's second equation of motion;
[tex]\rm v^2 = u^2-2as[/tex]
The formula for the acceleration is found as;.
[tex]a = \frac{v-u}{t}[/tex]
By rearranging the equation, we get;
[tex]\rm u^2 =2as \\\\ u^2 =2[ \frac{v-u}{t}]s \\\\ u = \sqrt{2[ \frac{v-u}{t}]s} \\\\ 55 = \sqrt{2[ \frac{55-0}{t}]} \\\\ 55= \frac{2 \times 55}{t} \\\\ t= 2 \ hour[/tex]
Hence, the time taken by a truck to fully stop will be 2 hours.
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Andrea, whose mass is 48kg, thinks she's sitting at rest in her 5. 0m-long dorm room as she does her physics homework. Within what range is her velocity likely to be?
For Andrea, whose mass is 48kg, thinks she's sitting at rest in her 5. 0m-long, her range is mathematically given as
dv=1.95*10^{-37}ms^{-1}
Within what range is her velocity likely to be?Generally, the equation for the uncertainty principle is mathematically given as
mdxsv=h/2
Therefore
dv=h/(2mdx)
dv=1.054*10^{-39}/2*45*6
dv=1.95*10^{-37}ms^{-1}
In conclusion, range of her velocity
dv=1.95*10^{-37}ms^{-1}
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In what way is a touch screen similar to a CCD? In what way is it different?
If you wanted to decrease the gravitational force between two objects, what would you do?
Question 4 options:
Increase the distance between the two objects.
Decrease the distance between the two objects.
Increase the mass of both of the objects.
Increase the mass of one of the objects.
Answer:
Increase distance
Explanation:
Gravity force = g m1 m2 / r^2
so you can see that increasing the distance r^2 will make the force less
Answer: Increase the distance between the two objects.
Explanation:
Consider what features of objects affect the gravitational force exhibited.
What is the electrical force between q2 and q3? recall that k = 8.99 × 109 n•meters squared over coulombs squared.. 1.0 × 1011 n –1.1 × 1011 n –1.6 × 1011 n 1.8 × 1011 n
The magnitude of the electrical force between q2 and q3 is given as a ratio between the product of their charges and the square of the distance of separation.
What is the magnitude of electrical forces between two charges?The magnitude of the electrical force between two charges refers to the attractive or repulsive forces that exists between two charges separated by a given distance in an electric field.
The magnitude of the electrical force, F between the two charges q2 and q3 is given be my the formula below
[tex]F = \frac{K \times q_2 \times q_3}{d^{2}}[/tex]
Therefore, the magnitude of the electrical force between q2 and q3 is given as a ratio between the product of their charges and the square of the distance of separation.
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Answer:B .–1.1 × 10¹¹ N
Explanation:
Got it right on edge
A greenhouse is an example of a(n) __________________________________. Question 7 options: active solar energy system. biomass generator. passive solar energy system. nonrenewable energy source.
Why does the luminosity of a high-mass star remain nearly constant as the star burns heavy elements in its core, even though it is producing millions of times more energy per second than it did on the main sequence
Distant galaxies we can see today with a redshift of z >> 6 emitted their light when the universe was:
Distant galaxies we can see today with a redshift of z >> 6 emitted their light when the universe was expanding.
What is a Galaxy?This term comprises of stars and interstellar matter that make up the universe.
, The farther a galaxy, the faster it is receding from Earth which depicts its expansion and makes it the most appropriate choice.
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describe the friction of smooth surfaces
When two surfaces slide against each other, a force called friction makes them stick very slightly together. Smooth surfaces, like ice and glass, are easy to slide over. They create very little friction. Rough surfaces like rock and sand create much more friction, and are easy to grip on to.
hope it helps...!!!
Which of these is an example of Newton’s first law of motion?
A. A basketball bounces on the ground with the same force that the ground pushes up on the ball.
B. A person standing on a bus moves backward when the bus suddenly moves forward.
C. A person jumps to a dock from a boat, and the boat moves away from the dock.
D. A baseball hit with a baseball bat travels faster than a bowling ball hit with the same force
Answer:
a baseball hit with a baseball bat travels faster than a bowling ball hit with the same type of force
Explanation:
Maria listed four important points about einstein’s special theory of relativity. 1) applies to any object moving more slowly than the speed of light 2) applies to objects moving in a straight path 3) describes the relationship between time and space 4) applies to uniformly moving objects which best describes how maria can correct her error? change the first point to "applies to objects moving almost at the speed of light." for point 2, include objects moving in a curved path. for point 3, replace the word "space" with the word "motion." change the fourth point to "applies to accelerating objects."
How Maria can correct her error is by changing the fourth point to "applies to accelerating objects.". Option D. This is further explained below.
What is einstein’s special theory of relativity?Generally, Einstein’s special relativity is simply defined as how speed affects matter, time, and space.
In conclusion, The theory contains a method for defining the link between energy and matter using the speed of light.
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How long does it take light to travel from jupiter to earth?.
How will you describe the horizontal and vertical motions of a projectile?
Which describes the movement of a fluid during convection?
Warm and cool fluids rise.
Warm and cool fluids sink.
Warm fluid rises and cool fluid sinks.
Warm fluid sinks and cool fluid rises.
Answer:
warm rises cold sinks
Explanation:
A 200-turn solenoid having a length of 25 cm and a diameter of 10 cm carries a current of 0.29 A. Calculate the magnitude of the magnetic field B inside the solenoid
Hi there!
We can use the following equation to calculate the magnetic field inside of a solenoid:
[tex]B = \mu_0 ni[/tex]
B = Magnetic Field Strength (T)
n = number of loops PER LENGTH
i = current through solenoid (A)
μ₀ = Permeability of free space (4π × 10⁻⁷ Tm/A)
First, we can solve for 'n' given 'N' (total # of loops) and L (length of solenoid).
[tex]n = \frac{N}{L} = \frac{200}{0.25} = 800[/tex]
Now, we can calculate the magnetic field:
[tex]B = (4\pi \times 10^{-7}) (800)(.29) = \boxed{2.915 \times 10^{-4} T}[/tex]
How much will stretch a spring that has spring constant of 735 N/m, if you vertically hung a 2. 30 kg object from it. How much work must an external agent do to stretch the same spring 6. 50 cm from its unstretched position?
Answer:
Part 1 = 0.03m, Part 2 = 1.4651J
Answer:
F = - K X
X = -F / K = M g / K = 9.8 * 2.3 / 735 = .03 m = 3 cm
W = 1/2 K X^2
W = 1/2 * 735 N/m * .065^2 m^2 = 1.55 Joules