Tuesday

May 5, 2015

May 5, 2015

**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*

**Physics**

Mark uses 27 J of work to carry the laundry basket with a force of 17 N. What is the distance he carried the laundry basket?
*Tuesday, November 11, 2014 at 7:38pm*

**physics**

A wooden raft has 85% of its volume submerged when it is floating down a river with a density of water being 9.90x10^2 kg/m^3. What is the density of the wooden raft?
*Tuesday, November 11, 2014 at 7:36pm*

**Physics-coefficient of friction**

What's the minimum coefficient of friction between the ladder (of length d) and the ground will keep it from slipping? (consider the wall frictionless) (θ=56.5 degrees) I think the formula is supposed to be mg L/2 sin y, but it does not provide a length, nor a mass. ...
*Tuesday, November 11, 2014 at 7:35pm*

**Physics- tension **

An 63 kg construction worker is sitting 2.0 m from the end of a 1435 kg steel beam to think about the state of the world. Find the tension in the cable that is supporting the beam. Am I required to use the formula T1=sin(theta)*m*g? I am not sure if the problem is similar to a...
*Tuesday, November 11, 2014 at 7:20pm*

**physics**

A glacier advances at 4.3 × 10−6 cm/s.How far will it move in 6.4 years? Assume there is 365 days each year. Answer in units of cm. Thanks in advance!!
*Tuesday, November 11, 2014 at 7:17pm*

**Physics- spring constant **

Astronauts are in space so there is no gravity, but they wish to weight themselves. The spring constant is 265 N/m. The question shows a graph; the y is the position in meters while the x is the seconds. I do not wish for an answer, but the way in which i'm supposed to ...
*Tuesday, November 11, 2014 at 7:15pm*

**physics**

The position of a 0.31 kg object attached to a spring is described by [x = (0.85 m) sin(2.37πt + 0.35)] a) What is the amplitude of oscillations in m? b) What is in meters/second the maximum speed of the oscillating object? Answer in meters/seconds . c) Find in meters/...
*Tuesday, November 11, 2014 at 6:50pm*

**Physics**

Mass 1 with a unknown mass starts at rest at the top of a frictionless from a height of 13 meters. It then slides down the incline and moves over a horizontal frictionless surface and collides inelastically (head on) with mass 2 which is 25.4 kg and initially at rest. After ...
*Tuesday, November 11, 2014 at 6:29pm*

**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 6:00pm*

**Physics**

A clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pulls with a force of 189.0 N at an angle of 30.0◦ with the horizontal. The box has a mass of 39.0 kg, and the coefficient of kinetic friction between the box and floor is 0....
*Tuesday, November 11, 2014 at 5:56pm*

**physics**

Mrs. Meissner is taking her dog Cooper for a walk. Cooper stops to sniff a tree stump and Mrs. Meissner has to exert a force of 148 N on Cooper's leash (held 35 angle above the horizontal) in order to get him to move 2.0 m away from the tree stump. Calculate the work donw ...
*Tuesday, November 11, 2014 at 4:51pm*

**physics**

An object on earth has a weight of 54.3N, what is the weight of the object on the moon, assuming acceleration due to gravity on the moon is 1.61m/s^2?
*Tuesday, November 11, 2014 at 4:39pm*

**Physics**

A dog sled weighing 750 lb is pulled over level snow at a uniform speed by a dog team exerting a force of 60 lb. find the coefficient of friction.
*Tuesday, November 11, 2014 at 4:36pm*

**physics**

The position of a 0.43 kg object attached to a spring is described by [x = (0.49 m) cos(1.25πt)] a) What is the amplitude of oscillations in m? b) What is in meters/second the maximum speed of the oscillating object? Answer in meters/seconds . c) Find in meters/second the...
*Tuesday, November 11, 2014 at 4:14pm*

**physics**

Rearrange the kinetic energy equation to solve for: m And v
*Tuesday, November 11, 2014 at 4:12pm*

**physics**

what is neutral atom?
*Tuesday, November 11, 2014 at 2:35pm*

**Physics**

A 70kg sky diver falls 5000m. a) by how much does her gpe decrease during her fall? Ep=mxgxh = 70x10x5000 = 3,500,000J b) By how much does her kinetic energy increase during the fall? KE GAINED = GPE LOST = 3,500,oooJ c) What would her speed be just before she hit the ground? ...
*Tuesday, November 11, 2014 at 2:27pm*

**physics **

A spring stretches 5.00 cm when a 10.00 g object is hung from it. The object is replaced with another object of mass 20.00 g that oscillates in simple harmonic motion. a) Calculate the spring constant in N/m. Use 9.8 m/s2 for g. b) Calculate the period of motion in seconds.
*Tuesday, November 11, 2014 at 2:21pm*

**physics**

If each of the three rotor helicopter blades is L = 3.69m long and has a mass of m = 159kg, calculate the moment of inertia of the three rotor blades about the axis of rotation.
*Tuesday, November 11, 2014 at 1:49pm*

**Physics**

A ball starts 1.175 meters off the ground and shot at an angle of 40 degrees with a velocity of 3.2 m/s. Where does it land?
*Tuesday, November 11, 2014 at 1:41pm*

**physics**

The distance between a hydrogen atom (m = 1.0u) and a chloride atom (m = 35.5u) in the HCl molecule is 1.27×10-10m. How far from the hydrogen atom is the center of mass of the molecule?
*Tuesday, November 11, 2014 at 1:22pm*

**physics**

a boy pulls a bucket of water of mass sky from a well of depth 10 cm calculate the work done ?
*Tuesday, November 11, 2014 at 11:01am*

**Physics**

A small ball with a mass of 30.0 g is loaded into a spring gun, compressing the spring by 13.0 cm. When the trigger is pressed, the ball emerges horizontally from the barrel at a height of 2.30 m above the floor. It then strikes the floor, after traveling a horizontal distance...
*Tuesday, November 11, 2014 at 10:43am*

**Physics**

An 8.46 kg block drops straight down from a height of 0.90 m, striking a platform spring having a force constant of 9.90 102 N/m. Find the maximum compression of the spring
*Tuesday, November 11, 2014 at 10:41am*

**physics**

A Second's pendulum is suspended from the roof of a lift.What will be the time period of the Pendulum if the lift is moving up with an acceleration of 2m/sec^2
*Tuesday, November 11, 2014 at 10:18am*

**physics **

a second's pendulum is suspended from the roof of the lift.what will be the time period of the pendulum if the lift is moving up with an acceleration 20m/s^2
*Tuesday, November 11, 2014 at 10:08am*

**physics**

a ruby laser emits light at wavelength 694.4nm. if a laser pulse is emitted for 12pico seconds and the energy released per pulse is 100mJ, what is the length of the pulse?
*Tuesday, November 11, 2014 at 8:28am*

**physics**

A cylinder of gas is compressed by a piston from an initial volume of 125litres to a final volume of 90 litres.The compression occurs at constant pressure,and the work done on the gas by the piston is 10^4J.What is the gas pressure during the compression?
*Tuesday, November 11, 2014 at 6:24am*

**physics**

A gas molecule at the surface of the earth happens to have the root mean square speed (rms)for that gas at 0°C.lf it were to go straight up without colliding with other molecules.How high would it rise and what would happen to the maximum height reached if a gas with ...
*Tuesday, November 11, 2014 at 5:59am*

**physics**

One mole of an ideal gas occupies a volume of 3.5×10^-2m^3 and exerts a pressure of 3atm on the walls of its container.Find average translatoinal kinetic energy per molecule and the absolute temperature of the gas? K avg=(3/2)kT
*Tuesday, November 11, 2014 at 4:42am*

**physics**

the ray of son strike the surfaces of a lake at an angle of incidence of 30°.find the angle through which the rays are deviated when they enter water of refrective index 1.33.
*Tuesday, November 11, 2014 at 1:09am*

**Physics**

Matthew is spelunking when he loses his rope. John lowers a rope down to him, a distance of 40m. If Matthew has a mass of 50kg, and the rope can withstand a maximum force of 547N without breaking, what is the minimum amount of time it will take to pull Matthew out of the cave??
*Tuesday, November 11, 2014 at 12:42am*

**physics**

Mia is on a planet where g=10 m/s^2. she is standing on a bathroom scale in an elevator. the scale reads 500N. the elevator accelerates upward with an acceleration of 5.0m/s^2 what would the scale read now
*Tuesday, November 11, 2014 at 12:26am*

**Physics**

A primitive diving bell consists of a cylindrical tank with one end open and one end closed. The tank is lowered into a freshwater lake, open end downward. Water rises into the tank, compressing the trapped air, whose temperature remains constant during the descent. The tank ...
*Tuesday, November 11, 2014 at 12:08am*

**physics**

A car constantly accelerates at a rate of 4.8 m/s2 along a flat, straight road. If the car has traveled 122.1 meters, how fast is the car going?
*Monday, November 10, 2014 at 8:50pm*

**physics**

Bob fires a cannon horizontally off a 125 meter cliff.the cannonball leaves the cannon traveling at 144 meters per second. How far from the cliff will the cannonball land?
*Monday, November 10, 2014 at 8:44pm*

**Physics **

A playground merry-go-round of radius R = 2.15 m has a moment of inertia of I = 256 kg * m2 and is rotating at 10.9 revolutions/min about a frictionless vertical axle. Facing the axle, a 29.6 kg child hops onto the merry-go-round and manages to sit down on its edge. What is ...
*Monday, November 10, 2014 at 7:36pm*

**physics**

A hungry bear weighing 720 N walks out on a beam in an attempt to retrieve a basket of goodies hanging at the end of the beam (see the figure below). The beam is uniform, weighs 200 N, and is 7.00 m long, and it is supported by a wire at an angle of θ = 60.0°. The ...
*Monday, November 10, 2014 at 3:54pm*

**Physics**

An green hoop with mass mh = 2.4 kg and radius Rh = 0.14 m hangs from a string that goes over a blue solid disk pulley with mass md = 2.2 kg and radius Rd = 0.1 m. The other end of the string is attached to a massless axel through the center of an orange sphere on a flat ...
*Monday, November 10, 2014 at 3:10pm*

**physics**

A Hot Wheels car of mass 0.081 kg starts at a height of 1.42 m and goes through a loop with a height of 0.38 m with a radius of 0.16 m along a track of length 3.02 m. The car barely makes it through the loop. Since, Work = Force x distance, what is the force of friction acting...
*Monday, November 10, 2014 at 2:53pm*

**Physics **

A 5.00-kg block is placed on top of a 12.0-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.650. What is the maximum horizontal force that can be applied before the 5.00-kg block begins to slip relative to the 12.0-kg ...
*Monday, November 10, 2014 at 2:30pm*

**physics**

An object is formed by attaching a uniform, thin rod with a mass of mr = 6.54 kg and length L = 5.12 m to a uniform sphere with mass ms = 32.7 kg and radius R = 1.28 m. Note ms = 5mr and L = 4R. 1)What is the moment of inertia of the object about an axis at the left end of the...
*Monday, November 10, 2014 at 2:12pm*

**Physics**

A uniform disk with mass m = 8.54 kg and radius R = 1.35 m lies in the x-y plane and centered at the origin. Three forces act in the +y-direction on the disk: 1) a force 333 N at the edge of the disk on the +x-axis, 2) a force 333 N at the edge of the disk on the –y-axis...
*Monday, November 10, 2014 at 1:47pm*

**Physics**

A space vehicle is orbiting Earth in a circular orbit with a radius of 10,300,000m. What is the minimum increase in speed that is needed for the vehicle to escape Earth's gravitational field? The mass of the Earth is 5.97x10^24 kg and G = 6.67x10^-11 N*m^2/kg^2. The answer...
*Monday, November 10, 2014 at 10:38am*

**Physics**

A mass of 100g is attached to one end of a massless rod, 10cm in length, which is pivoted about the opposite end. The rod is held vertical, with the mass at the top, and released. The rod swings. A. What is the speed of the mass at the instant that the rod is horizontal? B. ...
*Monday, November 10, 2014 at 10:34am*

**physics**

A car is traveling at 58.2 km/h on a ﬂat highway. The acceleration of gravity is 9.8 m/s2 . If the coeﬃcient of friction between the road and the tires on a rainy day is 0.155, what is the minimum distance in which the car will stop?
*Monday, November 10, 2014 at 8:32am*

**PHYSICS**

Calculate the work done against external atmospheric pressure when 1 g of water changes to 1672cm3 of steam. Take the atmospheric pressure as 1.013×105Nm−2
*Monday, November 10, 2014 at 4:53am*

**physics**

A target lies flat on the ground 4 m from the side of a building that is 10 m tall, as shown below. The acceleration of gravity is 10 m/s2 . Air resistance is negligible. A student rolls a 4 kg ball off the horizontal roof of the building in the direction of the target.
*Sunday, November 9, 2014 at 11:41pm*

**Physics**

A moving 4.5 kg block collides with a horizontal spring whose spring constant is 226 N/m (see figure). The block compresses the spring a maximum distance of 8.0 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.47...
*Sunday, November 9, 2014 at 11:08pm*

**physics**

A ball is kicked at a 45* angle over a 6 ft fence 20 m away at 17 m/s. How far above the fence will the ball pass? No air resistance
*Sunday, November 9, 2014 at 10:50pm*

**physics**

During a baseball game, a batter hits a pop-up to a fielder 92m away. The acceleration is 9.8 m/s^2. If the ball remains in the air for 5.8 seconds, how high does it rise?
*Sunday, November 9, 2014 at 10:39pm*