Thursday

December 18, 2014

December 18, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**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*

**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 ...
*Sunday, November 9, 2014 at 9:21pm*

**Physics**

A wire is made by attaching two segments together, end to end. One segment is made of aluminum and the other is steel. The effective coefficient of linear expansion of the two-segment wire is 19.0 x 10-6 (C°)-1. What fraction of the length is aluminum?
*Sunday, November 9, 2014 at 9:18pm*

**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 ...
*Sunday, November 9, 2014 at 9:12pm*

**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?
*Sunday, November 9, 2014 at 9:03pm*

**Check my physics answer**

When should you express a vector along the x-axis as a negative vector? when its magnitude is less than 1 when the arrow representing the vector would point toward negative x when the arrow representing the vector would point toward positive x when its magnitude is greater ...
*Sunday, November 9, 2014 at 8:37pm*

**physics**

A cricket pitch roller of diameter 1.5 m has a mass of 450 kg; it is pulled by a handle attached to its centre. Find the minimum force to pull up a step which is 250 mm high if the roller handle makes an angle of 30o with the horizontal.
*Sunday, November 9, 2014 at 8:09pm*

**physics**

A 7.75 kg(75.95 N)box is placed on a 29.7° incline on top of a lab table. The ramp is 3.11 m long, at the bottom of the incline the box slides horizontally for a short distance before rolling off the lab table. If the table is 0.84 m high, find how far from the table the ...
*Sunday, November 9, 2014 at 8:05pm*

**Can you check my answer - Physics**

A balloonist drops an apple weighing 1.5 N over the side of the balloon's gondola. As it falls and increases speed, the drag force from the air upward on it increases. When the upward force is 0.7 N, what is the direction and magnitude of the net force on the apple? 9.8 N ...
*Sunday, November 9, 2014 at 7:53pm*

**physics**

A plane cruising along at 268 m/s, in straight level flight wants to drops a bomb. He is at a height of 1000m. At what distance should the pilot release the bomb in order to hit his target?
*Sunday, November 9, 2014 at 7:18pm*

**Physics**

A steel ruler is calibrated to read true at 21.6 °C. A draftsman uses the ruler at 44.5 °C to draw a line on a 44.5 °C copper plate. As indicated on the warm ruler, the length of the line is 0.314 m. To what temperature should the plate be cooled, such that the ...
*Sunday, November 9, 2014 at 7:07pm*

**Physics**

A 0.422-kg ball with a speed of 1.31 m/s rolls across a level surface toward an open 0.348-kg box that is resting on its side. The ball enters the box, and the box (with the ball inside it) then slides across the surface a distance of 0.473 m. What is the coefficient of ...
*Sunday, November 9, 2014 at 6:48pm*

**Physics**

A 18 g bullet is fired into the bob of a ballistic pendulum of mass 1.4 kg. When the bob is at its maximum height, the strings make an angle of 60° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet.
*Sunday, November 9, 2014 at 6:36pm*

**Physics**

A 0.9-kg block (mass m) and a second block (mass M) are both initially at rest on a frictionless inclined plane. Mass M rests against a spring that has a force constant of 12.2 kN/m. The distance d along the plane between the two blocks is 3.64 m. The 0.9-kg block is released...
*Sunday, November 9, 2014 at 6:31pm*

**Physics**

Traveling at a speed of 22m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of friction between the tires and the road is 0.68. How much time does it take for the car to come to a halt? As usual, ignore the effects of air ...
*Sunday, November 9, 2014 at 6:12pm*

**Physics**

Two masses ( 2.3 kg and 4.2 kg) connected by a massless rope hung over opposite ends of a frictionless pulley. Each mass is initially 1.50 m above the ground, and the top of the pulley is 6.5 m above the ground. What maximum height does the lighter object reach after the ...
*Sunday, November 9, 2014 at 6:07pm*

**physics**

A 65 kg water skier is pulled up a 15° inclined by a role parallel to the incline with a tension of 500N. The coefficient of kinetic friction is .25. What are the magnitude and direction of the skier's acceleration? I found the weight its 637.65 I found it by ...
*Sunday, November 9, 2014 at 6:04pm*

**Physics**

A person weighs 150 pounds. He is standing on a scale in an elevator and stands on a scale. The elevator is accelerating upwards at a rate of 10 m/s/s, what is the reading of the scale? 150 pounds about 75 pounds about 300 pounds not enough info
*Sunday, November 9, 2014 at 5:59pm*

**Physics**

The best time to dig clams is when the low ocean tide is lowest (when you have the lowest possible tides). This occurs when the moon is full half full moon quater moon actually all low tides are about the same
*Sunday, November 9, 2014 at 5:25pm*

**Physics**

A person weighs 150 pounds. He is standing on a scale inside an elevator. If the elevator is free-falling downward (perhaps the cable broke), what is the reading of the scale? 150 pounds about 25 pounds 0 pounds not enough info
*Sunday, November 9, 2014 at 5:24pm*

**physics **

A mechanic jacks up a car to an angle of 10◦ with the horizontal in order to change the front tires. The car is 2.78 m long and has a mass of 1110 kg. Its center of mass is located 1.15 m from the front end. The rear wheels are 0.25 m from the back end. around the back ...
*Sunday, November 9, 2014 at 4:55pm*

**physics **

As part of a kinetic sculpture, a 5.6 kg hoop with a radius of 3.8 m rolls without slipping. If the hoop is given an angular speed of 2.1 rad/s while rolling on the horizontal and then rolls up a ramp inclined at 17.7◦ with the horizontal, how far does the hoop roll ...
*Sunday, November 9, 2014 at 4:54pm*

**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...
*Sunday, November 9, 2014 at 4:33pm*

**Physics**

Two objects are moving in the xy-plane. 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. What is the total momentum of the system? (should I use dot product here?)
*Sunday, November 9, 2014 at 4:28pm*

**Physics**

An interacting system of two objects has no external force acting on the system. The first has a mass of 2.00kg and is moving with a velocity (2.00m/s)i + (1.00m/s)j at time t=0s. The second object has a mass of 3.00kg and is moving with a velocity (-1.00m/s)i + (1.00m/s)j at ...
*Sunday, November 9, 2014 at 4:22pm*

**physics **

A mechanic jacks up a car to an angle of 10◦ with the horizontal in order to change the front tires. The car is 2.78 m long and has a mass of 1110 kg. Its center of mass is located 1.15 m from the front end. The rear wheels are 0.25 m from the back end. around the back ...
*Sunday, November 9, 2014 at 4:17pm*

**Physics**

A simple pendulum of length 2.00m is made with a mass of 2.00kg. The mass has speed of 3.00 m/s when the pendulum is 30 degrees above its lowest position. -What is the maximum angle away from the lowest position the pendulum will reach? -What is the speed of the mass when the ...
*Sunday, November 9, 2014 at 4:15pm*

**Physics**

A mass of 2.0kg traveling at 3.0 m/s along a horizontal plane hits a relaxed spring 20cm away from it. The coefficient of kinetic friction is 0.3. The mass is slowed to zero velocity when the spring has been compressed. By how much the spring has been compressed, the spring ...
*Sunday, November 9, 2014 at 4:14pm*

**Physics**

A car of mass 900 kg pulls a caravan of mass 400 kg along a straight horizontal road with an acceleration of 2 ms-2. Assuming that the frictional forces are negligible, the tension in the coupling between the car and caravan is
*Sunday, November 9, 2014 at 3:46pm*

**physics**

An empty 160 kg elevator accelerates upward at 1.2 m/s 2 . The acceleration of gravity is 9.8 m/s 2 . What is the tension in the cable that lifts the elevator cab? Answer in units of N
*Sunday, November 9, 2014 at 2:49pm*

**Physics**

A dynamics cart with a mass of 1.70kg on a horizontal table is attached to a suspended mass of 0.40kg and released from rest. If a frictional of 2.0N opposes the motion of the cart how far does the cart travel in 1.5s
*Sunday, November 9, 2014 at 12:51pm*

**physics 1**

A 8.00-kg block of ice, released from rest at the top of a 1.44-m-long frictionless ramp, slides downhill, reaching a speed of 2.54m/s at the bottom.
*Sunday, November 9, 2014 at 12:43pm*

**physics**

A 40kg box of sweet cherries at 10 ° c cosisting of 30kg water and 10kg cherries is to be frozen at -30°c.Calculate the total amount of heat that needsto be removed from the cherries . The specific heat capacity of cherries is 3.43kj /kg°c. The specific ccapacity ...
*Sunday, November 9, 2014 at 12:15pm*

**physics**

A 40kg box of sweet cherries at 10 ° c cosisting of 30kg water and 10kg cherries is to be frozen at -30°c.Calculate the total amount of heat that needsto be removed from the cherries . The specific heat capacity of cherries is 3.43kj /kg°c. The specific ccapacity ...
*Sunday, November 9, 2014 at 12:03pm*

**physics**

The latent heat of fusion for metal is 246kj per kg. How much heat would be used by melting 10 tonnes of metal?
*Sunday, November 9, 2014 at 12:00pm*

**physics**

A coolant fluid has a latent heat of evaporation of 234 kj/kg . If the pump rate is 2250g per minute. How much thermal heat is removed each hour?
*Sunday, November 9, 2014 at 11:59am*

**physics**

A child is standing on a platform of a station. A train travelling at 30m/s takes 3.0 secs to pass the child.What is the length of the train. a)10m-this was my answer b)27m c)30m d)90m
*Sunday, November 9, 2014 at 11:38am*

**Physics**

A box weighing 178N slides down a ramp with an initial velocity of 0.5m/s^2. The ramp has an angle of 24 degrees and is 3m long. What is the acceleration of the box? I know that F=ma but how do I find a?
*Sunday, November 9, 2014 at 10:44am*

**physics**

An air-cooled motorcycle engine loses a significant amount of heat through thermal radiation according to the Stefan-Boltzmann equation. Assume that the ambient temperature is T0 = 24.5°C (297.65 K). Suppose the engine generates 11.5 hp (8.58 kW) of power and, due to ...
*Sunday, November 9, 2014 at 9:21am*

**Physics**

calculate the component of a force of 200n at a direction of 60 to the force.
*Sunday, November 9, 2014 at 8:02am*

**physics**

A jet plane is flying with a constant speed along a straight line, at an angle of 25.5° above the horizontal, as Figure 4.30a indicates. The plane has weight vector W whose magnitude is 86500 N, and its engines provide a forward thrust vector T of 103000 N. In addition, ...
*Saturday, November 8, 2014 at 11:50pm*

**Physics**

A 24.00 kg block at rest on a horizontal frictionless air track is connected to the wall via a spring. The equilibrium position of the mass is defined to be at x=0. Somebody pushes the mass to the position x=0.3500 m, then lets it go. The mass undergoes simple harmonic motion ...
*Saturday, November 8, 2014 at 11:42pm*

**Physics with Calculus**

The system shown in the figure is in static equilibrium. The rod of length L and mass M is held in an unpright position. The top of the rod is tied to a fixed vertical surface by a string, and a force F is applied at the midpoint of the rod. The coefficient of static friction ...
*Saturday, November 8, 2014 at 10:45pm*

**physics**

A 2.7 kg object falls from a tower. It experiences 2.3 N of air resistance. What is the acceleration?
*Saturday, November 8, 2014 at 10:30pm*

**Physics test review**

A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the initial velocity of ...
*Saturday, November 8, 2014 at 9:37pm*

**Physics**

A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s
*Saturday, November 8, 2014 at 9:32pm*

**Physics**

A 4.80kg cat leaps from the floor to the top of a 94.0-cm-high table. If the cat pushes against the floor for 0.230s to accomplish this feat, what was her average power output in hp during the pushoff period?
*Saturday, November 8, 2014 at 8:53pm*

**Physics**

A small sphere of mass 2 kg is attached to the end of a cord of length 2m and rotated in a vertical circle about a fixed point O. Determine the tension in the cord at the lowest point of the trajectory if the speed at this point is 7m/s. Use g=9.8 m/s2.
*Saturday, November 8, 2014 at 8:01pm*

**Physics**

A small sphere of mass 1 kg is attached to the end of a cord of length 1 m and rotated in a vertical circle about a fixed point O. If the speed at the uppermost point of the trajectory is 1 m/s, the sphere will have a circular trajectory (will move in a circle). Use g=9.8 m/s2.
*Saturday, November 8, 2014 at 8:00pm*

**Physics**

A small sphere of mass 3 kg is attached to the end of a cord of length 2m and rotated in a vertical circle about a fixed point O. Determine the tension in the cord at the uppermost point of the trajectory if the speed at this point is 8m/s. Use g=9.8 m/s2.
*Saturday, November 8, 2014 at 8:00pm*

**Physics**

A 1550 -kg car moves on a horizontal curved road. If the radius of the curve is 46 m and the coefficient of friction between the tires and road is 0.1, find the maximum speed the car can have so that it may not skid.
*Saturday, November 8, 2014 at 7:59pm*

**Physics**

A coin is placed on a large disk which rotates uniformly at a rate of 2 rot/s. The coefficient of friction between the coin and the disk is 0.1. To what distance from the center of the disk should the coin be placed so that the coin may not slip? I know that mu times g (.1 x 9...
*Saturday, November 8, 2014 at 7:57pm*

**Physics**

The spring shown in the figure is compressed 59cm and used to launch a 100 kg physics student. The track is frictionless until it starts up the incline. The student's coefficient of kinetic friction on the 30∘ incline is 0.14 . k= 80,000 N/m m=100 kg uk= .14 DeltaX= ...
*Saturday, November 8, 2014 at 7:40pm*

**Physics, please!**

Bill kicks a rock off the top of his apartment building. It strikes a window across the street 17 m away. The acceleration of gravity is 9.8 m/s2 . If the window is 22 m below the position where Bill contacted the rock, how long was it in the air? Answer in units of s How fast...
*Saturday, November 8, 2014 at 6:27pm*

**Physics**

A box of mass m and initial speed v0 slides distance d across a horizontal floor before coming to rest. Use work and energy to find an expression for the coefficient of kinetic friction.Express your answer in terms of the variables v0, d, and free fall acceleration g.
*Saturday, November 8, 2014 at 6:14pm*

**physics**

I'm working on my science fair project for 5th grade. I want to measure the speed of rotation from an Ice skater. What type of equipment would I need to use? I think a video camera, a bright dot on the skater's chest and some type counter software. That's where I&#...
*Saturday, November 8, 2014 at 6:01pm*

**Physics**

A billiard ball moving at 5.45 m/s strikes a stationary ball of the same mass. After the collision, the first ball moves at 4.81 m/s, at an angle of 28Â° with respect to the original line of motion. Find the velocity (MAGNITUDE and DIRECTION) of the second ball after...
*Saturday, November 8, 2014 at 11:59am*

**physics**

. A 2.0 kg brick has the dimensions 7.5 cm x 15 cm x 30 cm. Find the pressure exerted by the brick on a table when it is resting on its various faces.
*Saturday, November 8, 2014 at 5:48am*

**Physics**

An object is placed at a distance of 1.5 m from a screen and a convex lens is interposed between them. The magnification produced is 4. What is the focal length of the lens.
*Saturday, November 8, 2014 at 3:25am*

**Physics help please **

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 ...
*Friday, November 7, 2014 at 9:36pm*

**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? show steps please!
*Friday, November 7, 2014 at 9:32pm*

**physics**

Two cars leave the same point at the same time, each travelling at the same constant speed of 89.0 km/h and each having the same mass. However, the first car drives directly east, while the second car heads directly south. At what speed (the magnitude of the velocity) is the ...
*Friday, November 7, 2014 at 9:07pm*

**physics**

Calculate the escape velocity on the surface ov moon .Given the radius of moon=1.7×10(raise to power 6)m and mass of moon =7.35×10(raise to power 22)kg
*Friday, November 7, 2014 at 9:05pm*

**physics**

A projectile is thrown from the top of a tower anf strikes the ground after 3sec at angle of 45° with horizontal . Find height of tower and speed with which the projectile was projected.
*Friday, November 7, 2014 at 8:54pm*

**physics**

a school bus traveling along a straight road from school was found to be 2.0km North of the school 4minutes later. In another 4minutes it was 4km West of the school. Draw the position of the bus from school.
*Friday, November 7, 2014 at 8:53pm*

**Physics**

calculate the escape velocity on the surface of earth, acceleration due to gravity will be 36 percent of its value on the surface of earth .if mean radius is 6400 km?
*Friday, November 7, 2014 at 8:51pm*

**physics**

Two cars leave the same point at the same time, each travelling at the same constant speed of 89.0 km/h and each having the same mass. However, the first car drives directly east, while the second car heads directly south. At what speed (the magnitude of the velocity) is the ...
*Friday, November 7, 2014 at 8:39pm*

**physics**

Two cars leave the same point at the same time, each travelling at the same constant speed of 89.0 km/h and each having the same mass. However, the first car drives directly east, while the second car heads directly south. At what speed (the magnitude of the velocity) is the ...
*Friday, November 7, 2014 at 7:41pm*

**Chemistry Physics**

How many joules of heat need to be removed to condense 1.50 kg of steam at 100°C -Specific Heat for steam is 2000 J/kg°C-
*Friday, November 7, 2014 at 7:41pm*

**Physics Math**

How many joules of heat need to be removed to condense 1.50 kg of steam at 100°C -Specific Heat for steam is 2000 J/kg°C-
*Friday, November 7, 2014 at 7:32pm*

**Physics Science**

How many kilocalories of heat are required to melt 20.0 kg of ice at 0°C? Okay so the given is m=20.0kg Ti=0°C HeatFusionIce=80 kcal/kg
*Friday, November 7, 2014 at 7:15pm*

**physics**

Two cars leave the same point at the same time, each travelling at the same constant speed of 89.0 km/h and each having the same mass. However, the first car drives directly east, while the second car heads directly south. At what speed (the magnitude of the velocity) is the ...
*Friday, November 7, 2014 at 6:40pm*

**Physics**

A pendulum consists of a 2.1 kg stone swinging on a 3.6 m string of negligible mass. The stone has a speed of 7.9 m/s when it passes its lowest point. (a) What is the speed when the string is at 60° to the vertical? (b) What is the greatest angle with the vertical that the...
*Friday, November 7, 2014 at 6:23pm*

**Physics**

A plane is flying horizontally with speed 251 m/s at a height 2180 m above the ground, a package is thrown downward from the plane with a vertical speed v1 = 80 m/s. What is the magnitude of the total velocity of the package at the moment it is thrown as seen by an observer on...
*Friday, November 7, 2014 at 5:07pm*

**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. The ...
*Friday, November 7, 2014 at 4:48pm*

**physics**

A cannon fires a 0.598 kg shell with initial velocity 10 m/s in the direction 46◦ above the horizontal. The shell’s trajectory curves downward be- cause of gravity, so at the time t = 0.53 s the shell is below the straight line by some verti- cal distance ∆h. ...
*Friday, November 7, 2014 at 4:46pm*

**physics**

A tank contains 12.2 g of chlorine gas (Cl2) at a temperature of 84 °C and an absolute pressure of 5.60 × 105 Pa. The mass per mole of Cl2 is 70.9 g/mol. (a) Determine the volume of the tank. (b) Later, the temperature of the tank has dropped to 26 °C and, due to...
*Friday, November 7, 2014 at 4:25pm*

**physics**

Find the displacement of the car after 5.9 s. Answer in units of m
*Friday, November 7, 2014 at 3:21pm*

**physics**

A steel ball of mass m=5 g is moving at a speed of 250 m/s toward a large mass M=2.2 kg which is connected to a relaxed spring, as shown below. When the ball reaches the large mass it collides and bounces off without losing any kinetic energy. The large mass is connected to a ...
*Friday, November 7, 2014 at 2:08pm*

**physics **

Static friction is smaller than kinetic friction because it is harder to keep an object than moving than to put it in motion.
*Friday, November 7, 2014 at 1:33pm*

**physics**

A remote-controlled toy car of mass 2.2 kg starts from rest at the origin at t = 0 and moves in the positive direction of an x axis. The net force on the car as a function of time is given by the figure. (a) What is the time rate of change of the momentum of the car at t = 3.0...
*Friday, November 7, 2014 at 12:53pm*

**physics**

A box is put on a scale that is marked in units of mass and adjusted to read zero when the box is empty. A stream of marbles is then poured into the box from a height h = 6.93 m above its bottom at a rate of R = 128 (marbles per second). Each marble has mass m = 7.14 g. If the...
*Friday, November 7, 2014 at 12:50pm*

**Physics**

If rocket had been 10 m above the ground when its horizontal distance from the launchpad was 2m ,wheredo you think rocket would have landed
*Friday, November 7, 2014 at 10:33am*

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