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August 27, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
A can of gasoline has a rectangular base with dimensions of 13.5 cm by 13 cm. If there are 3 liters of gasoline in the can, how much does the surface of the gasoline rise (in mm) in the can when the temperature is raised by 45C? The coefficient for volume expansion of gasoline...
Friday, January 17, 2014 at 5:35pm

Physics
By what amount will a 178 m long concrete slab on the Mackinac Bridge contract when going from +39C to -35C? The linear expansion coefficient is 10^-5 per C.
Friday, January 17, 2014 at 5:28pm

physics
A weight lifter lifts a set of weights a vertical distance of 2.07 m. If a constant net force of 335 N is exerted on the weights, how much net work is done on the weights? Answer in units of J
Friday, January 17, 2014 at 4:46pm

Physics
I'm super confused about how to approach this problem. Please help. A ball of Styrofoam (ρ = 100 kg/m3) is totally submerged in water. The ball has a mass of 300.0 g What is the volume of the ball? If a string holds the ball when it’s in the water, what’s ...
Friday, January 17, 2014 at 1:03pm

physics
A spring of stiffness 127 N/m, and with relaxed length 0.19 m, stands vertically on a table, as shown in the figure. Instead of compressing the spring with a heavy block, with your hand you push straight down on the spring until your hand is only 0.14 m above the table. (...
Friday, January 17, 2014 at 11:54am

Physics
A cubical block of wood 0.100 m on a side and with a density 550 kg/m^3 of floats in a jar of water. Oil with a density of 750 kg/m^3 is poured on the water until the top of the oil layer is 0.035 m below the top of the block. 1. How deep is the oil layer? Please tell me the ...
Friday, January 17, 2014 at 7:57am

physics
A submarine is at a depth of 96.0 m under the ocean surface. The inside of the submarine is kept at atmospheric pressure. What is the net force being exerted on a circular window of the submarine that has a radius of 35 cm? The density of the ocean water is 1030 kg/m3
Friday, January 17, 2014 at 12:08am

Physics
An antiproton (same mass as the proton, charge -e) is at the observation location. What is the force on the antiproton, due to the π-?
Thursday, January 16, 2014 at 9:43pm

physics
Suppore the ceiling in the previous problem is that of an elevator which is going up with an acceleration of 2.0 m/s square. Find the elongations.
Thursday, January 16, 2014 at 9:35pm

Physics
Bryan tosses a 75.0 g rock into the lake. The rock leaves hus hand at a height of 175 cm above the ground travelling at 19.0 m/s. How high above the ground will the rock travel if it is accidentally thrown straight up? How high above the water will it travel if it is thrown in...
Thursday, January 16, 2014 at 8:56pm

Physics
Bryan tosses a 75.0 g rock into the lake. the rock leaves hus hand at a height of 175 cm above the ground travelling at 19.0 m/s. How high above the ground will the rock travel if it us accidentally bryan tosses a 75.0 g rock into the lake. The rock leaves hus hand at a height...
Thursday, January 16, 2014 at 8:54pm

physics
two forces 5N and 7N act on an object respectively.When will the resultant of the two vectors be at a maximum?
Thursday, January 16, 2014 at 8:32pm

Math/Physics
The Milky Way Galaxy is 100000 light years across. The Sun is located about 30000 light years from the galactic center and revolves around it with a period of 2e8 years. All the stars inside the sun's orbital radius is to be concentrated at the galactic center, as if they ...
Thursday, January 16, 2014 at 7:53pm

PHYSICS
5 kg cart is at the bottom of a 10 m hill. For the cart to reach the top of the hill, what is the minimum kinetic energy of the cart?
Thursday, January 16, 2014 at 7:36pm

Physics
Three objects with masses m1= 36.5 kg m2= 19.2 kg m3= 12.5 kg Are hanging from massless ropes that run over a frictionless pulleys. If the system is released from rest, what is the magnitude of the acceleration in m/s^2 of mass m1? ___________________ O O O I I I I I I I I I I...
Thursday, January 16, 2014 at 7:20pm

Physics
Three objects with masses m1= 36.5 kg m2= 19.2 kg m3= 12.5 kg Are hanging from massless ropes that run over a frictionless pulleys. If the system is released from rest, what is the magnitude of the acceleration in m/s^2 of mass m1? ___________________ O O O I I I I I I I I I I...
Thursday, January 16, 2014 at 7:20pm

Physics
An elevator motor provides 45.0 kW of power while lifting a 2000 kg elevator 35 m. If the elevator contains six passengers of the same mass and it takes 20.0 s to accomplish this task, determine the mass of each passenger. Assume the system is 83 % efficient.
Thursday, January 16, 2014 at 7:11pm

Physics
A microwave rated at 1000 W heats a 500 g glass of water from 10 degrees C to 55 degrees C in 2 minutes. Determine the efficiency of the energy transformation.
Thursday, January 16, 2014 at 7:05pm

Physics
A track is mounted on a large wheel that is free to turn with negligible friction about a vertical axis. A toy train of mass m = 0.140 is placed on the track and, with the system initially at rest, the train's electrical power is turned on. The train reaches a steady speed...
Thursday, January 16, 2014 at 6:48pm

Physics
A farmer drives a 0.100 kg iron spike with a 2.00 kg sledge hammer. The sledge hammer moves at a constant speed of 3.99 m/s until it comes to rest on the spike after each swing. Assuming all the energy is absorbed by the nail, and ignoring the work done by the nail on the ...
Thursday, January 16, 2014 at 5:34pm

Physics
A 599 g piece of silver at 150 degrees C is submerged in 1000 g of water at 5 degrees C to be cooled. Determine the final temperature of he silver and water given Heat capacity of water= 4.18 x 10^3 j/kg degrees C Heat capacity of silver= 2.49 x 10^2 j/kg degrees C
Thursday, January 16, 2014 at 5:17pm

Physics
A mechanic uses a chain and block to lift a 875-kg engine 4.00 m to the top of the garage. The downward force in the chain over the 4.00 m distance is 5.00 x 10^4 N. How much useful work was done? Thannnkkks :)
Thursday, January 16, 2014 at 5:09pm

Physics
A mechanic uses a chain and block to lift a 875-kg engine 4.00 m to the top of the garage. The downward force in the chain over the 4.00 m distance is 5.00 x 10^4 N. A) Calculate the work done in raising the motor B) How much useful work was done? C) What is the efficiency of ...
Thursday, January 16, 2014 at 4:18pm

physics
A metal sphere hangs from a string and has 2 kg of mass. The sphere has a charge of +7.1 µC. A uniform electric field is turned on and directed to the right.
Thursday, January 16, 2014 at 3:11pm

Physics 212
The armature of an ac generator has 100 turns. Each turn is a rectangular loop measuring 8.0 cm by 12 cm. The generator has a sinusoidal voltage output with an amplitude of 24 V. If the magnetic field of the generator is 250 mT, a) With what frequency does the armature turn? b...
Thursday, January 16, 2014 at 10:05am

Physics
A 1.25 kg skateboard is coasting along the pavement at a speed of 5.04 m/s when a 0.640 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination? Answer in units of m/s Your answer must be within ± 1.0%
Thursday, January 16, 2014 at 2:14am

physics
How long will it take a sample of polonium-210 with a half-life of 140 days to decay to one-sixty-fourth of its original strength?
Wednesday, January 15, 2014 at 8:10pm

Physics
A 13 kg asteroid is traveling through space with velocity v = 110 m/s when it breaks up into three equal pieces. One piece is left at rest, and a second one continues with same velocity. What was the energy of the explosion?
Wednesday, January 15, 2014 at 6:41pm

Physics
Calculate the impulse (in kgm/s) received by a football when it's kicked in a kickoff. The ball has a mass of 0.27 kg and travels a horizontal distance of 68 m. The ball is kicked at an angle q of 20.5 with the horizontal and spends 2.276 seconds in the air.
Wednesday, January 15, 2014 at 6:41pm

Physics
By what amount will a 178 m long concrete slab on the Mackinac Bridge contract when going from +39C to -35C? The linear expansion coefficient is 10^-5 per C.
Wednesday, January 15, 2014 at 5:45pm

physics
A 91 kg student eats a 200 Calorie doughnut. To “burn it off”, he decides to climb the steps of a tall building. (1 food Calorie = 10^3 Calories.) How high would he have to climb to expend an equivalent amount of work? The acceleration of gravity is 9.8 m/s2
Wednesday, January 15, 2014 at 5:41pm

Physics
One student generates a short, loud sound of wavelength 0.7576 m. Another student, who is 100 m away, hears the sound exactly 0.300 s later. What is the frequency of this sound? Please help
Wednesday, January 15, 2014 at 5:19pm

physics
A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 4.5 m/s. How much work was done by friction as the child goes down the slide?
Wednesday, January 15, 2014 at 4:49pm

physics
A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 4.5 m/s. How much work was done by friction as the child goes down the slide?
Wednesday, January 15, 2014 at 4:28pm

physics
A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 4.5 m/s. How much work was done by friction as the child goes down the slide?
Wednesday, January 15, 2014 at 4:21pm

Physics
Two forces of 5N and 7N respectively act on an object,what are the maximum and minimum resultants of the two vectors
Wednesday, January 15, 2014 at 2:01pm

URGENT! PLEASE HELP QUICK PHYSICS
Summarize two observations that are contrary to the predictions based on Newton’s laws but that confirm Einstein’s explanation of gravity. Indicate how the predictions based on Newton’s theory differ from Einstein’s.
Wednesday, January 15, 2014 at 1:37pm

Physics
Two Students are pulling on a box initially at rest with a mass of 13.5 kg on a frictionless surface. Student #1 is applying a force of 16.5 N to the left while student #2 is apply a force of 3.7 N to the right. Find the velocity of the box after 6 sec
Wednesday, January 15, 2014 at 1:18pm

Physics
Which produces the largest torque? 30.0 N perpendicular to the center of rotation at a radius of 1.5 m 30.0 N perpendicular to the center of rotation at a radius of 0.25 m 60.0 N perpendicular to the center of rotation at a radius of 1.0 m 60.0 N perpendicular to the center of...
Wednesday, January 15, 2014 at 12:46pm

URGENT: Please help with Physics
Suppose the mass of each of two spherical objects is doubled, and the distance between their centers is three times as large. How is the magnitude of the force of gravity between them affected? (Points : 5) It is 4/9 as large. It is 4/3 as large. It is 2/9 as large. It is 3/2...
Wednesday, January 15, 2014 at 12:37pm

PHYSICS, please help quickly
The velocity of an object increases from 5.0 m/s to 15 m/s in 2.0 s. What is the average acceleration of the object? -10 m/s2 -5.0 m/s2 +5.0 m/s2 +10 m/s2
Wednesday, January 15, 2014 at 12:09pm

physics
revolving astronomer are subjected to acceleration by force the centripetal force against the centrifuge the radius of the centrifuge is 10 M .Calculate centripetal force on an astronaunt of mass 9.9 KG?
Wednesday, January 15, 2014 at 2:44am

Physics
A bullet whose mass is 0.0015kg leaves a 5kg leaves a 5kg rifle at a muzzle velocity of 800 m/s. It strikes a 7kg block of wood and becomes embedded in it. After the bullet hits the rock, what is the speed of the bullet/ block system?
Wednesday, January 15, 2014 at 2:16am

Physics please help.
A ball of Styrofoam (ρ = 100 kg/m3) is totally submerged in water. The ball has a mass of 300.0 g (it could be a pretty big block). What is the volume of the ball? If a string holds the ball when it’s in the water, what’s the tension in the string?
Wednesday, January 15, 2014 at 1:29am

Physics
Magnetic force between two poles is 80 unit. Separation between poles is doubled. What is force between them?
Wednesday, January 15, 2014 at 12:38am

physics
When a 57.0 gram tennis ball is served, it accelerates from rest to a speed of 46.5 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 44.8 cm. What is the magnitude of the net force acting on the ball in newtons?
Tuesday, January 14, 2014 at 10:58pm

physics
When a water gun is fired while being held horizontally at a height of 1.14 m above ground level, the water travels a horizontal distance of 4.50 m. A child, holding the same gun in a horizontal position, slides down a 34.0◦ incline at a con- stant speed of 1.98 m/...
Tuesday, January 14, 2014 at 10:56pm

Physics
If you stood atop a ladder that was so tall that you were twice as far from Earth's center, how would your weight compare with its present value?
Tuesday, January 14, 2014 at 10:15pm

Physics
To better comprehend the magnitude of the gravitational force between Earth and the moon, pretend gravity is turned off and the pull replaced by the tension in a steel cable need to be?
Tuesday, January 14, 2014 at 10:13pm

Physics
Find an arrangement of a 50-g, a 100-g, a 200-g and a 500-g mass that balances. Show all the calculations and indicate the positions the mass should occupy.
Tuesday, January 14, 2014 at 10:09pm

Physics
If a 100-g mass was placed at the 25-cm mark, and a 20-g mass at the 10-cm mark, where should a 500-g mass be placed to balance the system?
Tuesday, January 14, 2014 at 10:08pm

physics
When a high-speed passenger train traveling at 98 mi/h rounds a bend, the engineer is shocked to see that a locomotive has improperly entered onto the track from a siding 0.42 mi ahead. The locomotive is moving at 16 mi/h. The engineer of the passenger train immediately ...
Tuesday, January 14, 2014 at 10:02pm

physics
If the position of a particle is given by x = 35t - 7t^3, where x is in meters and t is in seconds, answer the following questions. (a) When, if ever, is the particle's velocity zero? (Enter the value of t or 'never'.) (b) When is its acceleration a zero?
Tuesday, January 14, 2014 at 9:31pm

Physics
Five Boys are pushing a snowball, and each is pushing with a force of 10.0N. However, each boy is pushing in a different direction. They are pushing north, northeast, east, southeast, and south. (Each boy is pushing at an angle of 45.0 degrees relative to his neighbor.) What ...
Tuesday, January 14, 2014 at 7:57pm

Physics
On planet X, the alien residents use a temperature scale in which they define 0 degrees X to be the melting point of nitrogen and 100 degrees X to be the boiling point of nitrogen. What temperature difference in X degrees does a temperature change of 1 C degree correspond to? ...
Tuesday, January 14, 2014 at 5:28pm

please check this Physics
A 5kg block slides along a frictionless surface at 8 m/s toward a second block that is 2kg and attached to the end of a spring,The spring has a constant of 250N/m . When the blocks collide they stick together. What is the speed of the two blocks immediately after the collision...
Tuesday, January 14, 2014 at 2:41pm

physics
if u have swam one lap in a swimming pool, that means from one end to the other and back. In 3.5 h, a swimmer makes exactly 60 laps in the pool, that is 40 m long. Determine the distance the swimmer traveled, the total displacement of the swimmer, the swimmer's average ...
Tuesday, January 14, 2014 at 12:41pm

physics
a vertical dock gate is 5m wide and is hinged at 1m from the base of the dock. the dock has sea water with density of 1025 kg /m^3 to a depth of 7.5 on one side and fresh water to depth of 3m on the other side a) find the resultant horizontal force b) Determine the overtunning...
Monday, January 13, 2014 at 8:50pm

PHYSICS
n the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a non-linear way, especially at high altitude. To a ...
Monday, January 13, 2014 at 5:34pm

Physics
A machine in an ice factory exerts 3.06 ✕ 102 N of force to pull a large block of ice up a frictionless slope at constant speed. The force is applied parallel to the slope, and the weight of the block is 1.39 ✕ 104 N. What is the angle of the slope?
Monday, January 13, 2014 at 4:57pm

Physics
Another pendulum swings to and fro at a regular rate of two times per second. Show that its period is 0.5 s.
Monday, January 13, 2014 at 3:02pm

physics
if a pendulum clock keeping at sea level is taken at depth h=1km below sea level then the clock approximately gives time is a.gain 13.5 s per day b.loses 13.5s per day c.loses 7 s per day d.gains 7 s per day
Monday, January 13, 2014 at 12:57pm

physics
A 10-g metal ball is moving to the left with a velocity of magnitude 0.4 m/s has a head-on, elastic collision with a larger 30-g metal ball moving to the right with a velocity of magnitude 0.2 m/s.
Monday, January 13, 2014 at 12:21pm

Physics
suppose you have 3 resistors, each of value 0f 30 omega. List all the different resistances that you can obtain by combining them
Monday, January 13, 2014 at 7:25am

physics
A projectile is fired at an angle of 30ᵒ above the horizontal from the top of the cliff 600 ft high. The initial speed of the projectile is 2000 ft/s. how far will the projectile move horizontally before it hits the level ground at the base of the cliff?
Monday, January 13, 2014 at 1:06am

Physics
how much energy is required to change 40 g of ice at -10 C to steam at 110 C?
Sunday, January 12, 2014 at 9:46pm

Physics
a ball is given a velocity of 3.89 m/s at an angle of 32 degrees. Calculate the maximum height and the range of the ball after 5.0s.
Sunday, January 12, 2014 at 9:38pm

Physics
A car traveling with an initial velocity of 68 km/h accelerates uniformly at a rate of 1.35 m/s^2 for 4.7s. Find the final speed and displacement of the car during the specified time interval.
Sunday, January 12, 2014 at 9:26pm

physics
A mountain biker rides a given distance due north, then drives twice that far to the west. At the end of the trip the direct distance from the starting point is 112meters. What is the length of each leg of the trip and in which direction is the end point?
Sunday, January 12, 2014 at 8:57pm

Physics
A bus slows down uniformly from 75 km/h to 15 km/h in 12.55 s. How far did the car travel before stopping?
Sunday, January 12, 2014 at 8:57pm

Physics
Henry walks 20 km west forgot his coat, so he turns and heads 13 km east. He decided to go another path to make up for the lost time and travels 30 km south and then moves west for 27 km. Calculate Henry's displacement.
Sunday, January 12, 2014 at 8:50pm

physics
A child and a sled have a combined mass of 87.5 kg slides down a friction-less hill that is 7.34 m high. If the sled starts from rest, what is the velocity of the sled at the bottom of the hill?
Sunday, January 12, 2014 at 8:42pm

Physics
Three spiders are resting on the vertices of a triangular web. The sides of the triangular web have a length of a = 0.85 m, as depicted in the figure. Two of the spiders (S1 and S3) have +7.7 µC charge, while the other (S2) has −7.7 µC charge. a)What are the ...
Sunday, January 12, 2014 at 5:37pm

Physics
Problem 3- A 10-g metal ball is moving to the left with a velocity of magnitude 0.4 m/s has a head-on, elastic collision with a larger 30-g metal ball moving to the right with a velocity of magnitude 0.2 m/s. a) Find the speed of the two balls after the collision. b) If the ...
Sunday, January 12, 2014 at 1:14pm

Physics
Problem 2- A 15 kg block is attached to a very light horizontal spring of force constant 400 N/m and is resting on a smooth horizontal table as shown in the figure below. Suddenly it is struck by a 3 kg stone traveling horizontally at 8 m/s to the right, whereupon the stone ...
Sunday, January 12, 2014 at 1:14pm

Physics
Problem 1- A 0.5 kg ball is moving to the right at 5 m/s when it is suddenly collide by a wall that exerts on it a horizontal force of 2.5 N for a period of 0.8 s. a) What is the impulse does the force of the wall exert on the ball? b) What is the velocity of the ball after ...
Sunday, January 12, 2014 at 1:13pm

Physics
Bees often work together for the greater good of the hive. Sometimes they can get excess charge on them. Four pairs of bees, which can be represented as identical, conducting spheres, bump into each other in the hive. Rank the bees in the order of the size of the magnitude of ...
Sunday, January 12, 2014 at 12:57pm

physics
A small cube of mass m1= 2.0 kg slides down a circular and frictionless track of radius R= 0.6 m cut into a large block of mass m2= 5.0 kg as shown in the figure below. The large block rests on a horizontal and frictionless table. The cube and the block are initially at rest, ...
Sunday, January 12, 2014 at 12:22pm

physics Classical Mechanics
A pendulum of mass m= 0.9 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum is measured from the ...
Sunday, January 12, 2014 at 9:26am

PHYSICS(HELP)
In the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a non-linear way, especially at high altitude. To a...
Sunday, January 12, 2014 at 9:25am

PHYSICS(HELP)
A small block of mass m=1 kg glides down (without friction) a circular track of radius R=2 m, starting from rest at height R. At the bottom of the track it hits a massless relaxed spring with spring constant k= 11 N/m, which starts to be compressed as the block continues to ...
Sunday, January 12, 2014 at 5:54am

physics
A pelican flying along a horizontal path drops a fish from a height of 4.3 m. The fish travels 8.3 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s
Saturday, January 11, 2014 at 10:59pm

Physics
A train traveling at a speed of 110 km/h uniformly decelerates for 20 seconds. During that time it travels 450m. A) What is the acceleration? (m/s^2) B) What is its speed after deceleration? (km/h) A ANS = -.805m/s^2 B ANS = 52km s = 450m t = 20 seconds u = 110km/h*1000m/km /...
Saturday, January 11, 2014 at 10:29pm

Physics
Two uniform solid spheres have the same mass of 3 kg, but one has a radius of 0.25 m while the other has a radius of 0.8 m. Each can rotate about an axis through its center. (a) What is the magnitude τ of the torque required to bring the smaller sphere from rest to an ...
Saturday, January 11, 2014 at 6:44pm

PHYSICS(HELP)
A pendulum of mass m= 0.8 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum is measured from the ...
Saturday, January 11, 2014 at 4:19pm

physics
Pls help me with this, The resistance of a platinum resistance thermometer is 30 ohms at the ice point, 40 ohms at the steam point and 34.5 ohms on a certain hot day, what is the temperature of the day on celcius temperature day?
Saturday, January 11, 2014 at 3:23pm

Physics Please check my answer
Okay, so I've figured this much out on my own, I just need help with the next part. It's a two block system with a friction of .20 a hanging mass of 7.5 kg and mass on the table at 10 kg. I got 3.08 m/s^2 for the acceleration and I got 22.8 N for the tension in the ...
Saturday, January 11, 2014 at 2:23pm

Physics
The gravitational force of attraction between two students sitting at their desks in physics class is 2.35 ✕ 10-8 N. If one student has a mass of 46.2 kg and the other student has a mass of 62.6 kg, how far apart are the students sitting?
Saturday, January 11, 2014 at 1:44pm

Physics
Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 11.6 m long. His speed at the bottom of the swing is 7.4 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 ...
Saturday, January 11, 2014 at 1:22pm

physics
Under what circumstances does a double convex lens produce an image that is reversed left to right?
Saturday, January 11, 2014 at 12:42pm

Physics Please check my answer
1. Which of the following are conserved in a totally inelastic collision? Only momentum Only kinetic energy Both momentum and kinetic energy Neither momentum nor kinetic energy <--- It depends on the objects. 2. Two skaters stand face to face. Skater 1 has a mass of 55 kg, ...
Saturday, January 11, 2014 at 10:13am

physics
The resistance of a platinum resistance thermometer is 30 ohms at the ice point, 40 ohms at the steam point and 34.5 ohms on a certain hot day, what is the temperature of the day on celcius temperature day?
Saturday, January 11, 2014 at 10:04am

physics
The resistance of a platinum resistance thermometer is 30 ohms at the ice point, 40 ohms at the steam point and 34.5 ohms on a certain hot day, what is the temperature of the day on celcius temperature day?
Saturday, January 11, 2014 at 10:04am

Physics
dT/dz=−α for z≤11 km where α=6.5 K/km (Kelvin per km) and z is the height above the sea level. The temperature stays then approximately constant between 11 km and 20 km above sea level. Assume a temperature of 5 ∘C and a pressure of 1 atm at sea ...
Saturday, January 11, 2014 at 5:58am

PHYSICS
dT/dz=−α for z≤11 km where α=6.5 K/km (Kelvin per km) and z is the height above the sea level. The temperature stays then approximately constant between 11 km and 20 km above sea level. Assume a temperature of 5 ∘C and a pressure of 1 atm at sea ...
Saturday, January 11, 2014 at 5:47am

physics
A small cube of mass m1= 1.0 kg slides down a circular and frictionless track of radius R= 0.4 m cut into a large block of mass m2= 4.0 kg as shown in the figure below. The large block rests on a horizontal and frictionless table. The cube and the block are initially at rest, ...
Saturday, January 11, 2014 at 3:36am

physics
A hunter with a gun of maximum range 200 meters tries to shoot a leopard sitting in a tree. The tree is at a distance of 100 m from the hunter and the leopard is sitting at a height of 2 m from the ground. In order to be able to hit the leopard
Friday, January 10, 2014 at 11:03pm

physics
8. A spring is compressed a distance of 0.15 m from its rest position and held in place while a ball of mass 0.150 kg is placed at its end. When the spring is released, the ball leaves the spring traveling at 9.0 m/s. What is the spring constant? 540 N/m 450 N/m 60 N/m 225 N/m...
Friday, January 10, 2014 at 10:59pm

Physics help
I'm trying to calculate the tension in a rope. The two ropes are holding up a picture frame that is 100N, each rope is at a 45 degree angle. I'm trying to find the value of the tension of the 1st rope. Please help
Friday, January 10, 2014 at 10:56pm

physics help
A pendulum of mass m= 0.8 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum is measured from the ...
Friday, January 10, 2014 at 8:50pm

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