Tuesday

June 30, 2015

June 30, 2015

**physics**

A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s . As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s . Determine her initial rotational ...
*Monday, March 9, 2015 by Please Help*

**physics**

Determine the change in rotational kinetic energy when the rotational velocity of the turntable of a stereo system increases from 0 to 33 rpm. Its rotational inertia is 6.8×10−3kg⋅m2 .
*Monday, March 9, 2015 by Please Help*

**Physics**

A container with a one-liter capacity at 27 degree C is filled with helium to a pressure of 2 atm. how many moles of helium does it hold?
*Monday, March 9, 2015 by eddy*

**physics**

You need to lift a 200 kg box 5 meters, but it is too heavy. You decide to push it up an incline that makes a 25 degree angle with the ground. With what force do you need to push the box?
*Monday, March 9, 2015 by gal*

**physics**

Show that the kinetic energy of two particles with mass m1 and m2 split into the energy of the centre of mass and the kinetic energy of relative motion.
*Monday, March 9, 2015 by don*

**physics**

A car covers half a distance at a velocity of 80km/h and the other half at 60km/h,what is the average velocity of the car?
*Monday, March 9, 2015 by don*

**physics**

The drive propeller of a ship starts from rest and accelerates at 2.90×10-3 rad/s2 for 2.10×103 s. For the next 1.40×103 s the propeller rotates at a constant angular speed. Then it decelerates at 2.30×10-3 rad/s2 until it slows (without reversing ...
*Monday, March 9, 2015 by Jennifer*

**physics**

The sun has a mass of 1.99 × 1030 kg and is moving in a circular orbit about the center of our galaxy, the Milky Way. The radius of the orbit is 2.3 × 104 light-years (1 light-year = 9.5 × 1015 m), and the angular speed of the sun is 1.1 × 10-15 rad/s. ...
*Monday, March 9, 2015 by Jennifer*

**physics**

A motorcycle, which has an initial linear speed of 6.6 m/s, decelerates to a speed of 2.1 m/s in 5.0 s. Each wheel has a radius of 0.65 m and is rotating in a counterclockwise (positive) direction. What are a) the constant angular acceleration (in rad/s^2) and b) the angular ...
*Monday, March 9, 2015 by Jennifer*

**physics**

a person is pulling a 100 lb box across a smooth horizontal surface. what is the acceleration of the box if they are pulling upward at an angle of 20° with a force of 75 lbs Well, I know that there is no friction involved because it is a smooth surface and that n+TsinΘ...
*Monday, March 9, 2015 by Hanky*

**physics**

A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.875 m/s encounters a rough horizontal surface of length ℓ = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant ...
*Monday, March 9, 2015 by Ange*

**physics**

a 0.5KG ball is drop at concrete incline which is 45 degree above the horizontal then bounces off with the speed of 5m/s due to the force applied on it what is the change in its momentum?
*Monday, March 9, 2015 by musonda*

**physics**

a 0.5KG ball is drop at concrete incline which is 45 degree above the horizontal then bounces off with the speed of 5m/s due to the force applied on it what is the change in its momentum
*Monday, March 9, 2015 by musonda*

**Physics 1014**

A large bowl contains water 10cm deep and has a small electric lamp at the bottom.A disc of cardboard is floating on the surface with its centre vertically above the lamp,and is of such diameter that the lamp can just not be seen by a person looking into the water.calculate ...
*Monday, March 9, 2015 by Ntakadzeni*

**physics**

A bullet is fired with an initial velocity 300m s at an angle 30 degree with horizontal . At what distance from the gun will the bullet strike the ground ?
*Monday, March 9, 2015 by rajeev*

**Physics**

A 54.8 g ball of copper has a net charge of 2.5 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)
*Monday, March 9, 2015 by Carlos Montoya*

**physics for physical science **

A stone thrown vertically upwards with a speed of 12m/s from the edge of Cliff 70m high. Calculate the time the stone takes to hit the bottom of the cliff.
*Monday, March 9, 2015 by Justin *

**physics **

an object is placed 15 cm in front of a convex lens of focal length 10cm. Find the nature and position of the image formed. where should a concave mirror of radius of curvature 20cm be placed so that the final image is formed at the position of the object itself.
*Monday, March 9, 2015 by meenakshi*

**physics**

How many kilometers would you have to go above the surface of the earth for your weight to decrease to 39{\rm \\%} of what it was at the surface? Express your answer using two significant figures.
*Monday, March 9, 2015 by danny*

**physics**

A highway curve with radius 1000ft is to be banked so that a car traveling 56.0mph will not skid sideways even in the absence of friction At what angle should the curve be banked?
*Monday, March 9, 2015 by danny*

**physics **

A block (mass m) hangs from a spring (spring constant k). The block is released from rest a distance d above its equilibrium position. (a) What is the speed of the block as it passes through the equilibrium point? (Use any variable or symbol stated above along with the ...
*Sunday, March 8, 2015 by Eva*

**physics**

A war-wolf, or trebuchet, is a device used during the Middle Ages to throw rocks at castles and now sometimes used to fling pumpkins and pianos. A simple trebuchet is shown in the figure below. Model it as a stiff rod of negligible mass 3.00 m long and joining particles of ...
*Sunday, March 8, 2015 by amar *

**physics**

A boy throws a ball straight up into the air so that it leaves his hand at 11 m/s. If the ball has mass 0.15 kg and the boy's arm moved through 1.5 m as he threw the ball, then what average force did he exert on the ball?
*Sunday, March 8, 2015 by Anonymous*

**ap physics**

A student sits on a rotating stool holding two 3.8-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is 3.0 kg · m2 and...
*Sunday, March 8, 2015 by yesica*

**ap physics**

(a) Calculate the angular momentum of Earth that arises from its spinning motion on its axis, treating Earth as a uniform solid sphere. J · s (b) Calculate the angular momentum of Earth that arises from its orbital motion about the Sun, treating Earth as a point ...
*Sunday, March 8, 2015 by yesica*

**physics**

Each of the following objects has a radius of 0.169 m and a mass of 2.02 kg, and each rotates about an axis through its center (as in this table) with an angular speed of 38.6 rad/s. Find the magnitude of the angular momentum of each object. (a) a hoop kg · m2/s (b) a ...
*Sunday, March 8, 2015 by alba*

**Physics - Mini Lab**

The reason I didn't do this was because I was gone the day they did this at school. And the teacher said I couldn't do it at school. So I need help and my teacher is a jerk, so I have no idea what to do. Please help me. I really need a good grade in this class. Please...
*Sunday, March 8, 2015 by Marisa*

**Physics**

Continue walking at a constant speed. Just after you release the ball upward, make a sharp right turn. Where does the ball land?
*Sunday, March 8, 2015 by Marisa*

**Physics**

Continue walking at a constant speed. Just after you release the ball upward, break into a run. Where does the ball land?
*Sunday, March 8, 2015 by Marisa*

**Physics**

Continue walking at a constant speed. This time, stop instantly just after you release the ball upward. Where does the ball land?
*Sunday, March 8, 2015 by Marisa*

**Physics**

Newton's first law of motion states that an object in motion will continue to move at constant speed in a straight line. Only an outside force can change the speed or direction. If the object is at rest, it will remain at rest, unless an outside force is exerted on it. ...
*Sunday, March 8, 2015 by Marisa*

**physics**

A physics student pulls a block of mass m = 20 kg up an incline at a slow constant velocity for a distance of d = 4.5 m. The incline makes an angle Δ = 30° with the horizontal. The coefficient of kinetic friction between the block and the inclined plane is µk = ...
*Sunday, March 8, 2015 by sunny*

**Physics**

Charges of 4 µC are located at x = 0, y = 2.0 m and at x = 0, y = -2.0 m. Charges Q are located at x = 4.0 m, y = 2.0 m and at x = 4.0 m, y = -2.0 m. The electric field at x = 0, y = 0 is (4 ✕ 103 N/C) i. Determine Q.
*Sunday, March 8, 2015 by srdja*

**Physics**

A football player kicks with a speed of 21 m/s at 37 degree to the horizontal. How long is the ball in the air?
*Sunday, March 8, 2015 by Cullen*

**physics**

if a monochromatic beam of light with a wavelength of 590 nanometers is traveling through air then enters a region of space where the index of refraction is 1.5, what will the light beam do? increase, decrease, or stay the same?
*Sunday, March 8, 2015 by sue*

**Physics**

A 24.5-kg child is standing on the outer edge of a merry-go-round which has moment of inertia 989 kg • m2 and radius 2.40 m. The entire system is initially rotating at 0.180 rev/s. Find the angular velocity if the child moves to a final position 1.10 m from the center of ...
*Sunday, March 8, 2015 by Anonymous*

**physics**

calculate how far along the ground would the bicycle move if one of the wheels had an angular displacement magnitude of 500rev
*Sunday, March 8, 2015 by Sarah*

**physics**

If a bicycle moves 20m what is the angular displacement in degrees, revolution and radians?
*Sunday, March 8, 2015 by solomon*

**mathematics,physics,life science,LO,afrikaans**

A number of circles are given and the area of the smallest circles is 4π.The area of the next circle is 9/4 times of the previous circle.if there are 6 circles,determine the length of the diameter of the last circle.
*Sunday, March 8, 2015 by uchriciah*

**projectile motion physics**

There is a minimum angle above the ground such that if the ball is launched below this angle, it can never clear the bar, no matter how fast it is kicked. What is this angle?
*Sunday, March 8, 2015 by Kevin*

**Physics**

An exceptional standing jump would raise a person 0.90 m off the ground. To do this, what force must a person of mass 66 kg exert against the ground? Assume the person crouches a distance of 0.20 m prior to jumping, and thus the upward force has this distance to act before he ...
*Sunday, March 8, 2015 by Jrom*

**Physics**

A helicopter carrying Dr. Evil takes off with a constant upward acceleration of 5.0 m/s2. Secret agent Austin Powers jumps on just as the helicopter lifts off the ground. After the two men struggle for 10.0 s, Powers shuts off the engine and steps out of the helicopter. Assume...
*Sunday, March 8, 2015 by Ko*

**projectile motion physics**

Imagine the ball on the left is given a nonzero initial speed in the horizontal direction, while the ball on the right continues to fall with zero initial velocity. What horizontal speed vx must the ball on the left start with so that it hits the ground at the same position as...
*Sunday, March 8, 2015 by Kevin*

**physics**

A 310-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 25° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest? rad/s
*Sunday, March 8, 2015 by alba*

**physics**

A solid, uniform disk of radius 0.250 m and mass 60.4 kg rolls down a ramp of length 4.60 m that makes an angle of 18.0° with the horizontal. The disk starts from rest from the top of the ramp. (a) Find the speed of the disk's center of mass when it reaches the bottom ...
*Sunday, March 8, 2015 by mathew*

**physics**

A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 280 N applied to its edge causes the wheel to have an angular acceleration of 0.960 rad/s2. (a) What is the moment of ...
*Sunday, March 8, 2015 by alba*

**physics**

What is the force on the charge located at x = +8.00 cm in Figure 17.40(a) given that q = 5.00 n C and a = 7.00? (The positive direction is to the right.) N
*Sunday, March 8, 2015 by mathew*

**ap physics**

A beam resting on two pivots has a length of L = 6.00 m and mass M = 87.0 kg. The pivot under the left end exerts a normal force n1 on the beam, and the second pivot placed a distance ℓ = 4.00 m from the left end exerts a normal force n2. A woman of mass m = 54.0 kg ...
*Sunday, March 8, 2015 by amar *

**physics**

how much force is required to stop a 100 mi/hr fastball? Assume the catcher's mitt stops the ball in 1 millisecond and the mass of a baseball is 145 g.
*Saturday, March 7, 2015 by george*

**Physics**

Your parents have just bought you a new Canon digital camera. You wish to show your friends a picture of it, but you have no other cameras in the house. So you decide to stand 1.5 m in front of a flat mirror. For what distance should you focus your camera lens?
*Saturday, March 7, 2015 by Anonymous*

**Physics**

A 0.2 kg ball moves to the right with a speed of 3 m/s. It hits a 0.5 kg ball that at rest. After collision, the second ball moves to the right with a speed of 1 m/s. What is the speed of the first ball after collision?
*Saturday, March 7, 2015 by Please help*

**Physics**

A 0.02 kg ball moving to the right at 0.25 m/s makes an elastic head-on collision with a 0.04 kg ball moving to the left at 0.15 m/s. After the collision, the smaller ball moves to the left at 0.16 m/s. What is the velocity of the 0.04 kg ball after collision?
*Saturday, March 7, 2015 by Please help*

**Physics**

Carl hits a 0.05 kg golf ball giving it a speed of 65 m/s. What impulse does he impact to the ball?
*Saturday, March 7, 2015 by Please help*

**Physics**

A football is kicked at an angle of 40 degrees with an initial speed of 7 m/s. What is the horizontal distance traveled by the ball?
*Saturday, March 7, 2015 by Please help*

**Physics**

A volleyball is served at an angle of 35 degrees with an initial speed of 5 m/s. What is the maximum height reached by the ball?
*Saturday, March 7, 2015 by Please help*

**Physics**

A frisbee is thrown horizontally with a speed of 12 m/s. If the frisbee moves a horizontal distance of 15 m, how long will it stay in the air?
*Saturday, March 7, 2015 by Please help*

**physics**

A black and tackle with a velocity ratio of 5 is used to raise a mass of 25kg through a vertical distance of 40cm at a steady rate.if the effort is equal to 60N, determine a. The distance moved by the effort b. The work done by the effort in lifting the load
*Saturday, March 7, 2015 by abubakar*

**physics**

skater has a mass of 45 kg and is at rest. skater 2 has a mass of 50 kg and is moving along at a constant velocity of 3.2 m/s East. skater 3 has a mass of 75 kg and is moving quickly at a constant velocity of 9.6 m/s East. which state experiences the greatest force?
*Saturday, March 7, 2015 by ella*

**physics**

A car A is going north-east at 80km/h and another car B is going south-east at 60km/h. The direction of the relative velocity of A with B makes an angle of x with north find x
*Saturday, March 7, 2015 by shubham*

**physics**

A billiard ball moving at 4.0 m/s strikes a pair of billiard ball at rest. One of the ball moves off at 2.0 m/s in a direction 60 degrees from the line of motion of the first ball and the other moves off at 3.0 m/s in a direction 30 degrees from the line of the first ball on ...
*Saturday, March 7, 2015 by kezuya*

**physics **

a brass rod is 2 m long at a certain temperature. what is its length for a temperature rise of 100 K, if the expansivity of brass is 18 *10^-6K-1?
*Saturday, March 7, 2015 by Edward *

**physics**

A body accelerate from rest at (2m/s square) calculate its velocity after travelling 9m
*Saturday, March 7, 2015 by Mayowa*

**physics**

wo vectors A⃗ and B⃗ have magnitude A = 3.02 and B = 3.03. Their vector product is A⃗ ×B⃗ = -5.05k^ + 2.06 i^. What is the angle between A⃗ and B⃗ ?
*Saturday, March 7, 2015 by Kevin*

**Physics**

Kaitlin is going off to her physics class, jogging down the sidewalk at a speed of 3.30m/s . Her husband Scott suddenly realises that she left in such a hurry that she forgot her sandwich, so he runs to the window of their apartment, which is a height 35.0m above the street ...
*Saturday, March 7, 2015 by Kevin*

**Physics**

A car comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, so he decides to try leaping it with his car. The side the car is on is 19.5m above the river, while the opposite side is a mere 1.6m above the river. The river ...
*Saturday, March 7, 2015 by Kevin*

**Physics**

A 7500kg rocket blasts off vertically from the launch pad with a constant upward acceleration of 2.20m/s2 and feels no appreciable air resistance. When it has reached a height of 595m , its engines suddenly fail so that the only force acting on it is now gravity. [1]What is ...
*Saturday, March 7, 2015 by Kevin*

**physics**

A rigid tank having a volume of 0.100 m3 contains helium gas at 155 atm. How many balloons can be inflated by opening the valve at the top of the tank? Each filled balloon is a sphere 0.300 m in diameter at an absolute pressure of 1.15 atm. (Remember that the tank cannot be ...
*Saturday, March 7, 2015 by Anonymous*

**physics**

A transformer has N1=709turns in the primary coil and N2=1848turns in the secondary coil. If the input voltage is v(t)=218cos(Ωt) V, what rms voltage, in volts, is developed across the secondary coil?
*Friday, March 6, 2015 by Anne*

**physics**

An inductor (L=440mH), a capacitor (C=6.00μF), and a resistor (R=440Ω) are connected in series. A 75.0Hz ac generator produces a peak current of 255mA in the circuit. a) What is the impedance of the circuit? Answer in units of Ω
*Friday, March 6, 2015 by Anne*

**physics**

A 30.0μF capacitor is connected to an ac voltage source with an rms voltage of 150V and a frequency of 2.49KHz. What is the capacitive reactance of the circuit? Assume that there is no resistance in the circuit, and answer in units of ohms
*Friday, March 6, 2015 by Amy*

**physics**

Consider a purely inductive ac circuit in which the maximum voltage across the inductor is Vmax=98.0V. If the maximum current is 7.40A at 40.0Hz, what is the inductance L? Answer in mH.
*Friday, March 6, 2015 by Katie*

**physics**

At what force would a 16k object travelling at 25mph hit a stationery object
*Friday, March 6, 2015 by gemma*

**physics**

a 10-kg block on a perfectly smooth horizontal table is connected by a horizontal string to a 63-kg block that is hanging over the edge of the table. What is the magnitude of the acceleration of the 10-kg block when the other block is gently released?
*Friday, March 6, 2015 by Anonymous*

**math, physics**

The driver of a car traveling at 60 ft/sec suddenly applies the brakes. The position of the car is s(t) equals 60t minus - 1.5t^2, t seconds after the driver applies the brakes. How many seconds after the driver applies the brakes does the car come to a stop?
*Friday, March 6, 2015 by Gary*

**Physics**

A person walks first at a constant speed of 4.50 m/s along a straight line from point circled A to point circled B and then back along the line from circled B to circled A at a constant speed of 2.95 m/s. What is her average speed over the entire trip? I got 3.7 but it says it...
*Friday, March 6, 2015 by Marcus James*

**physics **

A charge q1 is inside a spherical surface (although not necessarily at the exact center of the sphere). A second charge q2 sits just outside the surface. Choose whether the following statements are true or false. T/F The total electric flux through the spherical surface ...
*Friday, March 6, 2015 by Samantha*

**physics**

A skier starts from rest at the top of a frictionless incline of height 20.0 m, as shown in the figure. At the bottom of the incline, the skier encounters a horizontal surface where the coefficient of kinetic friction between skis and snow is 0.208. Neglect air resistance.Find...
*Friday, March 6, 2015 by josef*

**physics**

A diver of mass m drops from a board 12.0 m above the water's surface, as shown in the figure. Neglect air resistance. Suppose the diver vaults off the springboard, leaving it with an initial speed of 3.96 m/s upward. Use energy conservation to find his speed when he ...
*Friday, March 6, 2015 by josef*

**Physics**

a siren has a frequency of 1099 Hz when it and an observer are both at rest. The observer then starts to move and finds that the frequency he hears is 1185 Hz. What is the speed of the observer?
*Friday, March 6, 2015 by Chad*

**Physics 1**

A man opens a 1.14-m wide door by pushing on it with a force of 49.5 N directed perpendicular to its surface. (a) What magnitude torque does he apply about an axis through the hinges if the force is applied at the center of the door? N · m (b) What magnitude torque does...
*Friday, March 6, 2015 by Gina*

**Physics 1**

A bicycle tire has a mass of 2.54 kg and a radius of 0.346 m. (a) Treating the tire as a hoop, what is its moment of inertia about an axis passing through the hub at its center? kg · m2 (b) What torque is required to produce an angular acceleration of 0.710 rad/s2? N &...
*Friday, March 6, 2015 by Gina*

**Physics **

A bowling ball of mass 7.45 kg is rolling at 2.56 m/s along a level surface. (a) Calculate the ball's translational kinetic energy. J (b) Calculate the ball's rotational kinetic energy. J (c) Calculate the ball's total kinetic energy. J (d) How much work would have...
*Friday, March 6, 2015 by Yesica *

**Physics **

A spinning wheel steadily slows from an initial angular velocity of 1.65 rev/s to 0.485 rev/s in 12.2 s. (a) Calculate the wheel's angular acceleration in radians per second squared. rad/s2 (b) What angle does it go through during that time? rad
*Friday, March 6, 2015 by Yesica *

**AP physics **

Solve the equations 1/2mv2 + 1/2Iω2 = mgh and v = rω for the speed v using substitution, given that I = mr2 and h = 4.20 m. (Note that mass m and radius r will both cancel, so their numerical values aren't required.) m/s
*Friday, March 6, 2015 by Amar*

**Ap physics**

The two conditions for equilibrium often result in a system of equations such as F1 + F2 = 44.0 N and 3.00F1 − 8.00F2 = 0. (Due to the nature of this problem, do not use rounded intermediate values in your calculations—including answers submitted in WebAssign.) (a) ...
*Friday, March 6, 2015 by Amar*

**physics**

A student, 90.0 m away from the foot of a cliff, claps her hands and hears the echo 0.50 s later. Calculate the speed of sound in the air.
*Friday, March 6, 2015 by Jay*

**Physics**

Carl hits a 0.05 kg golf ball giving it a speed of 65 m/s. What impulse does he impact to the ball?
*Friday, March 6, 2015 by Bill*

**Physics**

A car that slows down uniformly from 20 m/s to 5 m/s has an impulse of 30,000 kg m/s. Determine the mass of the car
*Friday, March 6, 2015 by Jut*

**Physics**

A Frisbee is thrown horizontally with a speed of 12 m/s. If the Frisbee moves a horizontal distance of 15 m, how long will it stay in the air?
*Friday, March 6, 2015 by Jhoy*

**Physics**

An orange rolls across a table with a speed of 0.5 m/s and falls off the edge. If it lands 3 m from the edge of the table, from what height does it fall?
*Friday, March 6, 2015 by Jin*

**Physics**

A package is dropped from a helicopter flying at a height of 7.5 m while traveling 15 m/s. How far is the package travel horizontally before it hits the ground below?
*Friday, March 6, 2015 by Pikto*

**Physics**

A gardener holds a hose 0.75 m above the ground such that water shoots out horizontally and hits the ground at a point 2 m away. What is the speed with which the water leaves the hose?
*Friday, March 6, 2015 by Hababa*

**physics**

A disk of mass m is spinning freely at 6.22 rad/s when a second disk of identical mass, initially not spinning, is dropped on it so that their axes coincide. In a short time the two disks are corotating. (The two disks have the same radius.) (a) What is the angular speed of ...
*Friday, March 6, 2015 by alba*

**physics**

A basketball player entertains the crowd by spinning a basketball on his nose. The basketball has a mass of 0.622 kg and a radius of 0.116 m. If the basketball is spinning at a rate of 7.00 revolutions per second, determine the following. Treat the ball as a thin, spherical ...
*Friday, March 6, 2015 by alba*

**physics**

A bowling ball of mass 7.45 kg is rolling at 2.56 m/s along a level surface. (a) Calculate the ball's translational kinetic energy. J (b) Calculate the ball's rotational kinetic energy. J (c) Calculate the ball's total kinetic energy. J (d) How much work would have...
*Friday, March 6, 2015 by alba*

**physics**

A bicycle tire has a mass of 2.54 kg and a radius of 0.346 m. (a) Treating the tire as a hoop, what is its moment of inertia about an axis passing through the hub at its center? kg · m2 (b) What torque is required to produce an angular acceleration of 0.710 rad/s2? N &...
*Friday, March 6, 2015 by alba*

**physics**

What is the magnitude of the angular acceleration of a 25.5-kg disk of radius 0.775 m when a torque of magnitude 41.5 N · m is applied to it? rad/s2
*Friday, March 6, 2015 by alba*

**physics**

A student rides his bicycle at a constant speed of 2.20 m/s along a straight, level road. If the bike's tires each have a radius of 0.338 m, determine the following. (a) What is the tires' angular speed? rad/s (b) What is the net torque on each tire? N · m
*Friday, March 6, 2015 by alba*

**physics**

A horizontal plank 4.12 m long and having mass 26.8 kg rests on two pivots, one at the left end and a second 1.03 m from the right end. Find the magnitude of the force exerted on the plank by the second pivot. N
*Friday, March 6, 2015 by alba*

**physics**

A mass of 1.50 kg is at (−2.55 m, 0) and a 2.04-kg mass at (4.00 m, 4.00 m). Find the center of mass of the system. ( m, m)
*Friday, March 6, 2015 by alba*