Saturday

November 22, 2014

November 22, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

A uniform solid ball rolls smoothly along a floor, then up a ramp inclined at 13.5 degrees. It momentarily stops when it has rolled 1.65 m along the ramp. What was its initial speed?
*Sunday, November 17, 2013 at 8:29pm*

**Physics**

In the figure, a small 0.458 kg block slides down a frictionless surface through height h = 1.05 m and then sticks to a uniform vertical rod of mass M = 0.458 kg and length d = 2.70 m. The rod pivots about point O through angle θ before momentarily stopping. Find θ.
*Sunday, November 17, 2013 at 8:28pm*

**physics**

Calculate how thick an absorber needs to be to absorb 25% of the incoming light using the Lambert-Beer law for absorption. How is the small gain coefficient k of a laser defined in relation to the absorption coefficient ƒÑƒ¯
*Sunday, November 17, 2013 at 7:53pm*

**physics**

A man seeking to set a world record wants to tow a 104,000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 93 kg, and the coefficient of static friction between his shoes and the runway is 0.78. What is the ...
*Sunday, November 17, 2013 at 5:59pm*

**physics**

Suzie (of mass 58 kg) is roller-blading down the sidewalk going 36 miles per hour. She notices a group of workers down the walkway who have unexpectedly blocked her path, and she makes a quick stop in 2 . 4 seconds. What is Suzie’s average acceleration?
*Sunday, November 17, 2013 at 4:10pm*

**PHYSICS HELP**

A pulley of mass mp , radius R , and moment of inertia about its center of mass Ic , is attached to the edge of a table. An inextensible string of negligible mass is wrapped around the pulley and attached on one end to block 1 that hangs over the edge of the table. The other ...
*Sunday, November 17, 2013 at 1:18pm*

**physics**

a wooding block of mass 7.6kg rest on a rough horizontal surface if the surface is 8N calculate the coefficient of friction
*Sunday, November 17, 2013 at 12:22pm*

**physics**

A wrecking ball (weight = 4880 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3520 N. As the drawing below shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is θ1...
*Sunday, November 17, 2013 at 10:06am*

**Physics**

two hundred fifty grams of iron is heated from 27 degree Celsius to 300 degree Celsius . how much ice can be melted and raised to a temperature of 27 degree Celsius by hot iron?
*Sunday, November 17, 2013 at 4:59am*

**Physics**

An electric heater warms a large 0 degree Celsius block of ice at the rate of 200J/s . calculate the mass of the ice that melts in 10 minutes
*Sunday, November 17, 2013 at 4:56am*

**PHYSICS**

A flat loop of wire consisting of a single turn of cross-sectional area 8.10 cm2 is perpendicular to a magnetic field that increases uniformly in magnitude from 0.500 T to 1.90 T in 0.95 s. What is the resulting induced current if the loop has a resistance of 2.80 ?
*Saturday, November 16, 2013 at 11:59pm*

**Science (Physics)**

On the moon, the acceleration due to gravity is only 1.6 m/s/s. If someone on earth can throw a baseball 24.2 m high, how high could she throw it on the moon?
*Saturday, November 16, 2013 at 10:36pm*

**Physics**

A block of mass m1 = 4.90 kg sits on top of a second block of mass m2 = 14.5 kg, which in turn is on a horizontal table. The coefficients of friction between the two blocks are µs = 0.300 and µk = 0.100. The coefficients of friction between the lower block and the ...
*Saturday, November 16, 2013 at 6:27pm*

**physics**

A 0.355-kg object undergoing SHM has ax = 2.30 m/s2 when x = 0.235 m. What is the time for one oscillation?
*Saturday, November 16, 2013 at 3:13pm*

**Physics**

A 4 kg puck can slide with negligible friction over a horizontal surface, taken as the xy plane. ˆ The puck has a velocity of 3i m / s at one instant ti = 0 . Eight seconds later, its velocity is to be ˆˆ 8i+10 j m / s . Find the magnitude and direction of the ...
*Saturday, November 16, 2013 at 12:50pm*

**physics**

a toy rocket is fired upward with a net force of 50N. Because of this force it accelerates at 25m/s^2. What is the mass of the rocket?
*Saturday, November 16, 2013 at 12:23pm*

**Physics**

When 140000 joules of heat is removed from 0.60kg of water initially at 20Celsius, will all the water freeze? If not how much remains unfrozen
*Saturday, November 16, 2013 at 10:58am*

**physics**

why convex lens forms sn inverted image?
*Saturday, November 16, 2013 at 10:13am*

**Physics **

The maximum possible value for the coefficient of static friction ?
*Saturday, November 16, 2013 at 7:58am*

**Physics**

An 100kg box is placed on the ramp. As one end on the ramp is raised the box begin to move down ward just as the angle of inclination reaches 15 degree . What the coeffenict of static friction between box and ramp .. ?
*Saturday, November 16, 2013 at 7:41am*

**Physics **

A500 man stands at the center of the rope such that each half of the ropes makes an angle of 10 with the horizentle . What is the tension of the rope ???
*Saturday, November 16, 2013 at 7:08am*

**Physics **

A15N crate rests on an ramp , the maximum angle just before it slips is 25 degree with the horizantle , what the coefficient of static friction between the crate and ramp surfaces ?
*Saturday, November 16, 2013 at 6:49am*

**Physics **

Acceleration due to gravity on the moon's surface is 1/6th that on the earth . An object weight 900N on the earth . What does it weight on the moon ?
*Saturday, November 16, 2013 at 5:42am*

**physics **

A planet A of mass m is in a circular orbit of radius "a" around a star ( M_star >> m ). Another planet B with the same mass m is in an elliptical orbit around the same star with its length of the semi-major axis equal to "a" . We have just learned ...
*Friday, November 15, 2013 at 8:59pm*

**Physics**

A 1000N crate is being pushed across a level floor at a constant speed by a force F of 300N at an angle of 20.0 degrees. (a) What is the coefficient of kinetic friction between the crate and the floor? (b) If the 300-N force is instead pulling the block at an angle of 20.0 ...
*Friday, November 15, 2013 at 7:15pm*

**physics **

The angular momentum of a planet is conserved if taken with respect to: a)The center of the ellipse b) The focus of the ellipse at the sun c)The focus of the ellipse opposite the sun d)Both foci of the ellipse
*Friday, November 15, 2013 at 7:10pm*

**Physics please HELP**

A planet A of mass m is in a circular orbit of radius "a" around a star ( M_star >> m ). Another planet B with the same mass m is in an elliptical orbit around the same star with its length of the semi-major axis equal to "a" . We have just learned ...
*Friday, November 15, 2013 at 7:06pm*

**Physics**

A 153 g bullet is fired from a rifle having a barrel 0 . 794 m long. Assuming the origin is placed where the bullet begins to move, the force exerted on the bullet by the expanding gas is F = a + bx − cx 2 , where a = 12600 N, b = 8420 N / m, c = 10100 N / m 2 , with x ...
*Friday, November 15, 2013 at 3:09pm*

**Physics**

A ball, of mass 0.3Kg, is held on the inside of a smooth hemispherical bowl at a height 0.09 m above the base. It is then released. Assuming there is no friction, the acceleration due to gravity, g, is 10 m/s2 and the potential energy is zero at the base of the bowl - What is ...
*Friday, November 15, 2013 at 2:27pm*

**Physics**

In a slide caliperse 99 divisions of main scale is equal to 100 divisions of vernier scale.Determine the vernier constant.
*Friday, November 15, 2013 at 12:21pm*

**physics**

Starting from rest, a(n)9 kg block slides 9.7 m down a frictionless ramp (inclined at 30◦ from the ﬂoor) to the bottom. The block then slides an additional 23.5 m along the ﬂoor before coming to stop. The acceleration of gravity is 9.8 m/s 2.Find the speed ...
*Thursday, November 14, 2013 at 11:26pm*

**physics**

Two forces act on an object. The first force has a magnitude of 17.0 N and is oriented 68.0° counter-clockwise from the x axis, while the 2nd force has x- and y-components (-19.0 N, 16.5 N). Express the magnitude and direction of the net force.
*Thursday, November 14, 2013 at 10:38pm*

**Physics**

Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 93.3 N, Jill pulls with 73.1 N in the northeast direction, and Jane pulls to the southeast with 181 N. (Since the donkey is involved with such uncoordinated people, who can blame it for ...
*Thursday, November 14, 2013 at 10:38pm*

**Physics**

A 14.9-kg object hangs in equilibrium at the end of a rope (taken as massless) while a wind pushes the object with a 67.7-N horizontal force. Find the tension in the rope and the rope\'s angle from the vertical. The acceleration due to gravity is 9.81 m/s2.
*Thursday, November 14, 2013 at 10:37pm*

**Physics**

To better understand the concept of static equilibrium a laboratory procedure asks the student to make a calculation before performing the experiment. The apparatus consists of a round level table in the center of which is a massless ring held in place with a pin. There are ...
*Thursday, November 14, 2013 at 10:36pm*

**physics **

A metal wire has a resistance of 8 ohm at a temperature of 20 degree celcius . If the same wire has a resistance of 8.40 ohm at 70 degree celcius , what is the resistance of this wire in ohms when its temperature is -10 degree celcius ?
*Thursday, November 14, 2013 at 10:16pm*

**physics **

A metal wire has a resistance of 8 ohm at a temperature of 20 degree celcius . If the same wire has a resistance of 8.40 ohm at 70 degree celcius , what is the resistance of this wire in ohms when its temperature is -10 degree celcius ?
*Thursday, November 14, 2013 at 10:15pm*

**physics**

a car moving at 22.0 m/s strikes a large tree and comes to rest in a distance of 1.55m. assuming negative acceleration. what is the time needed to stop the car? what is the average acceleration
*Thursday, November 14, 2013 at 9:49pm*

**Physics**

A stone is aimed at a cliff of height h with an initial speed of v = 56.0 m/s directed 65.0° above the horizontal, as shown in the Figure below by the arrow. The stone strikes at A, 9.20 s after launching. What is the height of the cliff?
*Thursday, November 14, 2013 at 8:56pm*

**Physics**

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Thursday, November 14, 2013 at 8:54pm*

**Physics**

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Thursday, November 14, 2013 at 8:45pm*

**Physics**

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Thursday, November 14, 2013 at 8:45pm*

**Physics**

After a completely inelastic collision, two objects of the same mass and same initial speed are found to move away together at 1/5 their initial speed. Find the angle between the initial velocities of the objects.
*Thursday, November 14, 2013 at 8:30pm*

**physics**

A 160 kg child jumps at 7 m/s into a boat floating a rest. After the jump, they both move at 3 m/s forward. Find the boat's mass.
*Thursday, November 14, 2013 at 8:20pm*

**Physics**

A 1000N crate is being pushed across a level floor at a constant speed by a force F of 300N at an angle of 20.0 degrees. (a) What is the coefficient of kinetic friction between the crate and the floor? (b) If the 300-N force is instead pulling the block at an angle of 20.0 ...
*Thursday, November 14, 2013 at 6:39pm*

**Physics Help!! I'm so confused!!!**

A fire hose sprays 450 liters of water a minute onto a fire with a velocity of 17.0 m/s. Water has a density of 1 kg/liter. What is the average force acting on the fireman holding the hose due to the water? PLEASE EXPLAIN.
*Thursday, November 14, 2013 at 6:36pm*

**Physics **

A billiard ball with mass 0.210 kg has a speed of 5.2 m/s and collides completely inelastically with another ball of the same size and mass. I understood the first part of the problem I just need help solving the second part. Another billiard ball traveling at 6.25 m/s ...
*Thursday, November 14, 2013 at 6:24pm*

**physics**

A 2.20kg mass is attached to a spring and placed on a horizontal, smooth surface. A horizontal force of 21.3N is required to hold the mass at rest when it is pulled 0.190m from its equilibrium position (the origin of the x axis). The mass is now released from rest with an ...
*Thursday, November 14, 2013 at 6:01pm*

**Physics**

1. A gold atom has a mass of 3.287 • 10-25 kg and is at rest. It emits an alpha particle that has a mass of 6.646 • 10-27 kg. In this process, the gold atom is transformed into an iridium isotope. The alpha particle has a speed of 3.40 • 106 m/s. A. What is the ...
*Thursday, November 14, 2013 at 6:00pm*

**Physics**

A car traveling at a velocity of 24 m/s is accelerated uniformly at a rate of 2 m/s¶ for 8 seconds. What is the final velocity of the car?
*Thursday, November 14, 2013 at 5:07pm*

**Physics**

Police find skid marks 180 meters long on a highway where a car made an emergency stop. Assuming that the deceleration was a = 10 m/s¶ (about the maximum for dry pavement), how fast was the car traveling before the brakes were applied?
*Thursday, November 14, 2013 at 5:00pm*

**Physics**

A liquid of density 1.23 × 103 kg/m3 flows steadily through a pipe of varying diameter and height. At location 1 along the pipe the flow speed is 9.23 m/s and the pipe diameter is 1.07 × 101 cm. At location 2 the pipe diameter is 1.71 × 101 cm. At location 1 ...
*Thursday, November 14, 2013 at 3:15pm*

**PHYSICS (HELP)**

A gyroscope consists of a uniform disc of mass radius M= 1 kg and radius R= 0.1 m . The disc spins with an angular speed ω= 300 rad⋅s-1 as shown in the figure below. The gyroscope precesses, with its axle at an angle 30∘ below the horizontal (see figure). The ...
*Thursday, November 14, 2013 at 2:50pm*

**physics**

What net torque is required to give a uniform 12-kg solid ball with a radius of 0.22m an angular acceleration of 12rad/s2 ?
*Thursday, November 14, 2013 at 2:31pm*

**physics**

A charged particle of mass 8.39×10−4 kg starts from rest and accelerates through a potential difference of +25,000 V to reach a speed of 1170 m/s. What is the charge on this particle?
*Thursday, November 14, 2013 at 1:38pm*

**physics**

You walk 51 m to the north, then turn 30° to your right and walk another 45 m. How far are you from where you originally started?
*Thursday, November 14, 2013 at 12:28pm*

**physics**

The position of a particle moving along the x axis is given by x=3.0t^2 - 1.0t^3 , where x is in meters and t in seconds. What is the position of the particle when it achieves its maximum speed in the positive x direction
*Thursday, November 14, 2013 at 11:41am*

**physics**

A 1700 kg car moving south at 19.5 m/s collides with a 2050 kg car moving north. The cars stick together and move as a unit after the collision at a velocity of 5.16 m/s to the north. Find the velocity of the 2050 kg car before the collision. m/s to the north
*Thursday, November 14, 2013 at 11:05am*

**Physics Classical Mechanics**

A gyroscope consists of a uniform disc of mass radius M= 2 kg and radius R= 0.2 m . The disc spins with an angular speed ω= 300 rad⋅s-1 as shown in the figure below. The gyroscope precesses, with its axle at an angle 30∘ below the horizontal (see figure). The ...
*Thursday, November 14, 2013 at 9:34am*

**Physics Classical Mechanics**

A satellite of mass m is orbiting the earth, mass M , in a circular orbit of radius ra . Unfortunately a piece of space debris left by a passing rocket lies directly in the satellite's path. The piece of debris has the same mass m as the satellite. The debris collides with...
*Thursday, November 14, 2013 at 9:34am*

**Physics Classical Mechanics**

A hollow cylinder of outer radius R and mass M with moment of inertia about the center of mass Icm=MR2 starts from rest and moves down an incline tilted at an angle θ from the horizontal. The center of mass of the cylinder has dropped a vertical distance h when it reaches...
*Thursday, November 14, 2013 at 9:21am*

**Physics Classical Mechanics`**

A wheel in the shape of a uniform disk of radius R and mass mp is mounted on a frictionless horizontal axis. The wheel has moment of inertia about the center of mass Icm=(1/2)mpR2 . A massless cord is wrapped around the wheel and one end of the cord is attached to an object of...
*Thursday, November 14, 2013 at 9:21am*

**Physics Classical Mechanics**

A pulley of mass mp , radius R , and moment of inertia about its center of mass Ic , is attached to the edge of a table. An inextensible string of negligible mass is wrapped around the pulley and attached on one end to block 1 that hangs over the edge of the table. The other ...
*Thursday, November 14, 2013 at 7:11am*

**Physics Classical Mechanics**

A Yo-Yo of mass m has an axle of radius b and a spool of radius R . Its moment of inertia about the center can be taken to be I=(1/2)mR2 and the thickness of the string can be neglected. The Yo-Yo is released from rest. You will need to assume that the center of mass of the Yo...
*Thursday, November 14, 2013 at 7:05am*

**PHYSICS HELP**

A satellite of mass m is orbiting the earth, mass M , in a circular orbit of radius ra . Unfortunately a piece of space debris left by a passing rocket lies directly in the satellite's path. The piece of debris has the same mass m as the satellite. The debris collides with...
*Thursday, November 14, 2013 at 4:53am*

**Physics**

A 55.0kg cheerleader uses an oil-filled hydraulic lift to hold four 130kg football players at a height of 1.20m. If her piston is 19.0cm in diameter, what is the diameter of the football players' piston?
*Thursday, November 14, 2013 at 2:07am*

**physics**

Two spherical conducting wires A and B are connected to the same potential difference. Wire A is three times as long as wire B, with a radius double that of wire B and resistivity doubles that of wire B. What is the ratio power delivered to wire A to the power delivered to ...
*Thursday, November 14, 2013 at 1:56am*

**PHYSICS**

To monitor the breathing of a hospital patient, a thin belt is girded around the patient's chest. The belt is a 200-turn coil. When the patient inhales, the area encircled by the coil increases by 45.0 cm2. The magnitude of the Earth's magnetic field is 50.0 μT ...
*Thursday, November 14, 2013 at 12:55am*

**physics**

With what velocity should the ball be kicked (magnitude in m/s and direction) for an ideal kick off? 4.8 second hang time and horizontal displacement of 60 yards and how high in meters should the ball be expected to go? Thank you
*Thursday, November 14, 2013 at 12:55am*

**physics**

A 19 turn circular coil of wire has diameter 1.09 m. It is placed with its axis along the direction of the Earth's magnetic field of 51.0 µT, and then in 0.195 s it is flipped 180°. An average emf of what magnitude is generated in the coil?
*Wednesday, November 13, 2013 at 10:46pm*

**physics**

A flat loop of wire consisting of a single turn of cross-sectional area 8.10 cm2 is perpendicular to a magnetic field that increases uniformly in magnitude from 0.500 T to 1.90 T in 0.95 s. What is the resulting induced current if the loop has a resistance of 2.80 ?
*Wednesday, November 13, 2013 at 10:20pm*

**Physics (Please Help)**

Problem 4.4- Suppose n o and n e are given. In (a) you only need to find the magnitude of the group velocity. Problem #2 in HW 10 may be helpful. You can also directly use the definition of group velocity, i.e., v g = triangle k w (k), taking into account the equation of the ...
*Wednesday, November 13, 2013 at 9:40pm*

**Physics**

An ocean liner is traveling at 5m/s. A passenger on deck walks towards the rear of the ship at a rate of 4m/s. After walking 30 meters, he turns right and walks at a rate of 4m/s to the rail, which is 12 meters from his turning point. What is his velocity relative to the water...
*Wednesday, November 13, 2013 at 9:40pm*

**Physics (Please Help)**

At the He-Ne laser wavelength (L= 632.8 nm) the refractive indices of crystal quartz are n o = 1.54264 and n e = 1.55171 calculated from its Sellmeier equation. The laser is incident from the air onto the surface of crystal quartz at an angle of incidence of 45 degrees. For ...
*Wednesday, November 13, 2013 at 9:39pm*

**physics-STEVE OR DR>BOBB 22**

The radius of the orbit of a geosynchronous satellite is 36000 km. then the period of revolution of a satellite with its orbital radius 9000 km would be ?
*Wednesday, November 13, 2013 at 9:11pm*

**physics**

An ocean liner is traveling at 5m/s. A passenger on deck walks towards the rear of the ship at a rate of 4m/s. After walking 30 meters, he turns right and walks at a rate of 4m/s to the rail, which is 12 meters from his turning point. What is his velocity relative to the water...
*Wednesday, November 13, 2013 at 8:40pm*

**physics**

If you push a box for a distance of 1 meter with a force of 4.187 newtons, how many calories have been used? 1 calorie= 4.187 Joules
*Wednesday, November 13, 2013 at 6:14pm*

**physics**

If you push a box a distance of 2,000 meters with a force of 1 newton, how many Calories have you used? 1 Calorie= 4,187 Joules
*Wednesday, November 13, 2013 at 6:11pm*

**Physics**

A block accelerates at 3.2 m/s down a plane inclined at an angle 28.0◦ Find µk between the block and the inclined plane. The acceleration of gravity is 9.8 m/s2.
*Wednesday, November 13, 2013 at 5:48pm*

**physics**

In Figure (1), a 3.50 g bullet is fired horizontally at two blocks at rest on a frictionless table. The bullet passes through block 1 (mass 1.13 kg) and embeds itself in block 2 (mass 1.75 kg). The blocks end up with speeds v1 = 0.600 m/s and v2 = 1.32 m/s (see Figure (2)). ...
*Wednesday, November 13, 2013 at 4:38pm*

**physics**

In the figure, block 1 of mass m1 slides from rest along a frictionless ramp from height h = 2.8 m and then collides with stationary block 2, which has mass m2 = 2m1. After the collision, block 2 slides into a region where the coefficient of kinetic friction μk is 0.3 and...
*Wednesday, November 13, 2013 at 4:38pm*

**physics**

A 68 kg man is ice-skating due north with a velocity of 5.6 m/s when he collides with a 42 kg child. The man and child stay together and have a velocity of 3.0 m/s at an angle of 35° north of due east immediately after the collision. What are (a) the magnitude and (b) the ...
*Wednesday, November 13, 2013 at 4:37pm*

**physics**

A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 7.8 rad/s; 60 radians later, its angular speed is 19 rad/s. Calculate (a) the angular acceleration (rad/s2), (b) the time required to ...
*Wednesday, November 13, 2013 at 4:37pm*

**Physics**

A 1400-kg race car can go from 0 to 90km/h in 6.0s . What average power is required to do this?
*Wednesday, November 13, 2013 at 4:33pm*

**physics**

Two spherical conducting wires A and B are connected to the same potential difference. Wire A is three times as long as wire B, with a radius double that of wire B and resistivity doubles that of wire B. What is the ratio power delivered to wire A to the power delivered to ...
*Wednesday, November 13, 2013 at 3:32pm*

**Physics Urgent please help**

A physical pendulum consists of a body of mass contained in the xy-plane. The moment of inertia of the object about an axis perpendicular to the plane and passing through the object's center of mass is I_cm . The object oscillates in the xy-plane about the point S a ...
*Wednesday, November 13, 2013 at 11:05am*

**Physics Important please**

A yo-yo of mass m rests on the floor (the static friction coefficient with the floor is mu ). The inner (shaded) portion of the yo-yo has a radius R-1 , the two outer disks have radii R-2 . A string is wrapped around the inner part. Someone pulls on the string at an angle Beta...
*Wednesday, November 13, 2013 at 10:59am*

**Physics**

Nuclear fusion reaction will occur in a gas duetorium hydrogen nuclei when a nuclei has an average kinetic energy of atleast 0.72MeV. What is the temperature required for nuclear fusion to occur with duetorium hydrogen? (take boltmann constant k = 1.38 x 10^23 j/k)
*Wednesday, November 13, 2013 at 8:05am*

**Physics**

Nuclear fusion reaction will occur in a gas duetorium hydrogen nuclei when a nuclei has an average kinetic energy of atleast 0.72MeV. What is the temperature required for nuclear fusion to occur with duetorium hydrogen? (take boltmann constant k = 1.38 x 10^23 j/k)
*Wednesday, November 13, 2013 at 7:59am*

**physics**

Two spherical conducting wires A and B are connected to the same potential difference. Wire A is three times as long as wire B, with a radius double that of wire B and resistivity doubles that of wire B. What is the power delivered to wire A to the power delivered to wire B?
*Wednesday, November 13, 2013 at 2:58am*

**physics**

a metal wire has a resistance of 8 Ohms at a temperature of 20 degrees. if the same wire has a resistance of 8.40 Ohms at 70 degrees. What is the resistance of this wire in Ohms when its temperature is -10 degree celsius
*Wednesday, November 13, 2013 at 2:03am*

**physics**

A parachutist jumps out of airplane with an initial speed of 2.0 m/s downwards. There is a force of air resistance equivalent to 305 N. Determine the parachutist’s mass if it takes a total of 3 seconds for him to travel 30 m downwards.
*Tuesday, November 12, 2013 at 10:16pm*

**Physics**

n,bhyguftchg vb
*Tuesday, November 12, 2013 at 8:50pm*

**college physics**

A weightlifter has a basal metabolic rate of 92.4 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450 Calorie bagel if he stays in bed all day? (b) How long does it take him if he's working out? (c) ...
*Tuesday, November 12, 2013 at 8:44pm*

**Physics Important please**

A yo-yo of mass m rests on the floor (the static friction coefficient with the floor is mu ). The inner (shaded) portion of the yo-yo has a radius R-1 , the two outer disks have radii R-2 . A string is wrapped around the inner part. Someone pulls on the string at an angle Beta...
*Tuesday, November 12, 2013 at 7:46pm*

**Physics Important please**

A yo-yo of mass m rests on the floor (the static friction coefficient with the floor is mu ). The inner (shaded) portion of the yo-yo has a radius R-1 , the two outer disks have radii R-2 . A string is wrapped around the inner part. Someone pulls on the string at an angle Beta...
*Tuesday, November 12, 2013 at 6:50pm*

**Physics please HELP**

A meteor is approaching. Assume that the meteor started very far away from the earth and just grazes the earth. You may ignore all other forces except gravitational force between earth and meteor. Assume that mass of the meteor is much smaller than mass of the earth. With ...
*Tuesday, November 12, 2013 at 6:46pm*

**Physics**

In a 1-dimensional problem, a single force acts on a 10 kg object and is given the equation F=ax+b where a=250 N/m, b=25 N, x is position of object. There is a force acting on the object while that object moves from x=0 to x=2 lasting 3 sec. 1) What is the work done by this ...
*Tuesday, November 12, 2013 at 6:05pm*

**physics **

A 62-kg woman is standing on a scale while riding in an elevator? As the elevator continues to move up, it has a constant velocity . what is the reading on the scale.?
*Tuesday, November 12, 2013 at 5:49pm*

**physics**

A 72.5 kg skier is going straight down a 31.1o slope. Each ski has a contact area with the snow of 0.137 m2. Calculate the pressure that the snow exerts on each ski.
*Tuesday, November 12, 2013 at 5:33pm*

Pages: <<Prev | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | **78** | 79 | 80 | 81 | 82 | 83 | 84 | Next>>

Post a New Question | Current Questions