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August 20, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 7.40 g of condensation forms on a glass containing water and 210 g of ice, how many grams will melt as a result? Assume no other heat transfer occurs. Use the heat ...
Sunday, July 21, 2013 at 3:03am

physics
(a) How many kilograms of water must evaporate from a 60.0 kg woman to lower her body temperature by 0.750°C?
Sunday, July 21, 2013 at 3:02am

physics
The sun radiates like a perfect blackbody with an emissivity of exactly 1. (a) Calculate the surface temperature(K) of the sun, given it is a sphere with a 7.00 multiplied by 108 m radius that radiates 3.80 multiplied by 1026 W into 3 K space. (b) How much power(W/m^2)does the...
Sunday, July 21, 2013 at 3:01am

physics
a boy pushes with a force of 15 lbs. on a lawnmower handle which makes an angle 37 degree with the level ground. What is the horinzontal component of this force?
Sunday, July 21, 2013 at 2:52am

GCSE Physics
The energy value of gas used in a home is measured in KWH. The home owner has a prepayment meter and pays £30 into his account. With a prepayment meter, gas cost 15p per KWH. Use the below equation to calculate the total number of hours that the gas boiler would operate ...
Saturday, July 20, 2013 at 11:08pm

physics
a vertical spring with spring stiffness constant 305 n/m oscillates with an amplitude of 28.0 cm when 0.260 kg hangs from it. the mass passes through the equilibrium point (y=0) with positive velocity at t=0. (a) what equation describes this motion as a function of time? (b) ...
Saturday, July 20, 2013 at 11:07pm

Physics
The sun radiates like a perfect blackbody with an emissivity of exactly 1. (a) Calculate the surface temperature(K) of the sun, given it is a sphere with a 7.00 multiplied by 108 m radius that radiates 3.80 multiplied by 1026 W into 3 K space. (b) How much power(W/m^2)does the...
Saturday, July 20, 2013 at 10:05pm

physics
The "steam" above a freshly made cup of instant coffee is really water vapor droplets condensing after evaporating from the hot coffee. What is the final temperature of 200 g of hot coffee initially at 90.0°C if 2.00 g evaporates from it? The coffee is in a ...
Saturday, July 20, 2013 at 8:53pm

general physics
Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 6.3 x 1028 kg and 1.6 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this material, how much would...
Saturday, July 20, 2013 at 7:30pm

general physics
A solid concrete block weighs 160 N and is resting on the ground. Its dimensions are 0.400 m x 0.240 m x 0.0950 m. A number of identical blocks are stacked on top of this one. What is the smallest number of whole bricks (including the one on the ground) that can be stacked so...
Saturday, July 20, 2013 at 7:28pm

general physics
A meat baster consists of a squeeze bulb attached to a plastic tube. When the bulb is squeezed and released, with the open end of the tube under the surface of the basting sauce, the sauce rises in the tube to a distance h, as the drawing shows. Using 1.013 × 105 Pa for ...
Saturday, July 20, 2013 at 7:27pm

general physics
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 6.76 m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water?
Saturday, July 20, 2013 at 7:25pm

general physics
What is the smallest number of whole logs (ñ = 725 kg/m3, radius = 0.0556 m, length = 3.80 m) that can be used to build a raft that will carry four people, each of whom has a mass of 73.0 kg?
Saturday, July 20, 2013 at 7:22pm

physics
A full can of soda has a mass of 0.421 kg. It contains 3.57 x 10-4 m3 of liquid. Assuming that the soda has the same density as water, find the volume of aluminum used to make the can.
Saturday, July 20, 2013 at 7:21pm

physics
In 1986 a gargantuan iceberg broke away from the Ross Ice Shelf in Antarctica. It was approximately a rectangle 160 km long, 45.0 km wide, and 250 m thick. (a) What is the mass of this iceberg, given that the density of ice is 917 kg/m3? (b) How much heat is required to melt ...
Saturday, July 20, 2013 at 4:08pm

physics
The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.80 g of condensation forms on a glass containing water and 170 g of ice, how many grams will melt as a result? Assume no other heat transfer occurs. Use the heat ...
Saturday, July 20, 2013 at 3:56pm

Physics
On a certain dry sunny day, a swimming pool's temperature would rise by 1.60°C if not for evaporation. What fraction of the water must evaporate to carry away precisely enough heat to keep the temperature constant? (Lv =2430kJ/kg or 580kcal/kg)
Saturday, July 20, 2013 at 2:19pm

physics
The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.80 g of condensation forms on a glass containing water and 170 g of ice, how many grams will melt as a result? Assume no other heat transfer occurs. Use the heat ...
Saturday, July 20, 2013 at 2:14pm

physics
A slab of a thermal insulator with a cross-sectional area of 115 cm2 is 4.00 cm thick. It is made out of red brick with thermal conductivity 0.600 J/s∙m•C°. The temperature difference between opposite faces is 95.0 C°. Calculate the following: (a) The heat ...
Saturday, July 20, 2013 at 11:21am

Physics Lab
Collision derivation problem. A car is released from rest on a frictionless inclined plane. Assume h/L is approximately equal to y/x. equations. If the car has a mass of 0.2 kg, the ratio of height to width of the ramp is 11/110, the initial displacement is 2.25 m, and the ...
Saturday, July 20, 2013 at 6:18am

physics
A lighthouse standing on the top of a cliff is observed from two open boats (boats are not decked over) A and B in a vertical plane through the light house. The angle of elevation of the top of the lighthouse viewed from B is 16 degrees and the angles of elevation of the top ...
Saturday, July 20, 2013 at 2:24am

physics
The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 7.40 g of condensation forms on a glass containing water and 210 g of ice, how many grams will melt as a result? Assume no other heat transfer occurs. Use the heat ...
Friday, July 19, 2013 at 11:48pm

physics
An ice bag containing 0°C ice is much more effective in absorbing heat than one containing the same amount of 0°C water. (a) How much heat in kcal is required to raise the temperature of 0.700 kg of water from 0°C to 27.0°C? (b) How much heat is required to ...
Friday, July 19, 2013 at 11:03pm

physics
In 0.511 s, a 13.1-kg block is pulled through a distance of 3.13 m on a frictionless horizontal surface, starting from rest. The block has a constant acceleration and is pulled by means of a horizontal spring that is attached to the block. The spring constant of the spring is ...
Friday, July 19, 2013 at 10:01pm

physics
A 3.00 g lead bullet traveling at 640 m/s strikes a target, converting its kinetic energy into thermal energy. It's initial temperature is 40.0°C. (a)Find the available kinetic energy of the bullet.(J) (b)Find the heat required to melt the bullet.(J)
Friday, July 19, 2013 at 7:51pm

physics
Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 12 rubs a distance of 7.50 cm each and with a frictional force averaging 30.0 N, what is the temperature increase? The mass of tissue warmed ...
Friday, July 19, 2013 at 7:01pm

physics
The same amount of heat entering identical masses of different substances produces different temperature changes. Calculate the final temperature when 1.25 kcal of heat enters 1.25 kg of the following, originally at 20.0°C. (a) water (b) concrete (c) steel (d) mercury
Friday, July 19, 2013 at 5:02pm

physics
A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 200 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +4.0 m/s relative to the shore, and then hops onto an identical floating log that is ...
Friday, July 19, 2013 at 12:49pm

physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 ...
Friday, July 19, 2013 at 8:09am

physics
A clock is made out of a disk of radius R=10 cm which is hung by a point on its edge and oscillates. All of a sudden, a circular part right next to the hanging point of radius R2 falls off, but the clock continues oscillating. What is the absolute value of the difference in s ...
Friday, July 19, 2013 at 8:09am

Physics
What is the formula to find magnetic field at the centre of the solenoid of hollow iron core??
Friday, July 19, 2013 at 7:25am

physics
A 2.60 kg steel gas can holds 15.0 L of gasoline when full. What is the average density of the full gas can, taking into account the volume occupied by steel as well as by gasoline? Please show the steps, thanks.
Friday, July 19, 2013 at 2:07am

physics
A 2.60 kg steel gas can holds 15.0 L of gasoline when full. What is the average density of the full gas can, taking into account the volume occupied by steel as well as by gasoline?
Thursday, July 18, 2013 at 11:16pm

physics
A 2.60 kg steel gas can holds 15.0 L of gasoline when full. What is the average density of the full gas can, taking into account the volume occupied by steel as well as by gasoline?
Thursday, July 18, 2013 at 8:28pm

physics
A 2.60 kg steel gas can holds 15.0 L of gasoline when full. What is the average density of the full gas can, taking into account the volume occupied by steel as well as by gasoline?
Thursday, July 18, 2013 at 6:17pm

physics
A 1.80 m radius playground merry-go-round has a mass of 120 kg and is rotating with an angular velocity of 0.300 rev/s. What is its angular velocity after a 19.0 kg child gets onto it by grabbing its outer edge? The child is initially at rest.
Thursday, July 18, 2013 at 5:32pm

physics
A 1.80 m radius playground merry-go-round has a mass of 120 kg and is rotating with an angular velocity of 0.300 rev/s. What is its angular velocity(rev/s)after a 22.0 kg child gets onto it by grabbing its outer edge? The child is initially at rest.
Thursday, July 18, 2013 at 4:36pm

physics
A 2.60 kg steel gas can holds 15.0 L of gasoline when full. What is the average density(kg/m^3)of the full gas can, taking into account the volume occupied by steel as well as by gasoline?
Thursday, July 18, 2013 at 4:25pm

physics
The greatest ocean depths on earth are found in the Marianas Trench near the Philippines, where the depth of the bottom of the trench is about 11.0 km. Calculate the pressure(atm)due to the ocean at a depth of 10.1 km, assuming sea water density is constant all the way down...
Thursday, July 18, 2013 at 4:04pm

physics
A 2.60 kg steel gas can holds 15.0 L of gasoline when full. What is the average density of the full gas can, taking into account the volume occupied by steel as well as by gasoline?
Thursday, July 18, 2013 at 3:34pm

physics
A 2.60 kg steel gas can holds 15.0 L of gasoline when full. What is the average density of the full gas can, taking into account the volume occupied by steel as well as by gasoline?
Thursday, July 18, 2013 at 3:04pm

physics
The greatest ocean depths on earth are found in the Marianas Trench near the Philippines, where the depth of the bottom of the trench is about 11.0 km. Calculate the pressure due to the ocean at a depth of 10.1 km, assuming sea water density is constant all the way down. (The ...
Thursday, July 18, 2013 at 3:03pm

physics
Assume that the left side of your heart creates a pressure of 114 mm Hg by exerting a force directly on the blood over an effective area of 16.0 cm2. What force does it exert to accomplish this?
Thursday, July 18, 2013 at 3:00pm

Physics
HW9_1: AXIAL AND TRANSVERSE STRAINS - THE POISSON'S RATIO When no loads are applied, the isotropic elastic block depicted below is a cube of side L0=200 mm. When the distributed load (surface traction) q=200 MPa is applied as shown below, the side length along the ...
Thursday, July 18, 2013 at 2:41pm

physics
A rectangular gasoline tank can hold 44.0 kg of gasoline when full. What is the depth of the tank if it is 0.400 m wide by 0.900 m long?
Thursday, July 18, 2013 at 2:06pm

Physics
What are some careers that relate to waves and sound? Can you give some examples of how it's used please?
Thursday, July 18, 2013 at 11:49am

physics
A 33.5 kg block m1 is on a horizontal surface, connected to a 6.50 kg block m2 by a massless string. The pulley is massless and frictionless. A force of 213.7 N acts on m1 at an angle of 33.7o. The coefficient of kinetic friction between m1 and the surface is 0.201. Determine...
Thursday, July 18, 2013 at 11:46am

Physics
A bass guitar string produces a frequency of 460 Hz when plucked with no fingers on any of the frets. The same string is plucked again, with a finger placed halfway between the two ends. What frequency does it produce?
Thursday, July 18, 2013 at 11:44am

SCIENCE,PHYSICS
A thin ring with resistance R=10 Ω and self inductance L=0.2 H rotates with constant angular speed ω=100 rad/s in an external uniform magnetic field perpendicular to the rotation axis. As a result, the magnetic flux created by the external field varies with time as...
Thursday, July 18, 2013 at 10:26am

Physics
Two particles with charges +8e and -8e are initially very far apart (effectively an infinite distance apart). They are then fixed at positions that are 7.07 x 10-12 m apart. What is EPEfinal - EPEinitial, which is the change in the electric potential energy?
Thursday, July 18, 2013 at 5:31am

physics
Consider a beam as shown in the figure that is 2 m long and supported by a rope. It is pressed against the wall. There is no friction between the wall and the beam. If the beam has a mass of 2 kg and a sign with a mass of 10 kg is hung off of the end of the beam, can the ...
Thursday, July 18, 2013 at 12:49am

physics
A 1.80 m radius playground merry-go-round has a mass of 120 kg and is rotating with an angular velocity of 0.600 rev/s. What is its angular velocity after a 27.0 kg child gets onto it by grabbing its outer edge? The child is initially at rest.
Thursday, July 18, 2013 at 12:19am

physics
(a) Calculate the angular momentum of an ice skater spinning at 6.00 rev/s given his moment of inertia is 0.490 kg·m2. (b) He reduces his rate of spin (his angular velocity) by extending his arms and increasing his moment of inertia. Find the value of his moment of ...
Wednesday, July 17, 2013 at 11:24pm

physics
A 1.80 m radius playground merry-go-round has a mass of 120 kg and is rotating with an angular velocity of 0.300 rev/s. What is its angular velocity after a 22.0 kg child gets onto it by grabbing its outer edge? The child is initially at rest.
Wednesday, July 17, 2013 at 11:06pm

physics
runner goes from a standstill to a speed of 7.9 m/s in 14s. what is the acceleration of the runner?
Wednesday, July 17, 2013 at 9:30pm

physics
an automobile is travelling towards you at a speed 25.0m/s. When you measure the frequency of its horn, you obtain a value of 26Hz. If the actual frequency of the horn is known to be 240Hz, calculate speed of sound in air? answer is 325m/s
Wednesday, July 17, 2013 at 9:20pm

physics
As a train moves away from you, the frequency of its whistle is determined to be 475Hz. If the actual frequency was 500 Hz and the speed of sound in air is 350m/s, what is the Train's speed? answer is 18.4m/s please show and explain steps
Wednesday, July 17, 2013 at 9:06pm

physics
A airplane is approaching you at a speed of 360km/h. If you measure the pitch of its approaching engines to be 512 Hz, what must be the actual frequency of the sound of the engines? The speed of sound in air is 345m/s answer is 364Hz please explain steps?
Wednesday, July 17, 2013 at 9:05pm

general physics
A tank contains mercury, whose density is 13 600 kg/m3. Find the force exerted by the mercury on a circular plug at the bottom of the tank. The plug has a diameter of 2.54 cm, and is located 37.6 cm below the surface of the mercury.
Wednesday, July 17, 2013 at 7:01pm

Physics
A standing wave is generated in a 12.0 m wave tank using a frequency of 5.00 Hz. There are a total of four nodes in the standing wave (one on each end of the tank and two others between the ends). a) Sketch the wave in the tank. b) What is the velocity of the wave in the tank...
Wednesday, July 17, 2013 at 6:58pm

physics
no answer
Wednesday, July 17, 2013 at 2:49pm

physics
A clock is made out of a disk of radius R=10 cm which is hung by a point on its edge and oscillates. All of a sudden, a circular part right next to the hanging point of radius R/2 falls off, but the clock continues oscillating. What is the absolute value of the difference in s...
Wednesday, July 17, 2013 at 1:30pm

physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 ...
Wednesday, July 17, 2013 at 1:29pm

physics/science
An A.c circuit consist of 3uf capacitor and 500ohm resistor in series. If the current voltage applied is 12v and and frequency 50Hz. Calculate 1. Current though the circuit 2. Voltage accross the capacitor 3 phase angle 4 average power supplied 5 power factor
Wednesday, July 17, 2013 at 12:18pm

physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 ...
Wednesday, July 17, 2013 at 9:32am

Physics with Calc
A highway curve forms a section of a circle. A car goes around the curve as shown in the helicopter view of Figure P1.48. Its dashboard compass shows that the car is initially heading due east. After it travels 840 m, it is heading 35.0° south of east. Find the radius of ...
Wednesday, July 17, 2013 at 1:01am

Gen physics
A 55.0 kg high school baseball pitcher is holding a 149 g baseball as he slides horizontally on a frictionless surface with a velocity of +2.15 m/s, relative to the surface. He then throws the baseball with a velocity of +46.7 m/s relative to the surface. What is the player&#...
Tuesday, July 16, 2013 at 4:59pm

physics
A boy with a mass of 35.4 kg comes running up behind his stationary father, whose mass is 105.3 kg. If the boy’s velocity before the collision is 8.20 m/s eastward, and his father’s velocity after the collision is 3.10 m/s eastward, find the boy’s velocity after...
Tuesday, July 16, 2013 at 4:57pm

general physics
A piece of metal, when weighed in air, has a weight of 20.7 N. When completely submerged in blood (ĉ = 1060 kg/m3), the metal has a weight of 12.7 N. Based on the values from table 11.1 in the text, what is the most likely metal? Here is the answer but I need help ...
Tuesday, July 16, 2013 at 4:52pm

physics
A 48.0 kg child is stationary in the middle of an ice rink (no friction). A 0.750 kg football is thrown with a velocity of 21.2 m/s moving eastward. The child catches the ball and together they slide off in the eastward direction with a velocity of 0.326 m/s. Take east to be ...
Tuesday, July 16, 2013 at 4:47pm

physics
A 0.44-kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one, and the amount that the spring stretches from its unstretched length triples. What is the mass of the second block?
Tuesday, July 16, 2013 at 4:17pm

physics
A spring lies on a horizontal table, and the left end of the spring is attached to a wall. The other end is connected to a box. The box is pulled to the right, stretching the spring. Static friction exists between the box and the table, so when the spring is stretched only by ...
Tuesday, July 16, 2013 at 3:52pm

physics
A helicopter has two blades (see figure), each of which has a mass of 270 kg and can be approximated as a thin rod of length 6.7 m. The blades are rotating at an angular speed of 52 rad/s. (a) What is the total moment of inertia of the two blades about the axis of rotation? (a...
Tuesday, July 16, 2013 at 3:37pm

physics
The drawing shows the top view of two doors. The doors are uniform and identical. Door A rotates about an axis through its left edge, and door B rotates about an axis through its center. The same force is applied perpendicular to each door at its right edge, and the force ...
Tuesday, July 16, 2013 at 3:34pm

physics
A man holds a 194-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of the flexor muscle force , which is applied perpendicular to the forearm. The forearm weighs 24.7 N and has a center of gravity as indicated. ...
Tuesday, July 16, 2013 at 3:29pm

physics
The drawing shows a uniform horizontal beam attached to a vertical wall by a frictionless hinge and supported from below at an angle θ = 38o by a brace that is attached to a pin. The beam has a weight of 346 N. Three additional forces keep the beam in equilibrium. The ...
Tuesday, July 16, 2013 at 3:23pm

physics
One end of a meter stick is pinned to a table, so the stick can rotate freely in a plane parallel to the tabletop. Two forces, both parallel to the tabletop, are applied to the stick in such a way that the net torque is zero. The first force has a magnitude of 2.00 N and is ...
Tuesday, July 16, 2013 at 3:08pm

physics
An automobile tire has a radius of 0.335 m, and its center moves forward with a linear speed of v = 24.1 m/s. (a) Determine the angular speed of the wheel. (b) Relative to the axle, what is the tangential speed of a point located 0.243 m from the axle?
Tuesday, July 16, 2013 at 3:01pm

physics
A planet orbits a star, in a year of length 4.46 x 107 s, in a nearly circular orbit of radius 3.17 x 1011 m. With respect to the star, determine (a) the angular speed of the planet, (b) the tangential speed of the planet, and (c) the magnitude and direction of the planet'...
Tuesday, July 16, 2013 at 2:54pm

physics
A fan blade is rotating with a constant angular acceleration of +8.4 rad/s2. At what point on the blade, as measured from the axis of rotation, does the magnitude of the tangential acceleration equal that of the acceleration due to gravity?
Tuesday, July 16, 2013 at 2:50pm

physics
At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 5.95 m above the water. One diver runs off the edge of the cliff, tucks into a "ball," and rotates on the way down with an average angular speed of 2.55 rev/s. Ignore air ...
Tuesday, July 16, 2013 at 2:46pm

physics
A person is riding a bicycle, and its wheels have an angular velocity of 28.9 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is 13.6 revolutions. (a) How much time does it take for the bike ...
Tuesday, July 16, 2013 at 2:31pm

gen physics
Two masses, mA = 20.00 kg and mB= 12.00 kg, are 50.00 m apart. Find the location of the center of mass of the two masses, relative to mass A.
Tuesday, July 16, 2013 at 2:20pm

gen physics
An iron (ĉ = 7860 kg/m3) cube measuring 15.4 cm on a side is suspended from a wire. Find the tension in the wire when the block is completely submerged in water (ĉ = 1000 kg/m3).
Tuesday, July 16, 2013 at 2:19pm

Physics
A material that remains highly magnetized after a magnetization cycle has a large hysteresis area. Answer True False
Tuesday, July 16, 2013 at 2:16pm

Physics
In a magnetization cycle, a large hysteresis loop indicates ____. Answer the material is nonmagnetic a large amount of energy loss due to heating the size of the material is large the material will not remain well magnetized
Tuesday, July 16, 2013 at 2:15pm

Physics
The flux through a window whose surface is parallel to magnetic field lines is zero. Answer True False
Tuesday, July 16, 2013 at 2:15pm

Physics
A proton is traveling horizontally at 5.4 × 106 m/s in a direction 45o north of west. A magnetic flux density has a magnitude of 0.25 T and is directed north. What is the force on the proton? Answer 1.5 × 10-13 N, up 2.1 × 10-13 N, down 1.5 × 10-13 N, ...
Tuesday, July 16, 2013 at 2:14pm

Physics
A charged particle is projected into a uniform B-field. Its velocity vector is perpendicular to the B-field vector. What type of path will the particle travel? Neglect gravity. Answer straight line motion elliptical motion parabolic motion circular motion
Tuesday, July 16, 2013 at 2:14pm

Physics
A man stands underneath a power line carrying a current of 150 A. If the power line is 15 m above the man, what is the magnetic flux density measured by the man (Neglect the Earth's magnetic field).
Tuesday, July 16, 2013 at 2:13pm

physics
A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.170 rad/s2. After making 2870 revolutions, its angular speed is 131 rad/s. (a) What is the initial ...
Tuesday, July 16, 2013 at 2:08pm

physics
An automatic dryer spins wet clothes at an angular speed of 4.4 rad/s. Starting from rest, the dryer reaches its operating speed with an average angular acceleration of 4.2 rad/s2. How long does it take the dryer to come up to speed?
Tuesday, July 16, 2013 at 2:03pm

physics
Two people start at the same place and walk around a circular lake in opposite directions. One has an angular speed of 2.46 x 10-3 rad/s, while the other has an angular speed of 7.91 x 10-3 rad/s. How long will it be before they meet?
Tuesday, July 16, 2013 at 1:55pm

physics
A Ferris wheel rotates at an angular velocity of 0.28 rad/s. Starting from rest, it reaches its operating speed with an average angular acceleration of 0.021 rad/s2. How long does it take the wheel to come up to operating speed?
Tuesday, July 16, 2013 at 1:52pm

physics
A star rotates in a circular orbit about the center of its galaxy. The radius of the orbit is 4.4 x 1020 m, and the angular speed of the star is 7.3 x 10-15 rad/s. How long (in years) does it take for the star to make one revolution around the center?
Tuesday, July 16, 2013 at 1:45pm

physics
A pitcher throws a curveball that reaches the catcher in 0.67 s. The ball curves because it is spinning at an average angular velocity of 340 rev/min (assumed constant) on its way to the catcher's mitt. What is the angular displacement of the baseball (in radians) as it ...
Tuesday, July 16, 2013 at 1:25pm

physics
A hydraulic jack has an input piston with a diameter of 1.00 cm, and an output piston with a diameter of 6.00 cm. What weight (in N) can be lifted when a force of 45.8 N is applied to the input piston? Answer is 1650 N but I need someone walk me through the steps please.
Tuesday, July 16, 2013 at 1:05pm

physics
A tank contains mercury, whose density is 13 600 kg/m3. Find the force exerted by the mercury on a circular plug at the bottom of the tank. The plug has a diameter of 2.54 cm, and is located 37.6 cm below the surface of the mercury. The answer is 25.4 N but I don't know ...
Tuesday, July 16, 2013 at 1:02pm

physics
What mass would you hang on the right side of the system in the figure to balance it -- that is, to make the clockwise and counterclockwise torques equal? (Let x1 = 30 cm and x2 = 12 cm.)
Tuesday, July 16, 2013 at 12:36pm

Physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 ...
Tuesday, July 16, 2013 at 12:35pm

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