A person on a bicycle travels a distance of 12.5 km in 2.1 hrs, what was the speed of the person on the bicycle?
Answer:
5.9 km/hour
Explanation:
divide 12.5 by 2.1 and the answer is 5.9
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:
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
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.
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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:
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
2. Three identical lamps are connected in
series with each other. If the resistance
of each lamp is X ohms, what is the
equivalent resistance of this series
combination?
(1) ΧΩ
(3) 3X22
(2) 2
2
(4) 2
w/
X
The equivalent resistance of the series combination is : 3XΩ
Determine the Equivalent ResistanceEquivalent Resistance is the total resistance in circuit (i.e parallel or series circuits).
Bulb in series have the same resistance. Therefore each Bulb has a resistance of XΩ
equivalent resistance = [tex]R_{1}[/tex] + [tex]R_{2}[/tex] + [tex]R_{3}[/tex]
Let [tex]R_{1}[/tex] represent resistance of bulb one
[tex]R_{2}[/tex] represent resistance of bulb two
[tex]R_{3}[/tex] represent resistance of bulb three
equivalent resistance = X + X + X
equivalent resistance = 3XΩ
In conclusion, the equivalent resistance of the series combination of Three identical lamps connected in series with each other with a resistance of X ohms each is 3XΩ
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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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Suppose that a college physics experiment goes horribly wrong and releases an electronic pulse that renders all electronic equipment in the cities of columbus, cleveland and cincinnati, ohio permanently useless. No people are hurt, and no buildings are damaged. After the accident, the wages earned by ohio workers will.
Answer:
It will decrease because the marginal productivities of workers will decrease. Diminishing marginal product occurs when the marginal product of an input goes down as the quantity of the input goes up. The transformation in product resulting from employing one more unit of a particular input for instance, the change in output when a firm's labor is mark up from five to six units, assuming that the mass of other product are kept constant is called The input of marginal product or marginal physical product.
Explanation:
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.
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].
In which direction is there a net force of 200 N?
Coordinate plane with top and bottom of x axis labeled 300 N and left side of y axis labeled 200 N and right side labeled 400 N with a point marked closer left of center
Question 2 options:
left
right
up
down
Answer:
right
Explanation:
The up and down forces cancel
then you are left with a -200 and a + 400
resulting in a + 200 (to the right)
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.
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
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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Two coils connected in series have a resistance of 36 ohm and when connected in parallel have a resistance of 8ohm. Find resistance of each coil
Answer:
Explanation:
Remark
Two resistances in series has the form of
Rs= C1 + C2
Two resistances is parallel has the form of
Rp = (C1 *C2)/(C1 + C2)
The plan is to first of all find C1*C2 and use this information and C1 + C2 to find the individual resistances.
Givens
Rs = 36 ohms
Rp = 8 ohms
Solution
Rp = C1 * C2/(C1 + C2)
Rp = 8 ohms
C1 + C2 = 36 ohms
8 = C1*C2 / 36 Multiply by 36
8* 36 = C1*C2
C1*C2 = 288
Use Rs to solve for C1
C1 + C2 = 36C1 = 36 - C2(36 - C2) * C2 = 288
36*C2 - C2^2 =288 Multiply by - 1
-36C2 + C2^2 = -288 Add 288 to both sides
C2^2 - 36C2 + 288= 0 Factor this equation
(C2 - 12)(C2 - 24)
C2 - 12 = 0
C2 = 12
C2 - 24 = 0
C2 = 24
C2 = 24 or
C2 = 12
C1 = 36 - C2
C1 = 36 - 24 = 12
C1 = 36 - 12 = 24
Answer
C1 = 12 ohms or 24 ohms
C2 = 24 ohms or 12 ohms
3. Give an example of a mechanical wave that changes frequency.
Answer:
No , impossible
Explanation:
Mechanical waves are those waves which requires a medium to travel through. for example sound ,if you put a speaker inside vaccum you can't hear it .As they changes their medium their wavelength is changed but frequency remains same_____ 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.
The slope of a speed-time linear graph is NOT_____.
acceleration
direction
Answer:
direction
Explanation:
the slope of a velocity time graph is the acceleration
What would decrease the efficiency of this truck?
A. Keep the truck well-oiled.
B. Change the oil frequency.
C. Take off the brake pads.
Please help!!
Answer: The answer isC .
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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How will you describe the horizontal and vertical motions of a projectile?
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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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:
How long does it take light to travel from jupiter to earth?.
A –0.06 c charge is placed is in a uniform electric field with a strength of 200 n/c. what is the magnitude and direction of the force on the charge? 12 n in the opposite direction of the field 12 n in the same direction of the field 3333 n up in the opposite direction of the field 3333 n in the same direction of the field
The magnitude of the charge is 12 N in the opposite direction of the field.
What is Electric field?The term electric field refers to the region in space where the effect of a charge is felt. In this case, we are told that the magnitude of the charge is –0.06 C.
Hence;
E = F/q
F = Eq
F = –0.06 C * 200 N/C
F = 12 N
Hence, the magnitude of the charge is 12 N in the opposite direction of the field.
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Answer:
A
Explanation:
Edge
In what way is a touch screen similar to a CCD? In what way is it different?
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]
A metal block has a mass of 5 grams and a volume of 1 cm3. What is the density of a piece of the same identical metal but with a different shape and different volume
Answer:
ρ = Mass / Volume definition of density
ρ = 5 g / 1cm^3 = 5 g / cm^3
Since the other object is made of the same metal its density is the same:
ρ = 5 g/cm^3
The density of a piece of the same identical metal but with a different shape and different volume is [tex]\rho = 5 g/cm^3[/tex].
What is density?The density of a substance is its mass per unit volume. Density gives information about how tightly the substance is packed together. The formula for density is
[tex]\rho ={\frac {m}{V}}[/tex]
Unit of density is grams per cubic centimetre.
What are uses of density?One of the most common uses of density is in how different materials interact when mixed together.Wood floats on water because it has a lower density than water, while an anchor sinks as the metal has high density.Balloons filled with helium gas float because the density of the helium is low than the density of air.Given:
Mass, [tex]m = 5 g[/tex]
Volume, [tex]V = 1 cm^{3}[/tex]
The density of metal is
[tex]\rho = \frac{5}{1}\\ \\\rho = 5 g/cm^{3}[/tex]
Since, the other object is made of the same metal. So, density is the same.
[tex]\rho = 5 g/cm^3[/tex]
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