Homework Statement
2. The attempt at a solution
I integrated the velocity equation and got this: s(t)= sin(t) + (1/2)x
1. [sin(pi)+(1/2)(pi)] - [sin(0)+(1/2)(0)]
= pi/2
2. [sin(pi)+(1/2)(pi)] + [sin(0)+(1/2)(0)]
= pi/2
The first answer is right but the second one isn't
If I have a gear system that consist of 2 gears that are meshed together
the first has 16 teeth which is the driver and the 2nd has 36 teeths which is the follower,
power transmitted by the driver equal to 5 kw and the driver is rotating at 30 rps and has a known diameter, the usual way to...
Homework Statement
The pulley in the figure has radius 13.0 cm and a moment of inertia 0.230 kg m^2; the pulley is constructed from a dense metal. The rope does not slip on the pulley rim. The system is released from rest...
Homework Statement
A one-piece cylinder has a core section protruding from the larger drum and is free to rotate around its central axis. A rope wrapped around the drum of radius 1.14 m exerts a force of 4.41 N to the right on the cylinder. A rope wrapped around the core of radius 0.54 m...
Homework Statement
show that the charge distribution (|\vec{r}|\equiv r )
\rho(r) = Z\delta^3(\vec{r})-\frac{Ze^{-r/R}}{4\pi R^2r}
has zero net charge for any Z and R. Explain the meaning of Z.
Homework Equations
none given, but divergence (gauss) theorem and poisson's equation may...
Homework Statement
A boy of mass 60.0 kg is rescued from a hotel fire by leaping into a firefighter's net. The window from which he leapt was 8.0 m above the net. The firefighters lower their arms as he lands in the net so that he is brought to a complete stop in a time of 0.40 s.
1.What is...
Homework Statement
Imagine two spherical planets fixed on the x-axis, one with mass M at the origin, and the other with identical mass M at the position x = +d. (Assume that d is much greater than the radius of either planet.) At what position along the x-axis between the two masses could you...
Homework Statement
The masses and coordinates of three particles are as follows: 20.0 kg, (0.50, 1.00) m; 432.0 kg, (-1.00, -1.00) m; 71.0 kg, (0.00, -0.50) m. What is the gravitational force on a 20.0 kg sphere located at the origin due to the other spheres, magnitude and direction? Give...
Homework Statement
A sample of an ideal gas is taken through the thermodynamic cycle
shown on the P-V diagram at attached. Two of the “legs” of the cycle are
isobaric and the other two are isothermal.
a) Find the net work done by the gas along the high pressure isobaric
leg in terms...
Homework Statement
A 1200 kg pickup truck tows a small 300 kg trailer using a relatively lightweight tow rope. The position of the trailer is given in m and time in s. *There is an animation which shows the truck pulling the trailer across X-axis.
Given: x= -20; y= +1 **BTW, i don't know...
Homework Statement
A child drags a 20kg box across a lawn for 10m anfd along a sidewalk for 30m; the coefficient of friction is 0.25 for the first part of the trip and 0.55 for the second part. If the child always pulls horizontally, how much work does the child do on the box...
A 22 g bullet is fired from a rifle. It takes 2.55 10^-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 730 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet
m=22g
is a=0 ? since its...
The circular blade on a radial arm saw is turning at 265 rad/s at the instant the motor is turned off. In 12.0 s the speed of the blade is reduced to 85 rad/s. Assume the blade to be a uniform solid disk of radius 0.140 m and mass 0.400 kg. Find the net torque applied to the blade.
Relevant...
I have been working on the following two problems and I can't seem to get any progress.
Any help from anyone would be greatly appreciated. I know it seems simple to those who are familiar but I have no background in this type of equations.
1. A helicopter travels northwest 70.7 miles, then...
Homework Statement
You drag a(n) 15.8 kg steamer trunk over a rough surface by a constant force of 90.9 Nacting at an angle of 28.6? above the horizontal. You move the trunk over a distance of22.8 m in a straight line, and the coefficient ofkinetic friction is 0.18.
The acceleration of...
Homework Statement
A long straight rod has the following:
mass = 0.016 kg
length = 0.16 m
It is being pulled on by a force on its right end. The force pulls down on the rod, making an angle of 22.5 degrees with the vertical.
The magnitude of the force is 3.2E-2 N. Give the angular...
Homework Statement
A cylindrical shell of radius 8.1 cm and length 247 cm has its charge density uniformly distributed on its surface. The electric field intensity at a point 20.3 cm radially outward from its axis (measured from the midpoint of the shell ) is 41800 N/C.
Given: ke =8.99×10^9...
Homework Statement
The 'net force' in the statements below is the sum of ALL forces acting on the body.
True or False
1. During the collision of a car with a locomotive, the locomotive exerts an equal size force on the car as the car exerts on the locomotive.
2. If two objects have...
Homework Statement
a rubber ball mass of 0.08 kg bounces vertically on a concrete floor. the ball strikes the floor at 10 ms-1 and rebounds at 8 ms-1. The time in contact with the floor is 0.05 sec.
Calculate the average net force acting on the ball during the contact with the floor...
Homework Statement
Three tiny charged metal balls are arranged on a straight line. The middle ball is positively charged and the two outside balls are negatively charged. The two outside balls are separated by 20 cm and the middle ball is exactly halfway in between. The absolute value of the...
i keep getting this question wrong can some1 help
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two point charges located on the x axis: one charge, q1 = -16.0 , is located at x1= -1.650m ; the second charge, q2= 38.5nC , is at the origin x=0. A
3rd...
Homework Statement
q1 = 4 mC at the origin
q2 = 2 mC at x=1.0m y=0.0m
q3 = 1 mC at x=1.0m y= 1.0m
q4 = 3 mC at x=0.0m y= 1.0m
What is the net force on q2? Give magnitude and direction of the force.
Homework Equations
E = kq/r^2
E = F/qThe Attempt at a Solution
Ok after plotting the locations...
Homework Statement
A charge of -5.66 x 10-6 coulombs exists on each of the three spheres in the figure below. Sphere B is 0.364 meters from sphere A, and sphere C is 0.276 meters from sphere A.
b. Find the magnitude and direction of the net electric field at the location of sphere A...
Homework Statement
Find the electric field at the center of a square having side = 1m and having the following charges at each corner:
Q1:-1 x 10^-6
Q3: -2 x 10^-6
Q2: 2 x 10^-6
Q4: -1 x 10^-6
(Q1 is upper left corner, Q2 is upper right, q3 is lower left and Q4 is lower right)
Homework...
Homework Statement
A 3.3 μC point charge is on the x-axis at
x = 4.9 m, and a 3.9 μC point charge is on
the x-axis at x = 2.6 m.
The Coulomb constant is 8.98755 ×
109 Nm2/C2.
Determine the magnitude of the net electric
field at the point on the y-axis where y =
2.5 m.
Answer in units...
Homework Statement
The longest shish kebab ever made was 881.0 m long. Suppose the meat and vegetables need to be delivered in a cart from one end of this shish kebab’s skewer to the other end. A cook pulls the cart by applying a force of 40.00 N at an angle of 45.00° above the horizontal...
Homework Statement
During a tennis match, a player serves the ball at 23.4 m/s, with the center of the ball leaving the racquet horizontally 2.31 m above the court surface. The net is 12.0 m away and 0.900 m high. When the ball reaches the net, (a) what is the distance between the center of...
Homework Statement
A 2.80 kilogram mass is moving in a plane, with its x and y coordinates given by x = 4.50t2 - 1.15 and y = 2.90t3 + 1.95, where x and y are in meters and t is in seconds. Calculate the magnitude of the net force acting on this mass at t = 2.05 secondsHomework Equations...
Homework Statement
Two point charges lie on the x axis. A charge of -2.5 µC is at the origin, and a charge of +8.5 µC is at x = 10.0 cm.
What is the net electrical field at points x = +4 and at x = -4?
Homework Equations
E = kq/r^2
The Attempt at a Solution
For x = +4...
E=...
Homework Statement
four particles are fixed in place and have charges q1 = q2 = 3e, q3 = 7e, and q4 = -28e. Distance d = 6.7 µm. What is the magnitude of the net electric field at point P due to the particles?
Homework Equations
Im not sure what form of the magnitude equation to use for...
Homework Statement
A 2.60 kilogram mass is moving in a plane, with its x and y coordinates given by x = 5.40t2 - 1.30 and y = 2.75t3 + 1.80, where x and y are in meters and t is in seconds. Calculate the magnitude of the net force acting on this mass at t = 2.10 seconds.Homework Equations
Our...
We have been given three balanced equations to write as net ionic equations. Our teacher forgot to teach us this bit and has now left the college. I'm really stuck, any help would be so kindly appreciated TY x
The equations are:
1. Pb(NO3)2 (aq) + 2KCl (aq) = PbCl2(s) + KNO3 (aq)...
What average net force is required to stop...
1. a 1500 kg vehicle is traveling at 75km/h. what is the average net force required to stop the vehicle within a 4.0 second interval?
2. f=ma? but i don't know acceleration?
3. force = 1500x (75/4) ?
Homework Statement
A car is driven east for a distance of 43 km, then north for 29 km, and then in a direction 29° east of north for 24 km. Determine (a) the magnitude (in km) of the car's total displacement from its starting point and (b) the angle (from east) of the car's total...
Homework Statement
A 60.0-kg person, standing on a diving board, dives straight down into the water. Just before striking the water, her speed is 6.50 m/s. At a time of 1.75 s after entering the water, her speed is reduced to 1.10 m/s. What is the average net force (magnitude and direction)...
Homework Statement
A proton and an electron form two corners of an equilateral triangle of side length 5.3 x 10-6 m. What is the magnitude of the net electric field these particles produce at the third corner?
Homework Equations
E=kQ/r^2
The Attempt at a Solution
I drew a triangle...
Homework Statement
Two particles are fixed to an x axis: particle 1 of charge -1.23 x 10-7 C is at the origin and particle 2 of charge +1.23 x 10-7 C is at x = 15.5 cm. Midway between the particles, what is the magnitude of the net electric field?
Homework Equations
E=kQ/r^2 and/ or...
Homework Statement
A. Two particles having charges of 0.600 nC and 9.60 nC are separated by a distance of 1.60 m. At what point along the line connecting the two charges is the net electric field due to the two charges equal to zero?
B. Where would the net electric field be zero if one of...
1. Homework Statement
Two point charges q1 = -5.60 nC, and q2 = -14.0 nC are separated by 25.0 cm (see figure below).
http://www.webassign.net/yf12/21-p-031-alt.gif
(a) Find the net electric field these charges produce at point A
magnitude 10360 N/C
direction is to the right
(b)...
Homework Statement
Two point charges q1 = -5.60 nC, and q2 = -14.0 nC are separated by 25.0 cm (see figure below).
http://www.webassign.net/yf12/21-p-031-alt.gif
(a) Find the net electric field these charges produce at point A
magnitude 10360 N/C
direction is to the right
(b)...
Homework Statement
Find positions of four charges in a plane (+1C, -1C, +2C, -2C) that result in an equilibrium (zero net force on each charge). Report positions as four (x,y) pairs.
Homework Equations
F = \frac{k_{e}q_{1}q_{2}}{r^{2}}
The Attempt at a Solution
I had no idea...
Homework Statement
The figure shows two charged particles on an x axis: -q = -8.00 × 10-19 C at x = -1.50 m and q = 8.00 × 10-19 C at x = 1.50 m. What are the (a)x- and (b)y- components of the net electric field produced at point P at y = 5.00 m?
Homework Equations...
Homework Statement
http://online.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?courses/phys211/oldexams/exam3/sp08/fig10.gif
What's the net torques about the pivot, represented by the dot (•), in the diagram D. The solid arrows represent the magnitude and direction of the forces...
Sorry, not so much of a problem, more. . I need to understand.
Homework Statement
Finding the net head.
This website (http://www.oregon.gov/ENERGY/RENEW/Hydro/Hydro_index.shtml ), says that the gross or "static" head is the vertical distance between the top of penstock and the point...
Homework Statement
When calculating the net electric flux, we use the equation EA=electric flux. If there are multiple charges in different closed surfaces, do we use the net electric field multiplied by the area for each closed surface to solve the electric flux for a single closed object...
Homework Statement
http://img39.imageshack.us/img39/8019/92452636.jpg
Homework Equations
The Attempt at a Solution
i got -234 for the last part but it should be abs.value so 234.. but it didnt work.
is my work correct?
Homework Statement http://img8.imageshack.us/img8/8541/netforce.jpg
Homework Equations
The Attempt at a Solution
The forces on the left and right sides cancel. The forces on the top and bottom segments of the loop are in opposite directions, so the magnitudes subtract. So i...
Two charges are separated by 1.0 m. Q1 has a negative charge of 4.2 µC and Q2 has a positive charge of 1.4 µC. At what position is the net electric field that is produced by both Q1 and Q2 equal to zero?
Extra Credit: If a +5.0 µC charge is placed at this position, what force would act on it...