Answer:
O bike tires on the road as you ride
Explanation:
is the rolling friction
Answer:
B. Bike tires on the road as you ride
Explanation:
Please give brainliest!
1. A sailboat moves north for a distance of 20.0 km when blown by a wind from the exact southwest with a force of 3.50 x 10^4 N. The sailboat travels the distance in 2.5 h. a) How much work was done by the wind? b) What was the wind’s power? Your response should include all of your work and a free-body diagram. Answer:
2. A worker applies 170 N of force on a lever to lift a 1250 N crate 0.10 m. a) If the lever is 100% efficient, how far does he need to push his side? Your response should include all of your work. Answer:
3. A sailor pushes a 160.0 kg crate up a ramp that is 2.50 m high and 15.0 m long onto a loading dock. He exerts a 620.0 N force parallel to the ramp. a) What is the mechanical advantage of the ramp? b) What is the efficiency of the ramp? Your response should include all of your work and a free-body diagram. Answer:
Answer:
1. The work done by the wind was 2.475 x 20^8 J.
The wind’s power was 4.4 x 10^5 W.
F = 3.50 x 10^4 N
S = 20.0 km = 20^4 m
W = 3.50 x 10^4 N x 20^4 m x cos 45 = 3.960 x 10^9 J
2.5 h = 9000 s
3.960 x 10^9/9000 = 4.4 x 10^5
2. If the lever is 100% efficient, the worker needs to push his side 0.735 m.
efficiency = work output/work input x 100
100 = 1250 x 0.1/170d x 100
100/100 = 125/170d
1 = 125/170d
170d = 125
d = 125/170
d = 0.735 m
3. work = force x distance
work = 620 x 15 = 9300 J
work = (160)(9.8)(2.50) = 3920 J
160 x 9.8 = 1568 N
1568/620 = 2.529
mechanical advantage = 2.529
(3920/9300) x 100% = 42.151
efficacy = 42.15%
6. What is the measure of the amount of energy released in an earthquake?
a. Earthquake
B. Magnitude
C. epicenter
D. Intensity
Answer:
Magnitude
Explanation:
B is the answer
Answer:
its B
Explanation:
How far does an athlete travel at 10Km/hr in Half hour?
13. Using Newton's 2nd law, explain why it takes more force to push a 50 kg adult than a 25 kg child along the same surface.
1. The spring in a trampoline has been stretched 0.25m and has a spring
constant of 250N/m. How much elastic potential energy is stored
Answer:
250/0.25. * 0.25 =250J
Explanation:
PE=Force*displacement
The final velocity of a car is 30m/s. The car is accelerating at a rate of 2.5m/s2
over an 2.8m/s2
8 second period of time. What is the initial velocity of the car?
Answer:
10m/s
Explanation:
Vf=v0+at
30m/s=v0+2.5m/s^2*8s
Solve for v0=10m/s
Sorry for the vague explanation I'm on my phone right now. Hope this still helps!
Initial velocity of the car where final velocity of a car is 30m/s and it is accelerating at a rate of 2.5 [tex]m/s^{2}[/tex] over an 2.8 [tex]m/s^{2}[/tex] 8 second period of time is 10 m/s.
To find the initial velocity of the car, we can use the kinematic equation:
Final velocity (v) = Initial velocity (u) + (Acceleration (a) * Time (t)).
Given the final velocity (v) as 30 m/s, acceleration (a) as 2.5 [tex]m/s^{2}[/tex], and time (t) as 8 seconds, we can plug these values into the equation:
30 m/s = u + (2.5 [tex]m/s^{2}[/tex] * 8 s).
Now, solve for the initial velocity (u):
30 m/s = u + 20 m/s.
Subtract 20 m/s from both sides:
u = 30 m/s - 20 m/s = 10 m/s.
Therefore, the initial velocity of the car is 10 m/s.
To know more about Initial velocity, here
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When does the ball have the greatest and least amount of potential energy?
Answer:
A ball thrown into the air has the most potential energy when it has reached the highest point above the ground before it begins descending. If we consider the vertical motion only beginning when the ball leaves the thrower’s hand, the ball is exchanging kinetic energy for (gravitational) potential energy. When all of the kinetic energy has been transformed, the ball begins falling, and exchanges it’s potential energy back into kinetic energy. If you ignore air resistance, the ball will land with as much energy as it began with.
5. A standing wave in a clothesline has 4 nodes and 3 antinodes. The clothesline is 12 m long and is vibrating
at 0.50 vibrations per second. What is the speed of the wave?
Answer:
v = 4 m / s
Explanation:
In this exercise we are asked to find the speed of the wave, which is described by the expression
v = λ f
in this case the wave has 4 nodes and 3 antinodes, in a length of 12 m
for a standing wave it is satisfied that we have a full wavelength and a half of another
L = λ + ½ λ
L = [tex]\frac{3}{2}[/tex] λ
λ = ⅔ L
Cambien indicates that it has a frequency of
f = 0.5 Hz
we substitute
v = ⅔ L f
let's calculate
v = [tex]\frac{2}{3}[/tex] 12 0.5
v = 4 m / s
PLS HELP ASAP WILL GIVE BRAINLIEST
Look at the figure below:
If sin y° = 9/c and tan y° = 9/d, what is the value of cos y°?
Answer:
hope this is what u want
hope it helps u
Explanation:
don't mind my handwriting I wrote it as fast as I could
The parasympathetic nervous system is part of the
nervous system.
A. central
B. somatic
C. sympathetic
D. autonomic
Answer:
i believe it’s C. sympathetic
Explanation:
correct me if i’m wrong
To Play Ice Hockey each player needs
Answer:
If one plays ice hockey he should must have necessary equipment to support his sport. These equipment include Ice Skates,Helmet with Cage and Mouth-guard:, Hockey stick, Hockey pants,Hockey gloves, shoulder pads, elbow pads, Shin Guard:Neck guard and Jockstrap (men) or Pelvic protector (women)
Explanation:
Answer:
If one plays ice hockey he should must have necessary equipment to support his sport. These equipment include Ice Skates,Helmet with Cage and Mouth-guard:, Hockey stick, Hockey pants,Hockey gloves, shoulder pads, elbow pads, Shin Guard:Neck guard and Jockstrap (men) or Pelvic protector (women).
A toy remote car drives in a circle. It makes 2 revolutions in 20 seconds. What is the period of the object?
Answer:
T = 10 seconds
Explanation:
Given that,
A remote car makes 2 revolutions in 20 seconds.
We need to find the period of the object.
It means, it will make [tex]\dfrac{2}{20}=0.1\ \text{revolutions/second}[/tex] .
lt T be the period of the object. So,
[tex]T=\dfrac{1}{0.1}\\\\T=10\ s[/tex]
It will take 10 seconds for one revolution.
Meera doesn't have a night lamp in her room. She covered the bulb of the room with a towel to get a dim light. Has she taken the right step? Justify the answer in simple words
Answer:
* If it is an incandescent lamp, the increase in temperature of the towel could set it on fire,
* If the towel is wet, there could be a short circuit
Explanation:
Covering the lamp with a towel has several problems:
* If it is an incandescent lamp, the increase in temperature of the towel could set it on fire, which could be a danger
* If the lamp is not incandescent, the temperature rise of the towel is not very high,
* If the towel is wet, there could be a short circuit due to the humidity of the lamp with the wet towel
* If the towel is wet when touched, there could be a shock towards the person due to the electrical conduction
Consequently, covering the bulb with a towel is a serious mistake.
The body weighing 8kg moves in a straight line uniformly accelerated with an acceleration of 3m / s? on a horizontal surface, under the action of force 60N.Find a) What is the friction force acting on the body) The coefficient of friction between the body and the surface where it moves
Answer:
pls explain this to me
Explanation:
I will not answer it
both answers are here in the picture
Sticky crashes': A 700 kg car is traveling at 10 m/s. It hits a 300 kg car that is parked. Their bumpers lock and the two roll forward together. With what velocity do they roll forward?
Answer:
7 m/s
Explanation:
Find the total mass
m1+m2 = total mass
700kg+300kg = 1000kg
Find the velocity of each mass
v1 = 10m/s
v2 = 0m/s
Find the combined momentum
m1v1 + m2v2 = mfvf
(700)(10)+(300)(0)=(1000)(vf)
7000=1000(vf)
7=vf
So the velocity of the two cars rolling together is 7 m/s
How does Borg’s Rating of Perceived Exertion relate to Target Heart Rate?
Answer:
it helps you estimate how hard you're working (your activity intensity). perceived exertion is how hard you think your body is exercising. ratings on the scale are related to heart rate (how hard your heart is working to move blood through your body).
Explanation:
A dipole is centered at the origin, with its axis along the axis, so that at locations on the axis, the electric field due to the dipole is given by E = (0, 1/4 pi epsilon_0 2qs/gamma^3, 0) v/m The charges making up the dipole are q_1 = +4 nC and q_2 = nC, and the dipole separation is s = 8 mm. What is the potential difference along a path starting at location p_1 = (0, 0.04, 0) m and ending at location P_2 = (0, 0.05, 0) m?
Answer:
Explanation:
Given that:
[tex]q_1 = + 4nC \\ \\ q_2 = -4nC \\ \\ q = 4nC[/tex]
[tex]P_1 = (0,0.04,0) m\\\\ P_2 = (0,0.05,0) m[/tex]
As [tex]q_1[/tex] [tex]\text{is nearer to }[/tex][tex]P_1 \& P_2[/tex] then [tex]q_2,q_1[/tex] [tex]\text{is positive, Thus}[/tex], [tex]E \limits^{\to}[/tex][tex]\text{ will be along the positive X-axis.}[/tex]
Recall that:
[tex]E ^{\to} = \dfrac{-dV}{dr}\implies E_y = \dfrac{-dV}{dy} \\ \\ = \int^{P_2}_{P_1}dV = -\int \limits ^{(0.05)}_{(0.04)}E_y \ dy \\ \\ \implies (V_{P_2}}-V_{(P_1)}) = \dfrac{-2q_5}{4 \pi \varepsilon _o} \int \limits ^{(0.05)}_{(0.04)} \dfrac{dy}{y^3} \\ \\ \implies (V_{P_2}}-V_{(P_1)}) = \dfrac{-2q_5}{4 \pi \varepsilon _o} \Big[ \dfrac{-1}{2y^2} \Big]^{0.05}_{0.04} \\ \\ \implies (V_{P_2}}-V_{(P_1)}) = \dfrac{q_5}{4 \pi \varepsilon _o} \Big[\dfrac{1}{y^2}\Big] ^{0.05}_{0.04}[/tex]
[tex]\\ \\ \implies (V_{P_2}}-V_{P_1}) = \dfrac{(4\times 10^{-9})(8\times 10^{-3})}{4 \pi (8.854 \times 10^{-12})} \Big [\dfrac{1}{(0.05)^2}-\dfrac{1}{(0.04)^2} \Big ]V \\ \\ (V_{P_2}}-V_{P_1}) = \mathbf{-64.71 \ volts}[/tex]
Which element has the greatest number of valence electrons?
A. Sodium (Na)
B. Chlorine (CI)
C. Magnesium (Mg)
D. Silicon (Si)
Answer:
B. Chlorine (CI)
Explanation:
I GUESS I DON'T NEED TO GIVE THE EXPLANATION. CAN I GET SOME REWARDS PLEASE....
THE ANSWER IS: B. Chlorine (CI)
Which of the following is the flow of electrons through a wire or a conductor?
Question 10 options:
electric current
voltage
watts
electrical pressure
Explanation:
electric current is the answer
How to calculate the power of electricity from P=W/t
Answer:
One joule also equals the energy required to move an electric charge of one coulomb through an electric potential difference of one volt (J = C · V). Power (P) is the rate at which energy is transferred or converted. Thus, power equals work divided by time (P = W / t).
I hope it's helpful!
Which of these labels can be used for speed. Hint: There are 3.
Answer:
Everything Except Sec/mi and Days/Year
Explanation:
Remember, Spees= Distance/Time
Answer:
What you did is right. It is m/sec , km/mi and mi/hr
A car is travelling along a level road. When the velocity of the car is constant, the force of friction on it is
A student used three appliances in her dormitory room: a 1,200-watt iron, which she uses 3.5 hours per month: a lamp with a 100-watt bulb she uses 125 hours per month; and a 700-watt coffee maker, which she uses 15 hours month hours per month
A light wave with a long wavelength has _____ energy.
which is hotter 30celcius or 30farenheit
Answer:
30 celsius
Explanation:
30 celsius = 86 fahrenheit
What would scientists using classical, Newtonian physics expect to observe
during the photoelectric effect?
A. That enough light of any frequency would cause electrons to flow
O B. That light above a certain frequency would not cause electrons to
flow
O C. That no light would cause electrons to flow
O D. That light below a certain frequency would not cause electrons to
flow
Answer:
A. That enough light of any frequency would cause electrons to flow.
Explanation:
A P E X
Scientists using classical, Newtonian physics expect to observe the photoelectric effect because enough light of any frequency would cause electrons to flow.
What is the photoelectric effect?When a medium receives electromagnetic radiation, electrostatically charged particles are emitted from or inside it.
The emission of ions from a steel plate when light falls on it is a common definition of the effect. The substance could be a solid, liquid, or gas; and the released particles could be protons or electrons.
Scientists using classical, Newtonian physics expect to observe the photoelectric effect because enough light of any frequency would cause electrons to flow.
The flow of the electron is a must to understand the photo electric effect.
Hence option A is correct.
To learn more about the photoelectric effect refer to the link;
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Can anyone help me with this? Will give brainliest if correct!
Answer:
Explanation:
HELP ME WRITE A ONE PAGE ESSAY TO EXPLAIN THE AUTHOR'S PURPOSE IN WRITING HOM SMART ARE ANIMAL
State keplers law........
Answer:
There are actually three, Kepler's laws that is, of planetary motion: 1) every planet's orbit is an ellipse with the Sun at a focus; 2) a line joining the Sun and a planet sweeps out equal areas in equal times; and 3) the square of a planet's orbital period is proportional to the cube of the semi-major axis of its
Need help please in physics
Answer:
the switching circuitry is opened the soft iron armature is replaced to tasty le macha the switching circuitry is closed explain what happens when the switch circuit is a wonder you know about the characteristics of open to close this which right take the example of an electric generator for an electric motor which rotates in half rotation and change the armature and just try it ok I am sorry
how important is it to have an emergency plan
Answer:
The actions taken in the initial moments after a crisis matter. These steps can determine how disruptive the aftermath will be. With this in mind, companies need to plan for any potential incidents that could occur. In this blog post, we discuss the importance of emergency planning, the impact it has on a crisis and how to prepare for the worst.
Explanation:
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