You accidentally drop a book down a stairwell. Assuming no air resistance,
how fast will the book be moving after 0.75 seconds?
Answer:
if we drop it and not throw it then
after 0.75 how fast the book is falling is given by its velocity as
v= at
= 9.8 × 0.75
=7.35 m/s
How long will it take you to drive the 256 miles to get to the Mackinac Island Ferry if you average 70 mi/hr? If you leave at 3:00, what time will you get there? *Using speed formula
Answer:
If the speed is 70 mile/hour, the time to drive the 256 miles is:
T = 256/70 = 3.66 hours = 3 hours and 39.6 minutes
If you leave at 3:00, then at 6 hours and 39.6 minutes, you will get there.
Hope this helps!
:)
Calculate the efficiency of an engine if the work input is 300. J and the work output is 100. J
Answer:
33.33%
Explanation:
take efficiency =power output/power input multiply by 100%
Question 2
A wave with a frequency of 10 Hz and a wavelength of 4 m would have what speed?
m/s
Answer:
speed = 40 m/s
Explanation:
speed = frequency x wavelength
speed = 10 Hz x 4 m
speed = 40 m/s
A bottlenose dolphin can hear sounds with frequencies up to 1.5 x 10^5 Hz. If the speed of sound in sea water is approximately 1.5 x 10^3 m/s, what is the wavelength of the wave thae dolphin can hear?
a
2.25 x 10^2 m
b
1 x 10^-2 m
c
1 x 10^2 m
Answer:
b. 1.0 × [tex]10^{-2}[/tex] m
Explanation:
The wavelength of a wave is the distance between successive crests or troughs. It is measured in meters, and related to velocity and frequency of the wave by:
v = fλ
Where v is the velocity, f frequency and λ is the wavelength of the wave. Given that; f = 1.5× [tex]10^{5}[/tex] Hz and v = 1.5 × [tex]10^{3}[/tex], then:
λ = [tex]\frac{v}{f}[/tex]
= [tex]\frac{1.5*10^{3} }{1.5*10^{5} }[/tex]
= 1.0 × [tex]10^{-2}[/tex] m
The wavelength, λ, of the wave is 1.0 × [tex]10^{-2}[/tex] m.
calculate the pressure exerted by a mercury column of 76 cm high at its bottom.Given that density of mercury is 13600kg/m^3 and g=9.8
Answer:
Explanation:I don't say you have to mark my ans as brainliest but if you think it has really helped you plz don't forget to thank me ...
Caleb conduce su motocicleta por con una velocidad constante de 38 km/h y luego por otras 2 horas con una velocidad constante de 20 km/h. ¿Cuál es su velocidad media para el viaje total?
Answer:
No Lo se :v esque estoy enferma del
Culovirus :v ༎ຶ‿༎ຶYour home energy bill is given in what kind of units?
Answer:
Home energy bill/electricity bill is measured in Kilowatt hours.
Water bill is measured in gallons & gas units is measured in BTUs.
hope it helps!
What controls the flow of electrons in a circuit?
the car is moving on a straight road at a speed of 15m / s. The driver of the car starts overtaking with an acceleration of 2m / s². Determine how fast the car has reached after 6s from the start of overtaking. The speed at uniformly accelerated rectilinear motion with the initial speed is calculated by the formula v = vo + at.
Answer: 27 m/s
Explanation:
vo = 15 m/s
a = 2 m/s^2
t = 6s
v = vo + at
v = 15 + 2(6)
v = 15 + 12
v = 27 m/s
A point charge (5.0 pC) is located at the center of a spherical surface (radius = 2.0 cm), and a charge of 3.0 pC is spread uniformly upon this surface. Determine the magnitude of the electric field 1.0 cm from the point charge.
Answer:
E = 0.45 kN/C
Explanation:
From; the question, we can opine that the electric field inside the hollow sphere as a result of the charge at the surface is zero.
Using the equation:
[tex]\mathbf{E = kq/r^2}[/tex] to determine the magnitude of the electric field with the radius 1.0 cm from the point charge.
where ;
constant k = [tex]8.98*10^9[/tex]
point charge q = 5.0 pC = 5.0 × 10⁻¹²; we have :
[tex]\mathbf{E = kq/r^2}[/tex]
[tex]\mathbf{E =\dfrac{8.98*10^9*5*10^{-12}}{1.0^2}}[/tex]
E = 0.45 kN/C
Where is earth's magnetic north pole located?
Answer: it is located over Ellesmere Island, Canada
Explanation
it is now drifting away from North America and toward Siberia.
Answer:ellesmere island, Canada
Filiberto va a 90m/s en su carri, de repente se distrae por un par de segundos y su velocdad pasa a 40 m/s ¿cual fue su aceleracion de su movimientonto
Answer:
Filiberto experimenta una deceleración de [tex]2\,\frac{m}{s^{2}}[/tex].
Explanation:
(The problem was written in Spanish. Hence, explanation will be held in Spanish).
Asúmase que Filiberto se distrae por 2 segundos, puesto que un par equivale a dos, y que el vehículo experimenta un aceleración constante. La deceleración experimentada por el vehículo se deriva de la siguiente fórmula:
[tex]a = \frac{v-v_{o}}{\Delta t}[/tex]
[tex]a = \frac{40\,\frac{m}{s}-90\,\frac{m}{s} }{2\,s}[/tex]
[tex]a = -25\,\frac{m}{s^{2}}[/tex]
Filiberto experimenta una deceleración de [tex]2\,\frac{m}{s^{2}}[/tex].
someone help me plz
Answer:
Aerobic exercise includes?
(C) All activities that make you tired and short of breathe.
2. Which choice is an intense exercise that involve short burst of activity in which the muscles worked so hard that they produce energy without using energy?
(B) anaerobic exercise
Explanation:
_ Ba+_O2 =_BaO how do I balance this?
Answer:
02-ba=_4
Explanation:
4. What is the amplitude of the waves shown in the diagram below?
Answer:
7.5 m
Explanation:
How can Newton’s Laws be used to explain how and why things move?
Answer:Newton used these laws to explain and explore the motion of physical objects and systems, Newton's three laws are: If an object experiences no net force, its velocity will remain constant. The object is either at rest and the velocity is zero or it moves in a straight line with a constant speed.
Explanation:
Thorium ____ has 90 protons and 137 neutrons.
Answer:
Thorium 227 (also known as Radioactinium)
Which structure reduces friction between joints?
Answer:
The cartilage is the structure that reduces friction between joints.
Explanation:
Cartilage is the tissue between the bone joints. They are composed of several membranes and cellular groups. One of them called synovial membrane which provides lubricant to the edges of tissue that are touched by the bones. Reducing the friction and absorbing it so the body can move without obstacles.
True or false? All three types of ionising radiation have the potential to make cells become cancerous or even kill them completely.
Answer:
true
Explanation:
All three types of ionising radiation have the potential to make cells become cancerous or even kill them completely.
Calculate the power in the 1 ohm resistor. What do I do?
Answer:
p1 = 9 watt
Explanation:
first find the current :
i = V/r1 +r2 = 12 / (1+3) = 3 A
Next, find the voltage in the 1 ohm resistor:
V1 = r1 * i = 1 * 3 = 3 volt
Now calculate power in the 1 ohm resistor :
P1 = i * V1 = 3 * 3 = 9 watt
If there is a big mass, it would need a stronger force to accelerate it. Which law does this describe?
Answer:
Newton's second law
Explanation:
The greater the mass of an object, the less it will accelerate when a given force is applied.
What is electricity?
Answer:Electricity is the flow of electrons. All matter is made up of atoms, and an atom has a center, called a nucleus. When electrons are "lost" from an atom, the free movement of these electrons constitutes an electric current. Electricity is a basic part of nature and it is one of our most widely used forms of energy.
Explanation:
Answer:
Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Various common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges and many others.a form of energy resulting from the existence of charged particles (such as electrons or protons), either statically as an accumulation of charge or dynamically as a current.
Explanation:
Dados los vectores a ⃗=6m y b ⃗=8m encontrar su resultante cuando Forman ángulo recto de 90° Son paralelos de igual sentido Son paralelos de sentido contrario
Answer:
I will answer in English, and i will give some representation for each case:
We have a = 6m and b = 8m.
If they are perpendicular, we have that:
a = (6m, 0) b = (0, 8m)
The adition is:
a + b = (6m, 8m).
If they are parallel, we have;
a = (6m, 0)
b = (8m, 0)
a + b = (6m + 8m, 0) = (14m, 0 )
If they are parallel but opposite:
a = (6m, 0)
b = (-8m, 0)
a + b = (6m - 8m,0) = (-2m, 0)
I dont get it. The formula for this is
y[tex]\frac{amount of energy}{time}[/tex]
Answer:
5000 W
Explanation:
you are technically correct, but the question is asking for units in Watts
Recall that Power rating is the energy per unit time
= Energy ÷ Time
= 300,000 ÷ 60
= 5000 j/s
but we are told that the unit is a single letter, and recall that joules/s = watts
hence
5000j/s = 5000 W
edit: typo. Missing a zero from answer
A wave that can travel with or without a medium is called a(n)
A.surface wave
B.mechanical wave
C.electromagnetic
wave
D.all waves can travel
in any way
Answer:
C
Explanation:
Answer A: A surface wave is a wave that travels along the surface of a medium.
Answer B, C: Electromagnetic waves are waves that have no medium to travel whereas mechanical waves need a medium for its transmission.
Answer D: The sentence in the answer D does not fit to the blank in the definition ( of the question )
......
Hope this answer can help you.
The RMS potential difference of an AC household outlet is 117 V. a) What is the maximum potential difference across a lamp connected to the outlet? b) If the RMS current through the lamp is 5.5 A, what is the lam
Answer:
a. 165.5 V
b. 7.78 A
Explanation:
Here is the complete question
The RMS potential difference of an AC household outlet is 117 V. a) What is the maximum potential difference across a lamp connected to the outlet? b) If the RMS current through the lamp is 5.5 A, what is the maximun current through the lamp.
Solution
a. The maximum potential difference across the lamp V₀ = √2V₁ where V₁ = rms value of potential difference = 117 V
V₀ = √2V₁ = √2 × 117 V = 165.5 V
b. The maximum current through the lamp I₀ = √2I₁ where I₁ = rms value of current = 5.5 A
V₀ = √2V₁ = √2 × 5.5 A = 7.78 A
True or false? One reason gases are easy to compress is because their particles have higher energy.
The given statement is true as molecules in gas are far away from each other due to weak forces of attraction.
What are forces of attraction?
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
Learn more about forces of attraction ,here:
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The image produced by a concave mirror is _____
Answer : virtual or real
Answer:
Mostly real
Explanation:
Concave mirrors can have real images.
“ If the object is further away from the mirror than the focal point, the image will be upside-down and real meaning that the image appears on the same side of the mirror as the object.”
The image produced by a concave mirror is virtual or real.
What is concave mirror?When a hollow sphere's inside surface serves as the reflecting surface and the cut part's outside is painted, the result is a mirror. The term "concave mirror" refers to this kind of mirror.
Concave mirrors have certain characteristics.
When light hits the concave mirror's reflecting surface, it converges at a single point and reflects back. A converging mirror is another name for it as a result.A magnified, upright, virtual image can be created by placing the concave mirror very close to the object.The concave mirror creates an image that might be little or large, real or virtual.Learn more about Concave mirrors here:
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Why does a Parallel Circuit still continue to function after a switch turns off one bulb but continues to pass through the second bulb? (please be as specific as possible)
Explanation:
In short, when we switch off a branch, the remaining branch still forms a complete circuit with the battery, so electricity still pass through the remaining branch.
Technically speaking, the voltage in each branch is the same, and the resistance of the light bulb remains unchanged (neglect effect of temp.) by V=IR, the current should remain unchanged after switching off the other branch.