If an object is in free fall for four seconds, about how fast
will it be falling?
a) 10 m/s
b) 20 m/s
c) 30 m/s
d) 40 m/s
how does the number of protons change as atomic number increases by one
Tanya and her brother are racing with their new bikes in the neighborhood. Their block is one mile long. Tanya's average speed is 0.15 mi/s and her brother's is 0.11 mi/s. Who will reach the end of block first, and how much time ahead of the other will they be?
Answer:
Tanya
[tex]2.43\ \text{s}[/tex]
Explanation:
[tex]d[/tex] = Distance traveled = 1 mile
[tex]s_t[/tex] = Tanya's average speed = [tex]0.15\ \text{mi/s}[/tex]
[tex]s_b[/tex] = Tanya's brother's average speed = [tex]0.11\ \text{mi/s}[/tex]
Time taken by Tanya
[tex]t=\dfrac{d}{s_t}\\\Rightarrow t=\dfrac{1}{0.15}\\\Rightarrow t=6.67\ \text{s}[/tex]
Time taken by Tanya's brother
[tex]t=\dfrac{d}{s_b}\\\Rightarrow t=\dfrac{1}{0.11}\\\Rightarrow t=9.1\ \text{s}[/tex]
So Tanya will reach the end of the block first.
She will reach the end of the block by [tex]9.1-6.67=2.43\ \text{s}[/tex]
Which of the following best explains Newton's Second Law? Answer A Masses accelerate, which generates forces. B The acceleration produced is a result of the force applied to a mass. C Forces are a result of the acceleration applied to a mass. D Objects with a constant rate of motion include those with a net force.
Answer:
B The acceleration produced is a result of the force applied to a mass.
Explanation:
The most fitting explanation for Newton's second law of motion is that acceleration produced is a result of the force applied.
Acceleration is the rate of change of velocity with time
Mass is the amount of matter in a substance
Force is the push or pull applied on a body to cause it to move
According to Newton's second law of motion:
"acceleration occurs when force is applied on a given mass";
Mathematically;
Force = mass x acceleration
Answer:
Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Explanation:
h. “Pujan's living with her husband now."
Sujata said ..... change into indirect reporting. plz send me fast so urgent
Sujata said that Pujan was living with her husband then
Answer:
sujata said that pujan was living with her husband
If the force of gravity on an object increases, what happens to its weight?
Answer:
It also increases
Explanation:
The strength of the gravitational force between two objects depends on two factors, mass, and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases.
A brick is cut into small pieces. Which physical property do the small pieces have in common with the brick from which they came?
Answer:
Density
Explanation:
Density is defined as the ratio of mass of an object to the volume of object.
The density remains an equivalent because cutting the brick into small pieces will divide the mass & volume by an equivalent amount. This means the density of a object remains an equivalent (or same) regardless of what size shape, length, it is.
Select the best answer from the choices below. Light has many properties of waves but sometimes it also behaves like: A photon Polarized light ultraviolet rays schem of particles
Answer:
The correct option is;
Stream of particles
Explanation:
Light can be observed to behave as stream of particles in the physical phenomenon of blackbody radiation and photoelectric effect whereby electrons are ejected by the impact of light such that the number of electrons ejected is a function of the amount of photons transmitted which are absorbed by the electrons before they can be ejected
The energy of the photons depends on the frequency of the light source of the photons, while the electrons are ejected when the energy of the photon is up to their threshold value
As such light can also be considered as behaving as a stream of particles called photons.
A ball is thrown vertically upward at a 19.6m/s. For its complete trip, it's average speed is?
Answer:
The average velocity of an object is given by:
Average velocity = total displacement / total time
First, we calculate the time taken to reach the maximum height of the ball. This occurs when the final velocity is 0.
Vf = Vi + at
0 = 19.6 - 9.81 * t
t = 2 seconds
The total trip will be of 4 seconds (2 seconds up, 2 seconds down)
The total displacement is given by:
s = ut + 1/2 * at²
s = 19.6 * 2 - 0.5 * 9.81 * 2²
s = 19.6 meters
This is the distance maximum height, so the total height is
19.6 * 2 = 39.2 meters
Average velocity = 39.2 / 4
Average velocity = 9.8 m/s
Explanation:
Hope this helped!
Happy Halloween!
Do waves transfer or transport energy
Answer:
i think transport energy....but i'm not sure ...
Explanation:
A wave carries energy and momentum but does not carry matter: the particles vibrate around the equilibrium position but do not travel with the disturbance
A motorcyclist started a race from the start line and from rest, and accelerated with the acceleration of 3m/s2 for 8 secs. Then he was moving with a constant velocity for 2 secs. What was the racer’s position from the start line after 9+2 seconds from the start of the race?
Answer:
I dont even know my g
Explanation:
Like i cant even help u
On Earth, a scale shows that you weigh 360 N. What is your mass?
Answer:
this might be confusing but..
Explanation:
To find an object's mass using its weight, the formula is Mass equals Weight divided by the Acceleration of Gravity (M = W ÷ G). Convert the weight measured in pounds to the equivalent in Newtons. In the formula for determining mass based on weight, mass is measured in Newtons.
4. The lightest pilot-driven airplane ever built was the Baby Bird. Suppose the Baby Bird moves along the ground without a pilot at a speed of 88.0 km/h. Under these circumstances, the momentum of the empty plane would be only 2,790 kg • m/s. What is the mass of the plane?
Answer:
Explanation:
mass x velocity
so i believe it'd be
2,790 x 88.0
but i could be wrong just an fyi
The most popular commercial aircraft worldwide range in weight from 30,900 to 127,000 pounds. Personal aircraft typically weigh between 740 to 2,750 pounds, which is a significant reduction in weight. The weight of a modern fighter jet ranges from 20,300 to 45,000 pounds. Aircraft are hefty.
How do you determine an airplane's weight?Determine the empty weight of the aircraft and the weights of passengers, luggage, and fuel by consulting the pilot's operating manual. To determine the moment, multiply each weight by the arm, which is the separation from the reference datum. To determine the gross weight, add up all the weights. To find the total moment, add all the moments together. The maximum weight of an aircraft is determined by the amount of lift that the wings or rotors can provide under the operational conditions for which the aircraft is designed. The maximum weight that the aircraft can safely carry is also limited by its structural strength. Empty weight (EW) is the sum of the manufacturer's 'as built' empty weight (MEW), any standard items (SI), and any operator items (OI), so EW = MEW + SI + OI. The EW is calculated for each aircraft series and each unique configuration of an aircraft and is validated by weighing it on a regular basis.To learn more about Mass of the plane refer to:
https://brainly.com/question/28591365
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Which game most represents a wave?
Answer:
D: tipping over dominoes
Explanation:
tipping over dominoes makes a wave-like movement
Answer:
the answer is D. just got it right 4/19/22
Explanation:
If you pair copper which has an electron affinity of 0.34 and silver which has an electron affinity of 0.80, will you make a strong battery or a weak one? Explain how the materials affect the function of the battery. (4 points)
what is a scientific model in short words
Answer:A scientific model is a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes. Scientists seek to identify and understand patterns in our world by drawing on their scientific knowledge to offer explanations that enable the patterns to be predicted.
Explanation: got right
Answer:
A scientific model is a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes. Scientists seek to identify and understand patterns in our world by drawing on their scientific knowledge to offer explanations that enable the patterns to be predicted.
Serafina has finished cleaning and organizing her bedroom and put away the last of her shoe storage containers. She has a lifting force of 25 N and moved the container a distance of 3 meters. How much work did she do? (Make sure you include proper units in your answer.)
Answer: Work DONE =- 75Nm = 75 Joules
Explanation:
Work is done when a force applied to an object, cause a displacement by causing such object to move Thus work is calculated by multiplying the force by the distance moved by the object.
From the question,
Given that force= 25N
Distance = 3m
therefore
Work = Force x Distance
25N X 3m =
= 75 Nm = 75 Joules
Which of the following groups have one valence electron and are very reactive
A-column 1 alkali metals
B-Column 2 alkaline earth metals
C-column 17 halogens
D-column 18 noble gases
___________ force is a supportive force that surfaces exert in order to prevent solid objects from passing through one another.
A. Contact
B. Regular
C. Normal
D. Field
the picture below shows a centrifuge used to test astronauts
Which vectors shows the direction of the centripetal acceleration at this point?
A. A
B. B
C. C
D. D
[PLEASE SOMEONE HELP! ASAP]
Answer: B
Explanation: just did the quiz
Vector B shows the direction of the centripetal acceleration at this point.
What is centripetal acceleration?Centripetal acceleration is the acceleration of a frame traversing a circular path. because the pace is a vector quantity (this is, it has both a magnitude, the rate, and a course), when a frame travels on a circular course, its route continuously adjustments, and accordingly its velocity changes.
What reasons for centripetal acceleration?Centripetal forces motivate centripetal accelerations. within the special case of the Earth's circular motion around the sun – or any satellite's ground movement around any celestial body – the centripetal force causing the movement is the end result of the gravitational enchantment among them.
Learn more about centripetal acceleration here: https://brainly.com/question/11770998
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Planet X has a mass of M and a radius of R. Planet Y has a mass of 3M and a radius of 3R. Identical satellites orbit both planets at a distance R above their surfaces, as shown above. The planets are separated by such a large distance that the gravitational forces between them are negligible.
How does the magnitude of the gravitational force FY exerted by Planet Y on its satellite compare to the gravitational force FX exerted by Planet X on its satellite?
Answer:
[tex]{FY} = \dfrac{3}{4} \times FX[/tex]
Explanation:
The parameters given for the planets are;
The mass of planet X = M and the radius of planet X = R
The mass of planet Y = 3·M and the radius of planet Y = 3·R
The magnitude of the gravitational force of the planets on their satellites are given by the following equation;
[tex]F=G \times \dfrac{M_{1} \cdot m_{2}}{R^{2}}[/tex]
Where;
M₁ = The mass of the first object = The mass of the planet
m₂ = The mass of the second object = The mass of the satellite
R = The distance between the centers of the two planets = The distance between the center of the planet and the satellite
G = The universal gravitational constant
The force between planet X and the satellite in its orbit = [tex]FX=G \times \dfrac{M \times m}{(2 \cdot R)^{2}} = G \times \dfrac{M \times m}{4 \cdot R^{2}}[/tex]
The force between planet Y and the satellite in its orbit = [tex]FY=G \times \dfrac{3\cdot M \times m}{(4 \cdot R)^{2}} = G \times \dfrac{3\cdot M \times m}{16 \cdot R^{2}} = G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}[/tex]
Therefore;
[tex]\dfrac{FY}{FX} = \dfrac{G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}}{G \times \dfrac{M \times m}{4 \cdot R^{2}}} = \dfrac{3}{16} \times \dfrac{4}{1} = \dfrac{3}{4}[/tex]
[tex]{FY} = \dfrac{3}{4} \times FX[/tex]
The needs of society have no effect on technology. true or false
Answer:
False
Explanation:
A lot of inventors worked on inventions due to things that society needed. For example, Alexander Graham Bell created the telephone because we didn't have a stable line of communication back then.
Bart carried his skateboard up a hill and then rode the skateboard down the hill. When he reached the bottom of the hill, he rolled to a stop. When did Bart have the most potential energy?
Explanation:
The potential energy of an object is given by :
P = mgh
Where,
m is mass, g acceleration due to gravity and h is the height reached by the object.
The potential energy of an object is directly proportional to the height of the object. It means that when the skateboard reaches at the maximum height, it has highest potential energy.
In 1978, Geoff Capes of the United Kingdom won a competition for throwing 5 lb bricks; he threw one brick a distance of 44.0 m. Suppose the brick left Capes' hand at an angle of 45.0° with respect to the horizontal a. What was the initial speed of the brick? b. What was the maximum height reached by the brick?
Answer:
A) 20.8 m/s
B) h_max = 11 m
Explanation:
A) Formula for projectile range is;
R = (u²sin2θ)/g
We want to find initial velocity, so let's make u the subject.
u = Rg/sin2θ
We are given;
R = 44 m
θ = 45°
Thus;
u = √[(44 × 9.8)/sin 2(45)]
u = √[431.2/sin 90]
u = 20.77 m/s ≈ 20.8 m/s
B) maximum height will be gotten from the formula;
h_max = (R tan θ)/4
h_max = (44 × tan 45)/4
h_max = (44 × 1)/4
h_max = 11 m
When the amount of which 2 gases in the atmosphere change, the amount of energy absorbed by the surface changes.
Answer:
The earth-atmosphere energy balance is the balance between incoming energy from the Sun and outgoing energy from the Earth. Energy released from the Sun is emitted as shortwave light and ultraviolet energy. When it reaches the Earth, some is reflected back to space by clouds, some is absorbed by the atmosphere, and some is absorbed at the Earth's surface.
Explanation:
Mechanical and chemical weathering depend on _______________________________________ and temperature.
A.) acid
B.)air
C.)water
Answer:
C.)water
Explanation:
Weathering is the physical disintegration and chemical decomposition of rocks to form sediments and soils.
Mechanical weathering is the breaking down of rocks by physical means.
Chemical weathering is the decay of rocks by chemical means.
Both chemical and mechanical requires water for the processes to occur. Water is usually the medium for chemical actions to take place in a rock. For mechanical processes, water in different phases plays a very important role too.What waves have a lot of energy and are potentially harmful
Help me please!!!!!!........
Answer:
i. A is converging lens B is diverging lens
ii. if the lens is thicker at it's center than its edge it is called converging lens and
if the lens is thinner at it's center than its edge it is called diverging lens. (thicker and thinner)
III. lensA
it said to be positive focal length
it always produce an upright image
lensB
it said to be negative focal length
it produce an upright image if the object is located in front of the focal point
2. example of lens A
plane mirror
convex mirror
example of lens B
concave mirror
Glasses
Answer:
[tex]question \:1. i. \\ \\ \boxed {A} \: is \: a \: \boxed{converging} \: lens \\ while \\ \boxed {B}\: is \: a \: \boxed{diverging} \: lens, \\ \\ question \:1. ii. \\ \\ \boxed {A} \:is \: a \: \boxed{converging} \: lens \: because \: i \: was \: able \: to \: identify \: \\ that \:A's \: center \: is \: ticker \: than \: it's \: edge.
\\ while\\ \boxed {B} \:is \: a \: \boxed{diverging} \: lens \: because \: i \: was \: able \: to \: identify \: \\ that \:B's \: center \: is \: thinner \: than \: it's \: edge. \\ \\ question \:1.i ii. \\ \\ \boxed {A} \:as \: a \: \boxed{converging} \: lens \: is \: curved \: outward \: and \: has \: an \: oval \: shape.
\\ while \\ \boxed {B} \:as \: a \: \boxed{diverging} \: lens \: is \: curved \: inwards. \\ \\ question \: 2. \\ \\ rainbow : \\ in \: the \: rainbow \: effect \: the \: concept \: of \: the \: refraction \\ \: of \: the \: sun's \: light \: rays \: as \: it \: enter \: the \\ \: rain \: (that \: causes \: the \: effect : rainbow) \: is \: an \: example. \\ another \: one \: is : \\ bent \: object : \\ the \: appearance \: of \: bent \: objects \: like \: pen \: or \: any \\ \: object \:inside \: a \: glass \: of \: water \: is \: due \: to \: refraction.[/tex]
Explanation:
♨Rage♨
Which of the following describes the amount
of heat needed to raise the temperature of
one gram of a substance by one degree?
11°
Specific heat.
Answer:
Specific heat
Explanation:
The specific heat of a substance is the amount of heat required to raise the temperature of 1g of such substance by 1K.
Specific heat of substance depends on the nature of the substance. For most conductors of heat, specific heat value is quite low because increase in temperature is attained very fast.
But for poor conductors such as water, they have a high specific heat capacity. They do not lose nor gain heat readily. More heat must be supplied to cause a significant rise in temperature.
The relationship;
H = m x c x Ф
shows the relationship between the amount of heat, mass , specific heat and temperature change.
H is the amount of heat
m is the mass
c is the specific heat
Ф is the temperature change
A 75.0 kg man is standing at rest on ice while holding a 4.00kg ball. If the man throws the ball at a velocity of 3.50m/s forward what will his resulting velocity be
Explanation
According to law of conservation of momentum
m1u1 + m2u2 = (m1+m2)v
m1 is mass of the man 75kg
u1 is the velocity of the man 0m/s
m2 is the mass of the ball = 4kg
u2 is the velocity of the ball = 3.5m/s
We are to find v
Substitute
75(0)+4(3.5) = (75+4)v
0 + 14 = 79v
v = 14/79
v = 0.177m/s
Hence his resulting velocity will be 0.177m/s
