Answer:
The question is incomplete. However the complete question is :
A Rail Gun uses electromagnetic forces to accelerate a projectile to very high velocities. The basic mechanism of acceleration is relatively simple and can be illustrated in the following example. A metal rod of mass m and electrical resistance R rests on parallel horizontal rails (that have negligible electric resistance), which are a distance L apart. The rails are also connected to a voltage source V, so a current loop is formed.
The vertical magnetic field, initially zero, is slowly increased. When the field strength reaches the value [tex]$B_0$[/tex], the rod, which was initially at rest, begins to move. Assume that the rod has a slightly flattened bottom so that it slides instead of rolling. Use g for the magnitude of the acceleration due to gravity.
Find μs, the coefficient of static friction between the rod and the rails.
Express the coefficient of static friction in terms of variables given in the introduction.
So the answer is : [tex]$\mu_s=\frac{\Delta V LB_0}{Rmg}$[/tex]
Explanation:
It is given : B = [tex]$B_0$[/tex]
Therefore, using force on the current carrying wire is:
[tex]$\mu_s mg = B_0IL$[/tex]
[tex]$\mu_s= \frac{ILB_0}{mg}$[/tex]
Therefore,
[tex]$\mu_s=\frac{\Delta V LB_0}{Rmg}$[/tex]
The coefficient of static friction in terms of variables will be [tex]\rm \mu_s =\frac{ \triangle VLB_0}{Rmg} \\\\[/tex].
What is the cofficient of static friction?The ratio of the greatest static friction force (F) between the surfaces in contact before movement begins to the normal (N) force is the coefficient of static friction.
The given data in the problem is;
[tex]\rm B=B_0[/tex]
The force on a current-carrying wire is balanced by the friction force.
The force on a current-carrying wire is given by;
[tex]\rm \mu_s mg= B_0IL \\\\ \rm \mu_s=\frac{ILB_0}{mg}\\\\ \rm \mu_s= \frac{\triangle VLB_0}{Rmg}[/tex]
Hence the coefficient of static friction in terms of variables will be [tex]\rm \mu_s =\frac{ \triangle VLB_0}{Rmg} \\\\[/tex].
To learn more about the cofficient of static friction refer to;
https://brainly.com/question/17237604
What is the angle between a wire carrying an 8.00-A current and the 1.20-T field it is in if 50.0 cm of the wire experiences a magnetic force of 2.40 N? (b) What is the force on the wire if it is rotated to make an angle of 90 ∘ 90∘ with the field?
Answer:
(a) the angle between the wire and field is 30⁰
(b) the force is 4.8 N
Explanation:
Given;
current in the wire, I = 8 A
magnetic field, B = 1.2 T
length of the wire, L = 50.0 cm = 0.5 m
magnetic force, F = 2.4 N
The magnetic force on the wire is given by;
F = BILsinθ
where;
θ is the angle between the wire and field
sinθ = F / BIL
sinθ = 2.4 / (1.2 x 8 x 0.5)
sinθ = 0.5
θ = sin ⁻¹ (0.5)
θ = 30⁰
(b) the force on the wire if it is rotated to make an angle of 90⁰
F = BIL(sin90⁰)
F = BIL(1)
F = BIL
F = 1.2 x 8 x 0.5
F = 4.8 N
I need help with this science work.
Answer:
1. Radiation
2. Conduction
3. Conduction
4. Convection
5. Convection
6. Convection
7. Radiation
PLEASE HELPP WITH QUESTIONS :(
Answer:no
Explanation: lol
What is the net work, in joules, required to stop a bullet of mass 7.73 g that is moving at a speed of 409 m/s
Answer:
KE=1.58J
Explanation:
In this problem we are required to solve for the total energy
"The kinetic energy is the energy possessed by a body by virtue of motion"
KE=1/2mv²
Given
Mass m=7.73g
Velocity v=409m/s
In kg= 0.00773kg
KE=1/2*0.00773*409
KE=3.16157/2
KE=1.58J
How long will it take an object that falls from rest to attain a velocity of 147 m/s?
Answer:
15 seconds
Explanation:
We can use this formula to solve this problem:
Velocity = Initial Velocity + Acceleration * Time
We know that initial velocity is 0, the velocity is 147, and acceleration is 9.8(because of earth's gravitational pull), so we can plug those numbers in and solve for time:
147 = 0 + 9.8*t
t = 15
Therefore, it will take 15 seconds for an object that falls from rest to reach 147 m/s.
I WILL MARK YOU AS BRAINLIEST IF RIGHT
What is the magnitude of the net force acting on this object? And what direction?
Answer:
20N to the North
Explanation:
the west and east forces cancel out, that leaves us with 50 to the north, and 30 to the south, the difference would be 20 N to the North
A speeding car is traveling at a constant 30.0 m/s when it passes a sationary police car. If the police car delays for 1.00s before starting, what must be the magnitude of the constant accleration of the police car. pdf
Answer:
30.0m/s²Explanation:
Given
final speed v = 30.0m/s
initial velocity u = 0m/s
Time taken t = 1.00s
Required
constant acceleration of the police car a
Substitute the given parameters into this equation of motion
v = u + at
30 = 0 +1a
30 = a
a = 30.0m/s²
Hence the magnitude of the constant acceleration of the police car is 30.0m/s²
Determine the required height h of the crest of the roller coaster to thebottom so that when it is essentially at rest at the crest of the hill it will reacha speed of 28 m/s when it comes to the bottom.
Answer:
h = 40 m
Explanation:
Assuming no friction present, total mechanical energy must be conserved, so the following expression stands:ΔK + ΔU = 0 (1)Now, if the car is at rest at the crest of the hill, the change in kinetic energy is just as follows:[tex]\Delta K = \frac{1}{2} * m* v_{b} ^{2}[/tex] (2)
where vb = speed at the bottom = 28 m/s
If we define the bottom as our zero reference level for the gravitational potential energy, we can write the following equation:[tex]\Delta U = U_{f} - U_{i} = 0- m*g*h = -m*g*h[/tex] (3)
From (1) we get:ΔK = -ΔUReplacing by (2) and (3), we get:[tex]\frac{1}{2} * m* v^{2} = m*g*h[/tex]
Simplifying and rearranging terms, we can solve for h (height required) as follows:[tex]h = \frac{v_{b} ^{2} }{2*g} = \frac{(28m/s)^{2}}{2*9.8m/s2} = 40 m[/tex]
How do mass and the type of material affect thermal energy transfer?
Answer:
Warmer objects have faster particles and higher temperatures. If two objects have the same mass, the object with the higher temperature has greater thermal energy. ... Heat is the transfer of thermal energy between objects that have different temperatures.
2. Which is a non-example of matter?
Answer: there are multiple
Explanation:
light from a torch, the heat from a fire, and the sound of a police siren. You cannot hold, taste, or smell these things. They are not types of matter, but forms of energy.
A conveyor belt dumps 2500 yd3 of gravel to form a cone-shaped pile. How high could this pile of gravel be, and what could the circumference of the pile of gravel be at ground level
Answer:
Explanation:
Volume of the cone = 1/3πr²h
r is the radius
h is the height
2500 = 1/3πr²h
Criss multiply
r²h = 2500 × 3π
Rewrite the expression
r²h = 50² × 3π
Compare values
r² = 50²
r = √50²
r = 50yd
The radius is 50yards
Also;
h = 3π yards
h = 3(3.14)
h = 9.42yards
Hence the pile is 9.42yards high
Circumference of the pile = 2πr
Given r = 50
Substitute
Circumference = 2π(50)
Circumference = 100π
Circumference = 100(3.14)
Circumference = 314yards
Hence the circumference of the pile at the ground level is 314yards
If somebody asks me if i need help on my work and i say " no ty " , is that rude???
Answer:
no
Explanation:
A piece of pencil lead is connected in series with an ammeter and a power supply. The power supply is turned on. After a few minutes, although the potential difference across the pencil lead does not change, the current in the circuit increases significantly. Explain why the current increases.
Answer:
More electrons become free due to the potential which are charge carriers. More the charge carriers, more the current.
Current causes a heating effect. Resistance of lead decreases/ n increases [I=nAve]. Current increase
Explanation:
5.3C The nozzle on a fire hose is connected to the hose via a coupling. When the fire hose is in use with water flowing through it and the hose is stationary, the coupling is: a) in equilibrium, so there is no force on the coupling. b) in tension. c) in compression
Answer:
Tension ( B )
Explanation:
When the fire hose is in use with water flowing through it and the hose is stationary, the coupling is in TENSION , this is because the force of flow in a stationary object will be in a compressive nature that will in turn cause the force on the coupling to be in a form of a Tension ( i.e. Tensile )
Science Motion Problem pelase elp
Answer:120
Vav = S / t = (120 + 45) m / (4 + 60) sec = 2.6 m/s
Find the resistance that must be placed in series with a 25.0Ω25.0 Ω galvanometer having a 50.0µA50.0 μA sensitivity (the same as the one discussed in the text) to allow it to be used as a voltmeter with a 0.100-V full-scale reading
Answer:
1975 ohm
Explanation:
The maximum current that can pass through the galvanometer is 50.0µA
p.d across the galvanometer at a full scale deflection is given by
V = IR
V = (50.0×10^-6)*25
V1 = 1/800 or 0.00125volts
Since the p.d across the multiplier and galvanometer at full scale deflection is 0.100volts,the p.d across the multiplier alone must be given by
V2 = 0.100-0.00125
= 0.09875volts
Current passing through the multiplier is (50.0×10^-6)A
Hence if R is the resistance of the multiplier, we have that
V2 = (50.0×10^-6)×R
0.09875volts = (50.0×10^-6)×R
Divide both sides by 0.09875volts
R = 0.09875/(50.0×10^-6)
R =( 0.09875) ÷ 1/20000
R = 0.09875×20000
R = 1975 ohms
hello what is momentum?
Answer:
Momentum is vector quantity and it is defined as the product of mass of the object and velocity of the object.
As it is a vector quantity it has both direction and magnitude, and momentum is written as
p = m × v
p = momentum
m = mass of the object
v = velocity
Two kinds of momentum are there and they are:
Linear MomentumAngular MomentumWhat is one way radio waves are used?
А
to carry signals for televisions
B
to kill germs in hospitals
с
to treat cancer with radiotherapy
D
to take images of bones
Answer:
A
Explanation:
because it is used in tvs all the time
A water balloon is thrown horizontally with a
speed of 8.31 m/s from the roof of a building of
height H=23.0 m. How far does the balloon travel
horizontally before striking the ground? (Use the
vertical formula Av=v0v+1 2aw/2 to solve for time
and plug your components into the equation for
the horizontal direction Ar-vxt)
Your answer
Answer:
18mExplanation:
Given
speed of water balloon = 8.31m/s
Height of building = 23.0m
Required
Horizontal distance
First we need to get the time using the equation of motion
S = ut + 1/2at²
23 = 0+1/2(9.81)t²
23 = 4.905t²
t² = 23/4.905
t² = 4.689
t = √4.689
t = 2.17secs
Next is to get the horizontal direction expressed as:
Sh = Vxt
Sh = 8.31 * 2.17
Sh = 17.99m
Sh ≈ 18m
Hence the horizontal distance of the object before striking the ground is approximately 18m
A spacecraft is traveling in space at a velocity of 8200 m's. Turning a dial elicits the engines to accelerate the spacecraft at 2 m/s. How many seconds will it take
before the spacecraft reaches a velocity of 8400 m's?
How can humans detect infrared waves?
А
They see them as color.
B
They feel them as heat.
с
They hear them as sound.
D
They feel them as vibrations.
A bus is moving to the right at an absolute velocity U. You throw a water balloon at the bus at an absolute velocity V (greater than U) after the bus passes you. A person on the bus sees the balloon hit the bus at a speed of:
Answer:
The person on the bus will see the balloon hit the bus at a velocity = V - U
Explanation:
There is relative motion between the water balloon and the person sitting in the bus.
Relative motion is the motion of a body with respect to another body (eg. an observer) from the point of reference of the second body (observer).
The person on the bus has a velocity which is the same as that of the moving bus = U
The velocity of the thrown water balloon (greater than U) = V
The relative motion between the person and the water balloon is the difference between their velocities (since they are both moving in the same direction) = V - U
Therefore, the person on the bus will see the balloon hit the bus at a velocity = V - U
the whale shark is the largest of all fish and can have the mass of 3 adult elephants. suppose that a crane is lifting a whale shark into a tank for delivery to an aquarium. The crane must exert a force of 25000 N to lift the shark from rest. if the sharks acceleration equals 1.25m/s^2, what is the sharks mass ?
Answer: The whale shark is the largest type of fish in the world. Its mass can be as large as 2.00 x 10^4kg, which is the equivalent mass of three average adult elephants. Suppose a crane lifts a net with a 2.00 x 10^4kg whale shark off the ground. The net is steadily accelerated from rest over an interval of 2.5s until the net reaches a speed of 1.0 m/s.
Explanation:
Physics Freefall Name 1. You decide to drop a penny from the top of the hotel in New York. It hits a tourist in the head at 32 m/s. How far did the penny fall
Answer:
h = 52.24 m
Explanation:
Given that,
A penny is dropped from the top of the hotel in New York. It hits a tourist in the head at 32 m/s.
Let it falls at a height of h.
We can find the value of h using the conservation of energy such that,
[tex]\dfrac{1}{2}mv^2=mgh\\\\h=\dfrac{v^2}{2g}\\\\h=\dfrac{(32)^2}{2\times 9.8}\\\\h=52.24\ m[/tex]
So, it will fall at a distance of 52.24 m.
Problem 6 (20 points) A ballistic pendulum is a device often used for measuring the velocity of a projectile. Assume to projectile fully embeds itself in the pendulum. If the projectile mass is 25 grams, the pendulum mass is 2.5 kg, and the vertical displacement of the pendulum after the collision is 12 cm, find the velocity of the projectile just prior to the collision.
Answer:
The velocity of the projectile just prior to the collision is 154.934 meters per second.
Explanation:
Let consider the projectile-pendulum system as our system of study, from statement we know that projectile gives kinetic energy to the pendulum and turns into gravitational potential energy. By Principle of Energy Conservation we construct the following expression:
[tex]U_{g,1}+K_{1} = U_{g,2}+K_{2}[/tex] (Eq. 1)
Where:
[tex]U_{g,1}[/tex], [tex]U_{g,2}[/tex] - Initial and final gravitational potential energies, measured in joules.
[tex]K_{1}[/tex], [tex]K_{2}[/tex] - Initial and final kinetic energies, measured in joules.
By applying definitions of gravitational potential and kinetic energies, we expand and simplify the equation above:
[tex](m+M)\cdot g \cdot (y_{2}-y_{1}) = \frac{1}{2}\cdot (m+M)\cdot (v_{1}^{2}-v_{2}^{2})[/tex]
[tex]g\cdot (y_{2}-y_{1})=\frac{1}{2}\cdot (v_{1}^{2}-v_{2}^{2})[/tex]
And we clear the initial velocity of the pendulum-projectile system:
[tex]v_{1}=\sqrt{v_{2}^{2}+2\cdot g\cdot (y_{2}-y_{1})}[/tex] (Eq. 2)
Where:
[tex]m[/tex] - Mass of the projectile, measured in kilograms.
[tex]M[/tex] - Mass of the ballistic pendulum, measured in kilograms.
[tex]v_{1}[/tex], [tex]v_{2}[/tex] - Initial and final speeds of the pendulum-projectile system, measured in meters per second.
[tex]g[/tex] - Gravitational acceleration, measured in meters per square second.
[tex]y_{1}[/tex], [tex]y_{2}[/tex] - Initial and vertical position of the pendulum-projectile system, measured in meters.
Under the consideration of inellastic collision, we find the velocity of the projectile prior to the collision by Principle of Linear Momentum Conservation:
[tex]m\cdot v_{o, P} + M\cdot v_{o,B} = (m+M)\cdot v_{1}[/tex]
[tex]v_{o,P} = \frac{(m+M)\cdot v_{1}-M\cdot v_{o,B}}{m}[/tex] (Eq. 2)
Where:
[tex]v_{o, P}[/tex] - Velocity of the project prior to the collision, measured in meters per second.
[tex]v_{o,B}[/tex] - Velocity of the ballistic pendulum prior to the collision, measured in meters per second.
If we know that [tex]v_{2} = 0\,\frac{m}{s}[/tex], [tex]g = 9.807\,\frac{m}{s^{2}}[/tex], [tex]y_{2}-y_{1} = 0.12\,m[/tex], [tex]m = 0.025\,kg[/tex], [tex]M = 2.5\,kg[/tex] and [tex]v_{o,B} = 0\,\frac{m}{s}[/tex], then the velocity just prior to the collision is:
By (Eq. 1):
[tex]v_{1} =\sqrt{\left(0\,\frac{m}{s} \right)^{2}+2\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot (0.12\,m)}[/tex]
[tex]v_{1} \approx 1.534\,\frac{m}{s}[/tex]
By (Eq. 2):
[tex]v_{o,P} = \frac{(0.025\,kg+2.5\,kg)\cdot \left(1.534\,\frac{m}{s} \right)-(2.5\,kg)\cdot \left(0\,\frac{m}{s} \right)}{0.025\,kg}[/tex]
[tex]v_{o,P} = 154.934\,\frac{m}{s}[/tex]
The velocity of the projectile just prior to the collision is 154.934 meters per second.
A running back weighing 100 kg runs headlong into a defender weighing 120 kg. The two players are moving at 7 m/s and 5 m/s, respectively. Calculate the total momentum and the total kinetic energy of the system. [Calculations including velocity should reflect direction of travel.]
Answer:
Explanation:
we know that momentum is given as
P=mv
given data
P1=?
mass m1=100kg
velocity v1=7m/s
P2=?
mass m2=120kg
velocity v2=5m/s
the total momentum =P1+P2
total=m1v1+m2v2
total= 100*7+120*5
total=700+600
total= 1300kgm/s
total kinetic energy
KE total= 1/2m1v1^2+1/2m2v2^2
KE total= 1/2*100*(7)^2+1/2*120*(5)^2
KE total= 1/2*100*49+1/2*120*25
KE total= 1/2*4900+1/2*3000
KE total=2450+1500
KEtotal=3950 J
In which disorder does a person find it difficult to fall asleep or stay asleep for a long time?
A.
somnambulism
B.
narcolepsy
C.
insomnia
D.
sleep apnea
Answer:c
Explanation:
I have it
Answer:
C.
insomnia
Explanation:
plato answer
Two ropes are tied to a 50 kg boat. One pulls with a force of 120 N due West and the other rope pulls with a force of 140 N due South. Find the net force of the boat (magnitude and direction) and the acceleration.
The net force on the boat is the vector
F = (-120 N) i + (-140 N) j
where we take West and South to be the negative directions going left-and-right and up-and-down, respectively.
The magnitude of the net force is
F = √((-120 N)² + (-140 N)²) = 20 √(85) N ≈ 180 N
and its direction is
tan(θ) = (-140 N) / (-120 N) → θ ≈ -130°
relative to due East, or approximately 50° South of West.
PLS HELP PLS 10. This graph represents the velocity of an object over time. What is the average acceleration of the
object during the first 4 seconds?
Answer:
8 M/S
Explanation:
This is because the points match from 4 seconds (X) and it matches up to 8 (Y), therefore it went up 8 M/S in 4 seconds.
A biker pushes on the pedal and accelerates her 50 kg bike from 0 m/s to 10 m/s. What is the the impulse?
Answer:
3.7
Explanation:
