Answer:
the friction force f=36
and the coefficient of friction =0.45
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%
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)
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
Rahul has 2 bulbs connected across two cells in a simple circuits shown. How can he make the bulbs glow dimmer?
Answer:
in the parallel connection the light bulbs shine less than in the series connection
Explanation:
In a series circuit the current through the whole circuit is the same, therefore the power (brightness) of each bulb is
P = i² R
where R is the resistance of each bulb and i the current of the circuit.
If we connect the light bulbs and the cells in parallel, the current in the circuit is the sum of the east that passes through each light bulb,
i = i₁ + i₂
if the two light bulbs are the same
i = 2 i₁
i₁ = i / 2
so the power of each bulb is is
P = i₁² R
P = R i² / 4
P = ¼ P_initial
Therefore we see that in the parallel connection the light bulbs shine less than in the series connection
Which of the following is an example of rolling friction?
O your shoes on a sidewalk as you walk
O bike tires on the road as you ride
a boat on the water as it sails
O two hands rubbing together
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!
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
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).
How to solve it? Three capacitors with capacities of 600 pF, 300 pF, 200 pF are connected in series. The 60 V voltage is applied to the group. Calculate the voltage on each capacitor. Answer: 10V, 20V, 30V.
Answer:
1. Voltage across 600 pF is 10 V.
2. Voltage across 300 pF is 20 V.
3. Voltage across 200 pF is 30 V.
Explanation:
We'll begin by calculating the total capacitance of capacitor. This can be obtained as follow:
Capicitance 1 (C₁) = 600 pF
Capicitance 2 (C₂) = 300 pF
Capicitance 3 (C₃) = 200 pF
Total capacitance (Cₜ) =?
1/Cₜ = 1/C₁ + 1/C₂ + 1/C₃
1/Cₜ = 1/600 + 1/300 + 1/200
1/Cₜ = 1 + 2 + 3 / 600
1/Cₜ = 6/600
1/Cₜ = 1/100
Cₜ = 100 pF
Next, we shall convert 100 pF to Farad (F). This can be obtained as follow:
1 pF = 1×10¯¹² F
Therefore,
100 pF = 100 pF × 1×10¯¹² F / 1 pF
100 pF = 1×10¯¹⁰ F
Thus, 100 pF is equivalent to 1×10¯¹⁰ F.
Next, we shall determine the charge. This can be obtained as follow:
Voltage (V) = 60 V
Capicitance (C) = 1×10¯¹⁰ F
Charge (Q) =?
Q = CV
Q = 60 × 1×10¯¹⁰ F
Q = 6×10¯⁹ C
1. Determination of the voltage across 600 pF.
Capicitance 1 (C₁) = 600 pF = 6×10¯¹⁰ F
Charge (Q) = 6×10¯⁹ C
Voltage 1 (V₁) =?
Q = C₁V₁
6×10¯⁹ = 6×10¯¹⁰ × V₁
Divide both side by 6×10¯¹⁰
V₁ = 6×10¯⁹ / 6×10¯¹⁰
V₁ = 10 V
2. Determination of the voltage across 300 pF.
Capicitance 2 (C₂) = 300 pF = 3×10¯¹⁰ F
Charge (Q) = 6×10¯⁹ C
Voltage 2 (V₂) =?
Q = C₂V₂
6×10¯⁹ = 3×10¯¹⁰ × V₂
Divide both side by 3×10¯¹⁰
V₂ = 6×10¯⁹ / 3×10¯¹⁰
V₂ = 20 V
3. Determination of the voltage across 200 pF.
Capicitance 3 (C₃) = 200 pF = 2×10¯¹⁰ F
Charge (Q) = 6×10¯⁹ C
Voltage 3 (V₃) =?
Q = C₃V₃
6×10¯⁹ = 2×10¯¹⁰ × V₃
Divide both side by 2×10¯¹⁰
V₃ = 6×10¯⁹ / 2×10¯¹⁰
V₃ = 30 V
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
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.
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which is hotter 30celcius or 30farenheit
Answer:
30 celsius
Explanation:
30 celsius = 86 fahrenheit
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
what is the gain in gpe when a brick of 2.00 kg is lifted up by 11.5 m
[ HELP NEEDED URGENTLY
Answer:
E = 225.4 J
Explanation:
Given that,
The mass of a brick, m = 2 kg
It is lifted up by 11.5 m
We need to find the gain in gravitational potential energy. The formula for gravitational potential energy is given by :
[tex]E=mgh\\\\E=2\times 9.8\times 11.5\\\\E=225.4\ J[/tex]
So, the gain in gravitational potential energy is 225.4 J.
does Bart Allen from the young justice show like men cause some one told me that watching season 3 and is the flash a bad guy for going back in time
Answer:
no
Explanation:
Which has more momentum? *
2 points
a ball of mass 2 kg moving at 30 m/s
a ball of mass 3 kg moving at 20 m/s'
a ball of mass 4 kg moving at 30 m/s
a ball of mass 5 kg moving at 20m/s
Answer:
4 kg at 30 m/s
Explanation:
comparing in pair, the 3rd is more than the 1st, and the 4th is more than the 2nd, so it boils down to the lasts two. calculate, and im pretty sure you get 4 kg at 30 m/s...
Momentum of a ball of mass 2 kg moving at 30 m/s = 2 kg × 30 m/s = 60 kg m/s
Momentum of a ball of mass 3 kg moving at 20 m/s = 3 kg × 20 m/s = 60 kg m/s
Momentum of a ball of mass 4 kg moving at 30 m/s = 4 kg × 30 m/s = 120 kg m/s
Momentum of a ball of mass 5 kg moving at 20 m/s = 5 kg × 20 m/s = 100 kg m/s
So, highest momentum is of a ball of mass 4 kg moving at 30 m/s (120 kg m/s).
The period of the sound waves produced by the motor is 8.3 milliseconds.
Calculate the frequency of the sound waves.
Answer:
120.48hz
Explanation:
f=1/t..........
Either the wavelength, velocity, or wave period—the amount of time it takes for a wave cycle to complete—must be known. If you know the period, divide 1 by it and, if necessary, convert it to seconds. The outcome will be the frequency in Hertz.
What frequency of the sound waves?As with all waves, the relationship between the speed of sound, its frequency, and its wavelength is vw=f, where vw is the speed of sound, f is the frequency, and is the wavelength.It is necessary to know either the wavelength, the velocity, or the wave period, which is the duration of a wave cycle.
Therefore, More oscillations are produced at higher frequencies. Hertz are the frequency measurement units (Hz). Noises between 20 Hz and 20,000 Hz can be heard by those with normal hearing. Ultrasound is a term for frequencies greater than 20,000 Hz.
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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
In each of the following cases, determine where the car has no
acceleration ?
1. A car shortly after a stoplight turns green
2. A car approaching a red light
3. A car with the cruise control set at 80 km/h
4. A car turning a curve at a reducing the speed
Help pls
Answer:
1.after
2.approaching
3.cruise
4.turning
Explanation:
if wrong sorry
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
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:
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
write the ratio of the following?
CaCO3
C2H6
Fe(NO3)3
Answer:
C2H6 up the road to be with its own in
A wave sent out from a source is reflected back
in 1x10 -3 sec. If the velocity of the wave
is 3x 10²m/s what is the distance of the reflecting
Surface from the source
Answer:
Hdgdjdiehebhsiducggdgdhduudhd
PLS ANSWER FAST WILL GIVE BRAINLY!!!! ONLY IF YOU KNOW!!!
Fill in the blanks
Iron has 26 protons, 26 electrons and an atomic mass of 56. How many neutrons are in iron?
Answer:
30 neutrons
Explanation:
A neutral iron atom contains 26 protons and 30 neutrons plus 26 electrons in four different shells around the nucleus. As with other transition metals, a variable number of electrons from iron's two outermost shells are available to combine with other elements.
A friend of yours left a pile of mail on a table. You notice your favorite magazine sticking out from under a package. You grab the magazine by its corner and get it from under the package. As you get your magazine, the package does not topple because
A- it has no acceleration
B-the force of gravity keeps it secured
C-it has inertia
D- a pair of action-reaction forces act on it
Answer:
d or b i think
Explanation:
i looked it up on go ogle :)
Answer:
b
Explanation:
sounds like it should be right
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.
A ball rolling at a speed of 4.30 m/s has a kinetic energy of 23.1 J. What is the mass of the ball?
PLEASE HELP
Answer:
Mass = 2.50 kilograms.
Explanation:
Given the following data;
Velocity = 4.3m/s
Kinetic energy = 23.1J
To find the mass of the ball;
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex] K.E = \frac{1}{2}MV^{2}[/tex]
Where;
K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents velocity measured in metres per seconds square.
Substituting into the equation, we have
23.1 = ½m*4.3²
46.2 = 18.49m
Mass, m = 46.2/18.49
Mass, m = 2.498 ≈ 2.50kg
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:
hope you like it
need help please and
PLEASE HELP PLEASEEEE
Answer:
Concave mirror
Explanation:
Because as we move the object far away from the mirror the image gets inverted