Sunday

November 23, 2014

November 23, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

A roller coaster cart of mass m = 201 kg starts stationary at point A, where h1 = 27.7 m and a while later is at B, where h2 = 7.1 m. The acceleration of gravity is 9.8 m/s 2. What is the potential energy of the cart relative to the ground at A? Answer in units of J. (201*27.7...
*Sunday, November 16, 2014 at 1:44pm*

**physics**

A basketball player shoots the ball from a height of 2.22 m above the floor at a horizontal distance of 1 m from the basket which is 3.05 m above the floor. If she shoots the ball at an angle of 42° above the horizontal, what initial speed must she throw the basketball so ...
*Sunday, November 16, 2014 at 11:50am*

**physics**

You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around the same coil have to ...
*Sunday, November 16, 2014 at 11:12am*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*Sunday, November 16, 2014 at 11:05am*

**Physics**

The pistons of a hydraulic press have radii of 2.00cm and 12.00cm, respectively. A) What force must be applied to the smaller piston to exert a force of 5250N on the larger piston? B) What is the pressure in (N/cm2) on each piston? C) What is the mechanical advantage of the ...
*Sunday, November 16, 2014 at 10:53am*

**Physics**

You have a tanker that is filled with olive oil, which total mass = 200 kg. The tanker is in the shape of a rectangular box w/vertical sides and a horizontal cross-sectional area 0.9 m^2. How deep a swimming pool do you need so that the tanker doesn't hit the bottom?
*Sunday, November 16, 2014 at 12:53am*

**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 he throw it on the moon?
*Saturday, November 15, 2014 at 11:34pm*

**physics**

A straight horizontal wire carries a current of 3.55 μA. A proton is moving above the wire in a direction parallel to it but opposite to the direction of the conventional current in the wire, at a constant velocity of 8.00×106 m/s. Assume that the force of gravity ...
*Saturday, November 15, 2014 at 10:08pm*

**Physics**

an airplaine is flying at constant speed of 500 km/h on a straight line at 33000 feet above sea level. what is the net force acting on the airplane?
*Saturday, November 15, 2014 at 7:27pm*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*Saturday, November 15, 2014 at 5:34pm*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*Saturday, November 15, 2014 at 5:33pm*

**physics**

1) In 2011, the total of all residential customers in Halton Region used 54 540 000 m3 of water. Halton Region has a population of around 500 000 people and Milton (part of Halton Region) has a population of around 85 000 people. Assuming all people in Halton use the same ...
*Saturday, November 15, 2014 at 5:29pm*

**Physics**

A copper wire that has been heated to 520 degrees Celsius for pliability is plunged into 350 mL of water at 18 degrees Celsius. The final temperature of the copper and water bath is 31 degrees Celsius. Find the mass of the copper wire
*Saturday, November 15, 2014 at 2:56pm*

**Physics **

If the speed of the wave is 330 per sec calculate the wavelength
*Saturday, November 15, 2014 at 1:40pm*

**Physics**

How do i calculate (a) Ep of 1100,310m (b)then calculate the Ep when it is 50m above not 310m
*Saturday, November 15, 2014 at 1:38pm*

**Physics**

Your teacher placed a 4.5 kg block at the position marked with a “ +” (horizontally, 0.5 m from the origin) on a large incline outlined on the graph below and let it slide, starting from rest. Find the horizontal distance from the bottom (right-hand) edge of the ...
*Saturday, November 15, 2014 at 1:28pm*

**Physics**

A copper wire that has been heated to 520 degrees Celsius for pliability is plunnged into 350 mL of water at 18 degrees Celsius. The final temperature of the copper and water bath is 31 degrees Celsius. Find the mass of the copper wire
*Saturday, November 15, 2014 at 1:24pm*

**Physics**

A 1.50 X 10^2g piece of brass(specific heat capacity 3.80 X 10^2 J(kgC) is submerged in 400 mL of water at 27.7 Degrees Celsius. What is the original temperature of the brass if the mixture has a temperature of 28.0 degrees Celsius
*Saturday, November 15, 2014 at 1:22pm*

**physics**

In the figure, a 4.3 kg block is accelerated from rest by a compressed spring of spring constant 660 N/m. The block leaves the spring at the spring's relaxed length and then travels over a horizontal floor with a coefficient of kinetic friction μk = 0.260. The ...
*Saturday, November 15, 2014 at 1:03pm*

**physics**

A 50.0 g sample of lead starts at 22 degrees Celsius and is heated until it absorbs 8.7 X 10^2 of energy. Find the final temperature of the lead
*Saturday, November 15, 2014 at 12:05pm*

**physics**

What is the velocity of a car that move 5 metre in 5 seconds
*Saturday, November 15, 2014 at 11:29am*

**Physics**

The speed of a transverse wave on a stretched string can be changed by adjusting the tension of the string. A stationary wave pattern is set up on a stretched string using an oscillator set at a frequency of 650 Hz. How must the wave be changed to maintain the same stationary ...
*Friday, November 14, 2014 at 11:20pm*

**Physics**

A force, F = (6x̂ + 7y hat) N, is applied to an object at a point whose position vector with respect to the pivot point is r = (7x̂ + 7y hat + 7ẑ) m. Calculate the torque created by the force about that pivot point.
*Friday, November 14, 2014 at 11:14pm*

**Physics**

Determine the moment of inertia for three children weighing 64.0 lb, 44.0 lb and 83 lb sitting at different points on the edge of a rotating merry-go-round, which has a radius of 12 ft.
*Friday, November 14, 2014 at 11:14pm*

**physics**

consider the 666 N weight held by two cables shown below. The left hand cable and tension 530 N and makes an angle of theta2 with the ceiling. The right hand cable had tension 390 N and makes an angle of theta1 with the ceiling. What is the angle theta1 which the right hand ...
*Friday, November 14, 2014 at 8:24pm*

**physics **

A 50.0 g sample of lead starts at 22 degrees Celsius and is heated until it absorbs 8.7 X 10^2 of energy. Find the final temperature of the lead
*Friday, November 14, 2014 at 8:11pm*

**physics**

A child pulls a 13 kg sled across the snow at a constant 1.6 m/s [N] applying a force of 51 N [N 25 deg U]. How much work have they done after pulling for 44 m? Round answers to the nearest whole number. m=13kg Vcon=1.6m/s F=51N d=44 cos theta=25 W=Fdcostheta? I don't know...
*Friday, November 14, 2014 at 5:11pm*

**Physics**

The graph shows the temperature versus time relationship for 2kg of particular substance. The substance is in the solid state at a temperature of 20 degrees Celsius b) If 200 joules of heat is added during the time interval B(20 degrees Celsius) to C(80 degrees Celsius), what ...
*Friday, November 14, 2014 at 5:01pm*

**physics**

135.2 J of heat energy are transferred to 24.75 g of mercury. By how much does the temperature increase? (in K) Specific heat of the mercury is 140 J/kg·°C. How much heat is needed to raise the temperature of 24.75 g of water by the same amount? Specific heat of the...
*Friday, November 14, 2014 at 4:45pm*

**Physics**

The graph shows the temperature versus time relationship for 2 kg of particular substance. The substance is in the solid state at a room temperature of 20 degrees Celsius. - The 100 joules of heat is needed to completely change the substance from a solid to a liquid state, ...
*Friday, November 14, 2014 at 3:59pm*

**physics**

using 6400 km as the radius of earth, calculate how high above earth's surface you would have to be in order to weigh 1/16th of your current weight.
*Friday, November 14, 2014 at 3:07pm*

**PHYSICS (please help)**

Three masses are connected by a string. M1 = 1.0kg M2 = 2.0kg M3 = 3.0kg Mass one and two are on a table while mass three hangs off the edge of the table (there is a pulley). Find the tension in the string connecting m1 and m2. Assume the table is frictionless and the masses ...
*Friday, November 14, 2014 at 12:34pm*

**physics**

a boom 4.7 meters,10000 kg, 20 degree angle, find torqe on the pivot i fond force=10000x9.81= 98100 N perpindiclar force = 33552 N torqe = 4.7x33552 = 167695 Nm i am told this is wrong
*Friday, November 14, 2014 at 11:49am*

**physics **

How much heat must be added to 20 grams of water at 100 degrees Celsius to convert it to steam? My work Q = (20)(4.18 x 10^3)(100) = 8360000 J Is that the correct answer?
*Friday, November 14, 2014 at 11:31am*

**physics **

216J if energy is required to raise the temperature of aluminium from 15 degrees Celsius to 35 degrees Celsius. Calculate the mass of the aluminium. My work I keep getting 0.012 but it is not right I know the formula is Q= m x C x T
*Friday, November 14, 2014 at 10:55am*

**PHYSICS**

A 75 kg window cleaner uses a 10 kg ladder that is 7.2 m long. He places one end on the ground 4.5 m from a wall, rests the upper end against a cracked window, and climbs the ladder. He is 5.2 m up along the ladder when the window breaks. Neglect friction between the ladder ...
*Friday, November 14, 2014 at 10:16am*

**Physics**

A 75 kg window cleaner uses a 10 kg ladder that is 7.2 m long. He places one end on the ground 4.5 m from a wall, rests the upper end against a cracked window, and climbs the ladder. He is 5.2 m up along the ladder when the window breaks. Neglect friction between the ladder ...
*Friday, November 14, 2014 at 10:13am*

**physics**

Calculate the potential energy of a 9.00 g bullet traveling 4.00 m above the ground at 50.0 m/s with respect to the ground
*Friday, November 14, 2014 at 9:23am*

**Physics**

A 1180 kg car rounds a circular turn of radius 19.1 m. If the road is flat and the coefficient of static friction between the tires and the road is 0.67, how fast can the car go without skidding? m/s
*Friday, November 14, 2014 at 9:04am*

**Physics**

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 8.2 m long. His speed at the bottom of the swing is 7.2 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that Tarzan can have ...
*Friday, November 14, 2014 at 8:45am*

**physics**

a 6.3 kg watermelon is placed at one end of a 7.6 m, 201 n scaffolding supported by two cables. one supporting cable is at the opposite end of the scaffolding, and the other is 1.1 m from the watermelon
*Friday, November 14, 2014 at 2:15am*

**Physics**

The two masses (m1 = 5.0 kg and m2 = 3.0 kg) in the Atwood's machine shown in the figure are released from rest, with m1 at a height of 0.91 m above the floor. When m1 hits the ground its speed is 1.0 m/s. Assume that the pulley is a uniform disk with a radius of 12 cm. ...
*Friday, November 14, 2014 at 1:56am*

**physics**

A piece of putty of mass m = 0.75 kg and velocity v = 2.5 m/s moves on a horizontal frictionless surface. It collides with and sticks to a rod of mass M = 2 kg and length L = 0.9 m which pivots about a fixed vertical axis at the opposite end of the rod as shown. What fration ...
*Friday, November 14, 2014 at 1:43am*

**Physics**

Mary if riding her bike at a constant velocity of 10.2m/s. Suddenly someone jumps in front of her, 6 meters ahead of her. The coefficient of friction is 0.35, and her total mass is 130kg. She slams the breaks with 800N of force. Will she be able to stop in time? I heard that ...
*Thursday, November 13, 2014 at 11:27pm*

**Physics**

A force of 12.7 N pulls horizontally on a 1.4-kg block that slides on a rough, horizontal surface. This block is connected by a horizontal string to a second block of mass m2 = 2.32 kg on the same surface. The coefficient of kinetic friction is µk = 0.22 for both blocks...
*Thursday, November 13, 2014 at 10:29pm*

**Physics**

A block is placed on a frictionless ramp at a height of 14.5 m above the ground. Starting from rest, the block slides down the ramp. At the bottom of the ramp, the block slides onto a frictionless horizontal track without slowing down.At the end of the horizontal track, the ...
*Thursday, November 13, 2014 at 10:22pm*

**Physics**

The radius of the aorta is about 1.2cm , and the blood passing through it has a speed of about 50cm/s . Coefficient of viscosity for the whole blood (37∘) is n = 4×10^−3 Pa⋅s. Calculate the pressure drop per cm along the aorta.
*Thursday, November 13, 2014 at 9:44pm*

**physics**

The block of mass 1.43443 kg has an acceleration of 3.6 m/s^2 as shown. What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s^2 and the surface is frictionles
*Thursday, November 13, 2014 at 8:31pm*

**Physics-Atwood's Machine**

A 5 kg block rests on a horizontal surface. Determine the horizontal force required to accelerate the block at 3 m/s^2. The frictional coefficient is 0.5. Fnet=mass(accer.) FH=5kg (3m/s^2)= 15N I don't know what to make of the frictional coefficient
*Thursday, November 13, 2014 at 6:17pm*

**Physics **

Your friend's 13.9g graduation tassel hangs on a string from his rearview mirror. When he accelerates from a stoplight, the tassel deflects backward toward the rear of the car at an angle of 5.47∘ relative to the vertical. Find the tension in the string holding the ...
*Thursday, November 13, 2014 at 6:15pm*

**physics**

if a cannon shoots a 9-kg shell at 140 m/s straight up, what is the kinetic energy of the shell at the moment it is fired?
*Thursday, November 13, 2014 at 2:47pm*

**physics**

A 3 point jump shot is released 2.2 m above the ground, 6.14 m from the basket, which is 3.06 m high. For launch angles of 30° and 60°, find the speed needed to make the basket.
*Thursday, November 13, 2014 at 2:28pm*

**physics**

A 10 kg block slides 4.0 m down a ramp (having a coefficient of kinetic friction of 0.4 everywhere along the ramp) as shown above, then collides with a spring whose spring constant is 250 N/m. What is the maximum compression of the spring?
*Thursday, November 13, 2014 at 1:58pm*

**Physics**

A billiard ball traveling at 3.00 m/s collides perfectly elastically with an identical billiard ball initially at rest on the level table. The initially moving billiard ball deflects 30.0° from its original direction. What is the speed of the initially stationary billiard ...
*Thursday, November 13, 2014 at 1:49pm*

**Physics help **

A blacksmith at a historical reenactment is making an iron hinge. after placing the iron (0.750 kg) in the fire and shaping it with his hammer it is still at 200 C. he puts the iron piece in an 8 L bucket of water at 25 C. what is the final temp. of the iron (assume it is in ...
*Thursday, November 13, 2014 at 1:16pm*

**Physics Help Please!**

an isolated container holding 5 kg of sulfuric acid is at 60 C. if 2.49x10^5 Joules of energy were transferred out of the acid, what would be the new temp. of the acid?
*Thursday, November 13, 2014 at 1:02pm*

**physics**

what is the t shirts vertical componet of its velocity at launch? if it launches straight at 45° above the horizontal plane at 141 /s?
*Thursday, November 13, 2014 at 12:29pm*

**physics**

Calculate the momentum of a 0.1 kg rifle bullet traveling 500 m/s. Answer in units of kg•m/s
*Thursday, November 13, 2014 at 10:34am*

**astronomy/physics**

If the Solar System had formed right after the Big Bang, it would have lacked oxygen (O), and therefore water (H2O). Using the solar nebula theory, describe what would have been most different about the planet formation process and the planets formed in this alternative Solar ...
*Thursday, November 13, 2014 at 8:47am*

**physics / astronomy **

A simple temperature model for the solar nebula disk is ￼Tdisk(a) = 20 × SQRT 100 AU/ a K, (1) where a should be expressed in AU in this equation. ￼(a) Find the temperature in the solar nebula disk at the orbit of Mer- cury, Earth and Jupiter. (b) Where is ...
*Thursday, November 13, 2014 at 8:46am*

**Physics**

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 8.2 m long. His speed at the bottom of the swing is 7.2 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that Tarzan can have ...
*Thursday, November 13, 2014 at 8:41am*

**Physics**

An electron is accelerated from rest through a potential difference that has a magnitude of 2.70 × 107 V. The mass of the electron is 9.11 × 10-31 kg, and the negative charge of the electron has a magnitude of 1.60 × 10-19 C. (a) What is the relativistic ...
*Thursday, November 13, 2014 at 1:27am*

**Physics**

At the start of a trip, a driver adjusts the absolute pressure in her tires to be 2.84 ✕ 105 Pa when the outdoor temperature is 281 K. At the end of the trip she measures the pressure to be 2.95 ✕ 105 Pa. Ignoring the expansion of the tires, find the air ...
*Thursday, November 13, 2014 at 12:43am*

**physics**

A simple temperature model for the solar nebula disk is ￼Tdisk(a) = 20 × SQRT 100 AU/ a K, (1) where a should be expressed in AU in this equation. ￼(a) Find the temperature in the solar nebula disk at the orbit of Mer- cury, Earth and Jupiter. (b) Where is ...
*Thursday, November 13, 2014 at 12:37am*

**Physics**

The diameter of the Moon is 3.78x10^6m. It subtends an angle of .00982 radians at the surface of Earth. How far is the Moon from Earth? (Please explain I can't wrap my head around this question.)
*Thursday, November 13, 2014 at 12:14am*

**physics**

A 4.5 kg block is dropped onto a spring of spring constant 1861 N/m from a height of 1500 cm find the speed of the block when the compression of the spring is 12 cm. The acceleration of gravity is 9.81 m/s
*Wednesday, November 12, 2014 at 10:36pm*

**physics**

A truck has two wheels and the area of each wheel is 3 square meters and the total pressure exerted by the truck on the ground is 20 000Pa. Find the mass of the truck.
*Wednesday, November 12, 2014 at 9:57pm*

**Physics (Work Problem)**

A 25kg box is pulled across a frictionless floor by a rope that is inclined 30 degrees above horizontal. The tension in the rope is 50N. How much work is done by the force in moving the crate 10 meters? If the box started at rest, what is the final velocity of the box?
*Wednesday, November 12, 2014 at 9:46pm*

**Physics**

A box is sitting at rest at the top of a ramp 3.00m long at an angle to the horizontal of 12 degrees. When the box reaches the bottom of the frictionless ramp, it falls an additional 2.00 m vertically before hitting the floor. How far from the right end of the ramp does the ...
*Wednesday, November 12, 2014 at 9:23pm*

**Physics help **

an isolated container holding 5 kg of sulfuric acid is at 60 C. if 2.49x10^5 Joules of energy were transferred out of the acid, what would be the new temp. of the acid?
*Wednesday, November 12, 2014 at 9:05pm*

**physics**

A skier going down a hill accelerates from 5.15m/s to17.3m/s over a period of 11.7 seconds. For all calculations, you may neglect drag. If the skier’s total mass is 57.3kg, what is the average force applied by the snow against the skis to bring her to a stop? would it be...
*Wednesday, November 12, 2014 at 9:04pm*

**Physics**

How fast is an object traveling after 3seconds if its terminal velocity is about 35 m/s.?
*Wednesday, November 12, 2014 at 8:53pm*

**Physics**

A pendulum on earth swings with angular frequency ω. On an unknown planet, it swings with angular frequency ω /2. The acceleration due to gravity on this planet is A) 4g B) 2g C) g/2 D) g/4 I think it is C but I am not sure...
*Wednesday, November 12, 2014 at 8:14pm*

**Physics**

What is the horizontal component of the force of an object sloped at a 45° angle. pulling with a force of 110N.
*Wednesday, November 12, 2014 at 8:04pm*

**Physics**

show that the oscillation of a liquid in a u-tube is in simple harmonic motion.
*Wednesday, November 12, 2014 at 6:42pm*

**physics- energy and work**

A 47.6-kg diver steps off a 10.82 m high diving board and drops straight down into the water. If the diver comes to rest 5.3 m below the surface of the water, determine the average resistance force exerted on the diver by the water. What is the total displacement of the diver?...
*Wednesday, November 12, 2014 at 6:20pm*

**physics- energy and work**

To push a 33.0-kg crate up a frictionless incline angled at 27.0° to the horizontal, a worker exerts a force of 388 N parallel to the incline. The crate moves a distance of 4.10 m. What work is done on the crate by the worker? What work is done on the crate by the weight ...
*Wednesday, November 12, 2014 at 6:10pm*

**Physics**

In a horizontal spring-mass configuration, the position of the 0.52 kg mass is described by [x = (1.09 m) sin(2.70t)] a) What is in meters the amplitude of these oscillations? b) What is in m/s the maximum speed of the mass under these conditions? c) What is in Joules the ...
*Wednesday, November 12, 2014 at 5:57pm*

**Physics**

A car starts from rest and travels for 5.9 s with a uniform acceleration of +1.3 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.7 m/s2. The breaks are applied for 1.60 s. (a) How fast is the car going at the end of the braking period? 2.6 m/s (b...
*Wednesday, November 12, 2014 at 5:17pm*

**physics**

An unidentified flying object is cruising 30.0° north of east at a speed of 2132 km/h. How fast is it moving to the north?
*Wednesday, November 12, 2014 at 4:16pm*

**Physics**

A neutron with a mass of 1.67x10^-27 kg traveling east with a kinetic energy of 2.00x10^-21J collides perfectly elastically with helium nucleus with a mass 6.68x10^-27 kg that is initially at rest. After the collision, the neutron has a kinetic energy 1.80x10^-21J. What angle ...
*Wednesday, November 12, 2014 at 11:10am*

**Physics**

Sam pushes crates starting form rest across the floor of his classroom for 3 s with a net force as shown above. For each crate, rank the following from greatest to least: A 100N/30kg, B 75N/20kg C 50N/10kg 1. Impulse delivered 2. Change in momentum 3. Final speed 4. Momentum ...
*Wednesday, November 12, 2014 at 10:43am*

**physics**

It has been said that sometimes lead bullets melt upon impact. Assume that a bullet with an initial temperature of 295 K receives 73.5 % of the work done on it by a wall on impact as an increase in internal energy. (The melting point of lead is 601 K, the heat of fusion for ...
*Wednesday, November 12, 2014 at 9:45am*

**physics**

The R-factor for housing insulation gives the thermal resistance in units of ft2 °F h/BTU. A good wall for harsh climates, corresponding to about 10 in of fiberglass, has R = 45 ft2 °F h/BTU. a) Determine the thermal resistance (in m2 K/W) in SI units. b) Find the heat...
*Wednesday, November 12, 2014 at 9:44am*

**Physics**

an astronaut of mass 150 kg is stranded 100 m from the international space station and is at rest relative to it he decides to throw his movie camera of mass 4.5 kg away at a speed of 10 m/s he has 5 minutes of air left in his tank does he make it back in time?
*Wednesday, November 12, 2014 at 8:27am*

**Physics**

an object of mass 5 kg has initial speed of 8 m/s it is sliding across an 8 m long table and has a coefficient of friction of .204 with the table sitting at the edge of the table is a 3 kg object at rest the 5 kg object collides and sticks to the 3 kg object if table is 1.2 m ...
*Wednesday, November 12, 2014 at 8:18am*

**physics **

A copper (Young's modulus 1.1 x 1011 N/m2) cylinder and a brass (Young's modulus 9.0 x 1010 N/m2) cylinder are stacked end to end, as in the drawing. Each cylinder has a radius of 0.38 cm. A compressive force of F = 6100 N is applied to the right end of the brass ...
*Wednesday, November 12, 2014 at 2:48am*

**physics **

The drawing shows a 156-kg crate hanging from the end of a steel bar (S = 8.1 x 1010 N/m2). The length of the bar is 0.117 m, and its cross-sectional area is 7.44 x 10-4 m2. Neglect the weight of the bar itself and determine (a) the shear stress on the bar and (b) the vertical...
*Wednesday, November 12, 2014 at 12:48am*

**Physics**

Two objects are moving in the xy-plane. No external forces are acting on the objects. Object A has a mass of 3.2 kg and has a velocity of Va= (2.3 m/s)i + (4.2m/s)j and object B has a mass of 2.9 kg and has a velocity of Vb= (-1.8m/s)i + (2.7m/s)j. Some time later, object A is...
*Wednesday, November 12, 2014 at 12:12am*

**Physics**

A 4 kg mass and a 9 kg mass are being held at rest against a compressed spring on a frictionless surface. When the masses are released, the 4 kg mass moves to the east with a speed of 2m/s. What is the velocity of the 9 kg after the are released?
*Wednesday, November 12, 2014 at 12:11am*

**Physics**

A neutron with a mass of 1.67x10^-27 kg traveling east with a kinetic energy of 2.00x10^-21J collides perfectly elastically with helium nucleus with a mass 6.68x10^-27 kg that is initially at rest. After the collision, the neutron has a kinetic energy 1.80x10^-21J. What angle ...
*Wednesday, November 12, 2014 at 12:09am*

**Physics**

A plate falls vertically to the floor and breaks up into three pieces, which slide along the floor. Immediately after the impact, a 200g piece moves along the x-axis with a speed of 2.00m/s and a 235g piece moves along the the y axis with a speed of 1.50m/s. The third piece ...
*Wednesday, November 12, 2014 at 12:08am*

**physics**

A space station shaped like a giant wheel has a radius of 1.00 x 10^2 m and a moment of inertia of 5.00 x 10^8 kgm^2. A crew of 150 lives on the rim, and the station is rotating so that the crew experiences an apparent acceleration of 1.0g. When 120 people move to the center ...
*Tuesday, November 11, 2014 at 11:11pm*

**physics**

Rubber tires and wet blacktop have a coefficient of kinetic friction of 0.5. A pickup truck with a mass 750 kg traveling 30.0 m/s skids to a stop. (a) what is the size and direction of the frictional force that the road exerts on the truck? (b) Find the acceleration of the ...
*Tuesday, November 11, 2014 at 10:40pm*

**Physics**

A mass of 9.8 kg is moving in the positive x direction at 16.6 m/s and collides in a perfectly elastic, head on collision with a mass of 12.7 kg at rest. The same mass of 9.8 kg in the positive direction at 16.6 m/s also collides with the mass of 12.7 kg at rest in an ...
*Tuesday, November 11, 2014 at 9:14pm*

**Physics**

Two forces are applied simultaneously to a crate sliding in a horizontal plane: 36.8 N to the right and 20.2 N to the left. What is the net force on the crate? Let a force to the right be positive and to the left negative. Give your answer in Newtons.
*Tuesday, November 11, 2014 at 9:09pm*

**Physics**

NASA, when it sends probes to other planets, uses what is known as a gravitational slingshot. This is when a probe uses the gravitational potential energy a planet to gain kinetic energy. Even though the probe and the planet are not physically colliding, one can treat this ...
*Tuesday, November 11, 2014 at 9:05pm*

**Physics**

A mass of 9.8 kg is moving in the positive x direction at 16.6 m/s and collides in a perfectly elastic, head on collision with a mass of 12.7 kg at rest. The same mass of 9.8 kg in the positive direction at 16.6 m/s also collides with the mass of 12.7 kg at rest in an ...
*Tuesday, November 11, 2014 at 9:00pm*

**Physics(friction)**

Find the coefficient of friction between a 73kg cubic box measuring 3m and a hardwood floor 16m long and 20m wide if a total of 236N is required to start the box moving.
*Tuesday, November 11, 2014 at 8:51pm*

**physics**

a 2100 kg car starts from rest and accelerates at a rate of 2.6 m/s for 4 sec. assume that the force acting to accelerate the car is acting in the same direction as its motion. how much work has the car done? m=2100 kg w=fd v1=0 f=ma t=4 sec d=t+1/2at(squared) a=2.6 m/s2
*Tuesday, November 11, 2014 at 8:43pm*

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