When someone hits a wooden board, what is the action force? What is the reaction force?
Answer:
The board did exert an equal and opposite force, but your mass is considerably greater than the mass of the board so all the friction between you and the ground keeps you from accelerating.
If you punched the board while standing on perfectly slippery ice, or in a vacuum, you would accelerate also, but at a much smaller rate than the board due to the mass difference.
If you could ignore all losses (friction, the board breaking, etc.) then all Newton's 3rd Law really is saying is that the center of mass of the system doesn't change when you punch the board. So the board accelerates in the direction of your punch and you move away from it at rates that keep the system center of mass constant.
Explanation:
If a ride at Disneyworld goes from rest to 27 m/s in 2.8 seconds and the mass of the ride and riders together is 5000 kg (true data!), what is the average power required to do this?
Answer:
Approximately [tex]6.5 \times 10^{5}\; {\rm W}[/tex].
Explanation:
At a speed of [tex]v[/tex], the kinetic energy of the ride and the riders of mass [tex]m[/tex] (combined) would be:
[tex]\begin{aligned} \text{KE} &= \frac{1}{2}\, m\, v^{2}\end{aligned}[/tex].
If friction is negligible, [tex]\text{KE} = (1/2)\, m\, v^{2}[/tex] would be the work required to achieve this speed. That is:
[tex]\begin{aligned} \text{work} = \text{KE} = \frac{1}{2}\, m\, v^{2}\end{aligned}[/tex].
Given that this work was completed in a duration of [tex]t[/tex], the average power would be:
[tex]\begin{aligned} & (\text{average power})\\ =\; & \frac{(\text{work})}{(\text{time required})} \\ =\; & \frac{(1/2) \, m\, v^{2}}{t}\end{aligned}[/tex].
Substitute in [tex]m = 5000\; {\rm kg}[/tex], [tex]v = 27\; {\rm m\cdot s^{-1}}[/tex], and [tex]t = 2.8\; {\rm s}[/tex]:
[tex]\begin{aligned} & (\text{average power}) \\ =\; & \frac{(1/2) \, m\, v^{2}}{t} \\ =\; & \frac{(1/2) \times 5000\; {\rm kg} \times 27\; {\rm m\cdot s^{-1}}}{2.8\; {\rm s}} \\ \approx \; & 6.5 \times 10^{5}\; {\rm W}\end{aligned}[/tex].
(Note that if acceleration is constant, the power input to the ride would be proportional to [tex]t^{2}[/tex]. The average power of input to the ride would be a quarter of the peak power input. Multiplying average velocity (proportional to [tex]t[/tex]) by average force (proportional to [tex]t[/tex]) would overestimate the average power by [tex]100\%[/tex].)
How does the sound of the recorder travel through the air?
Answer:
Every physical object causes vibrations when it moves in the air. This leads to creation of waves in the air that then continue to travel as a form of sound. Much like the drum example we've mentioned above, our vocal cords also vibrate when we talk. This vibration happens in air, solid mediums and liquid.
FROM
LONESOMESTAR
1. A weightlifter applies 210 J of work to tire that weighs 85 N. How far does it move?
2. How long does it take to do 500 joules of work with 25 watts of power?
3. A person riding his bicycle has a weight of 45 N during a quick 30 m trail. if it takes him 600 seconds to complete the trail. How much power did he do?
Answer:
1) 2.47 meters
2) 20 seconds
3) 2.25 watts
Explanation:
1. W = F x S
S = W/F
= 210/85
= 42/17 m
= 2.47 meters
2. P = W/t
t = W/P
= 500/25
= 20 seconds
3. P = W/t
P = F x S/t
= 45 x 30 / 600
= 45/20
= 2.25 watts
What is the formula for the initial temperature
Q = mc(T - t0) it is the formula for the initial temperature
if a pair of forces are in the same direction but with different magnitudes these forces are
A. balanced
B. unbalanced
C. in equilibrium
D. non-existent
According to the diagram, (UV) ultraviolet light has a longer wavelength than
A) radio waves
B) infrared
C) x-rays
D) microwaves
Answer:
c. x-rays
Explanation:
How many countries have not adopted the metric or si system?.
Answer:
Three countries
Which are United States, Liberia, and Myanmar
what is foundation. please I want a simple definition
Explanation:
Foundation is a creative playground for artists, curators and collectors to experience the new creative economy.
Answer:
a coloured cream, powder, or liquid used as a base to even out facial skin tone before applying other cosmetics.
Straight line AB connects two point sources that are 5.00 m apart, emit 300 Hz sound waves of the same amplitude, and emit exactly out of phase.
(a) What is the shortest distance between the midpoint of AB and a point on AB where the interfering waves cause maximum oscillation of the air molecules?
(b) What are the (b) second and (c) third shortest distances?
what's potential difference?
Explanation:
Voltage, electric potential difference, electric pressure or electric tension is the difference in electric potential between two points, which is defined as the work needed per unit of charge to move a test charge between the two points. WikipediaWILL GIVE BRAINLEST TO CORRECT ANSWER
10 points
What is the freezing point (0 C) in K?
a.) 32 K
b.) 273 K
c.) 212 K
d.) -273 K
Answer:
B: 273 K
Explanation:
see answer.
What effect does increasing pressure have on gas particles.
Answer:
they go BOOM i seen a gas station do it
Explanation:
A red 5kg brick has an initial location of (0,0) on a flat surface and a velocity of 3m/s in the positive x direction. A tan 2 kg brick has an initial location of (3,0) which is 3 meters away and is stationary. Ignore friction.
The initial center mass of the two bricks is 2 kg.
Center mass of the two bricks
The center mass of the two bricks is determined by combining the momentum of the two bricks, with one as the reference point.
The initial center mass of the two bricksThe initial center mass of the two bricks is calculated as follows;
[tex]M_{cm} = \frac{M_0 + M_1}{v_1 + v_2} \\\\M_{cm} = \frac{5(0) \ + \ 2(3)}{0 + 3} \\\\M_{cm} = 2 \ kg[/tex]
Thus, the initial center mass of the two bricks is 2 kg.
Learn more about center mass here: https://brainly.com/question/13499822
Imagine you are mpho:how can you help your friend (phenyo) not to be influenced by media? you really feel she needs some help because she is neglecting her school work write 2 paragraphs
One of the ways to help someone not to be influenced by media is:
Encourage independent thinking.Let her know that she should make sure the information she is consuming is free from bias and is factual.What is Media Influence?This refers to the effects and reactions which the mass media has on the people who listen to them by shaping their views and by controlling the narrative.
With this in mind, we can note that if a person is overtly influenced by the media, then such a person lacks independent thinking and becomes emotional by what he watches on the television or reads from an online source.
This can be changed through the encouragement of independent thinking, and the need to check for factual information from the media news and also to focus more on studies.
Read more about media here:
https://brainly.com/question/26152499
What happens to water when it changes to ice?
Its density increases.
Its density decreases.
Its mass increases.
Its mass decreases.
Its volume increases.
Its volume decreases.
Answer:
its density decreases it volume increases
Explanation:
When water turns to ice, it expands / contracts. Water is more / less dense than ice. The water you drink is a solid / liquid / gas.
What is the electric potential 3. 0×10−11 m from a proton (charge +e )? Let V=0 at r=[infinity]
This question involves the concepts of electric potential, charge, and distance.
The electric potential is "48 V".
ELECTRIC POTENTIALThe electric potential of a point in the vicinity of a charge is given by the following formula:
[tex]V=\frac{kq}{r}[/tex]
where,
V = electric potential = ?k = Colomb's constant = 9 x 10⁹ N.m²/C²q = magnitude of charge = 1.6 x 10⁻¹⁹ Cr = distance from charge = 3 x 10⁻¹¹ mTherefore,
[tex]V = \frac{(9\ x\ 10^9\ Nm^2/C^2)(1.6\ x\ 10^{-19}\ C)}{3\ x\ 10^{-11}\ m}[/tex]
V = 48 volts
Learn more about the electric potential here:
https://brainly.com/question/9383604
According to the diagram, which choice has the shortest wavelength?
A) infrared
B) red visible light
C) blue visible light
D) yellow visible light
Answer:
Blue visible light
Explanation:
the distance between the crests of the waves is the shortest
A stone of volume 800 cm3 experiences an upthrust of 6.5 N when fully immersed in a certain liquid. Determine the density of the liquid.
F = ρgV
6.5 = ρ x 9.8 x 800 x 10⁻⁶
ρ = 829 kg/m³
What is its speed after 3. 83 as if it accelerates uniformly at −3. 04 m/s 2 ? answer in units of m/s.
The velocity equation is [tex]v_{final} =v_{initial} +at\\[/tex]
Known facts:
t = 3.83sa= -3.04intial velocity = 0Plug into equation known quantities:
[tex]v_{final} = (-3.04) * 3.83 = -11.6432m/s[/tex]
Thus the final velocity is -11.6432m/s
Hope that helps!
What is the atomic bomb equivalent of energy released during a 7. 0 quake? an 8. 0 quake? a 9. 0 quake?
Answer:
7. 0 = 500 kilotons of TNT = 2.0 x 10^15 joules
8.0 = 15 million tons of TNT = 6.3 x 10^16 joules
9.0 = 500 million tons of TNT = 2.0 x 10^18 joules
atomic bomb dropped on Hiroshima had a equivalent of 15 kilotons TNT
Explanation:
formula :
log E = 5.24 + 1.5M
M is richter scale magnitude
if 8.3 = richter scale magnitude
log E = 11.8 + 1.5M Write the formula.
log E = 11.8 + 1.5(8.3) Replace M with 8.3.
log E = 24.25 Simplify
10^log E = 10^24.25
E = 10^24.25
E ≈ 1.78 x 10^24 ergs ≈ 1.78 × 1017 joules
volcanodiscoverycomearthquakesenergy
colonialsdorg
which option is the best blackbody radiator?
Answer: The sun
Explanation: Trust me bro?
Oil having a density of 922kg/m^3 floats on water. A rectangular block of wood 3.97 cm high and with a density of 963 kg/m^3 floats partly in the oil and partly in the water. The oil completely covers the block. How far below the interface between the two liquids is the bottom of the block? Answer in units of m.
Explanation:
For the equilibrium:
\rho_{wood}gh-\rho_{oil}g(h-x)-\rho_{water}gx=0ρ
wood
gh−ρ
oil
g(h−x)−ρ
water
gx=0
\rho_{wood}h-\rho_{oil}(h-x)-\rho_{water}x=0ρ
wood
h−ρ
oil
(h−x)−ρ
water
x=0
(974)(3.97)-928(3.97-x)-1000x=0(974)(3.97)−928(3.97−x)−1000x=0
x=2.54\ cmx=2.54 cm
An explosion takes place in space. Which type of waves from the explosion can be observed on Earth?
Answer:
Infra red waves, visible light waves,
Explanation:
what effect does speed have on braking distance
Answer:
Here u go :)
Explanation:
The more the speed is, the more braking distance it will need.
Hope it helps.
Answer:
Greater Speed requires Greater braking distance
Explanation:
Not counting road condition tire quality and brake wear inspect your tires and brakes often always allow more safety zone on bad road conditions or when towing another vehicle such as a trailer, Empty trailers are often more dangerous than loaded ones
For the circuit shown in the figure(figure 1) find the current through each resistor. Express your answers using two significant figures. Enter your answers numerically separated by commas.
The current flowing in each resistor of the circuit is 4 A.
Equivalent resistance of the series resistors
The equivalent resistance of the series circuit is calculated as follows;
6 Ω and 4 Ω are in series = 10 Ω
5 Ω and 10Ω are in series = 15 Ω
Effective resistance of the circuit[tex]\frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2} \\\\R = \frac{R_1R_2}{R_1 + R_2} \\\\R = \frac{10 \times 15}{10 + 15} \\\\R = 6 \ ohms[/tex]
Current flowing in the circuitV = IR
I = V/R
I = 24/6
I = 4 A
Learn more about resistors in parallel here: https://brainly.com/question/15121871
which chemical equation is balanced?
Answer:
C no.Explanation:
Mark me me brainliest plz i really need it （⌒▽⌒）True or False. During the 1500s and 1600s evidence from around the world including fossils and glacial deposits and mapped locations of geologic features provided evidence that the continents were indeed once connected.
Answer:
The awsner to that is true
true
becauses betwwen they fights and its easy
Among the substances given below which cannot be electrified by friction
amber, plastic, hacksaw blade
Answer:
Hacksaw blade because it is metal.
The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?
Answer:
Rubber or plastic covers are bad conductors of electricity. So they do not allow the electric current to pass through it.
Explanation:
Rubber and plastic are bad conductors of electricity, therefore when handling a tool with a rubber handle, the electricity will not pass through it.
Answer:
rubber and plastic are insulators and are bad conductors of electricity
