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December 19, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
Batman (mass = 75.6 kg) jumps straight down from a bridge into a boat (mass = 631 kg) in which a criminal is fleeing. The velocity of the boat is initially +10.4 m/s. What is the velocity of the boat after Batman lands in it?
Thursday, December 4, 2014 at 7:19pm

Physics
A 2.86-g bullet, traveling at a speed of 452 m/s, strikes the wooden block of a ballistic pendulum, such as that in Figure 7.14. The block has a mass of 230 g. (a) Find the speed of the bullet/block combination immediately after the collision. (b) How high does the combination...
Thursday, December 4, 2014 at 7:18pm

Physics
A projectile, fired with unknown initial velocity, lands 18.4 s later on the side of a hill, 2740 m away horizontally and 469 m vertically above its starting point. (Ignore any effects due to air resistance.) (a) What is the vertical component of its initial velocity? 115.741 ...
Thursday, December 4, 2014 at 7:12pm

physics
A projectile is fired into the air from the top of a cliff of height h = 186 m above a valley. Its initial velocity is v0 = 64.8 m/s at an angle θ = 59° above the horizontal. Where does the projectile land? (Ignore any effects due to air resistance.)
Thursday, December 4, 2014 at 6:40pm

Physics
Question: A force of 25N pushes a curling rock from rest 1.0 m across a frictionless surface. Find the FINAL kinetic energy. attempts: Well i guess it would be changeinEk so i tried Wnet=changeinEk fnet x changeinD = 1/2mvf^2-1/2mvi^2 to fnet x changeinD +1/2mvi^2=1/2mvf^2 ...
Thursday, December 4, 2014 at 5:56pm

physics
A 90-kilogram physics student would weigh 2970 Newtons on the surface of planet X. What is the magnitude of the acceleration due to gravity on the surface of planet X?
Thursday, December 4, 2014 at 4:47pm

Physics
Question: A force of 25N pushes a curling rock from rest 1.0 m across a frictionless surface. Find the FINAL kinetic energy. attempts: Well i guess it would be changeinEk so i tried Wnet=changeinEk fnet x changeinD = 1/2mvf^2-1/2mvi^2 to fnet x changeinD +1/2mvi^2=1/2mvf^2 ...
Thursday, December 4, 2014 at 4:31pm

physics
A blue puck has a velocity of 3i –4j m/s. Its mass is 20 kg. What is its momentum?
Thursday, December 4, 2014 at 2:45pm

physics
A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.30 m × 2.22 m. On a certain day, the indoor temperature is 22°C and the outdoor temperature is 0°C. (Assume the thermal conductivity of the glass is 0.8 J/s · m · °C.) What is...
Thursday, December 4, 2014 at 12:09pm

physics
If the acceleration due to gravity on the earth is 9.8 m/s2, what is the acceleration due to gravity on Rams?
Thursday, December 4, 2014 at 11:06am

physics
A projectile is fired into the air from the top of a cliff of height h = 186 m above a valley. Its initial velocity is v0 = 64.8 m/s at an angle θ = 59° above the horizontal. Where does the projectile land? (Ignore any effects due to air resistance.)
Thursday, December 4, 2014 at 9:49am

physics
A river 400 m wide is flowing at a rate of 2.0 m/s. A boat is sailing at a velocity of 10 m/s with respect to the wate, in a direction perpendicular to the river. (a) Find the time taken by the boat to reach the opposite bank. (b) How far from the point directly opposite to ...
Thursday, December 4, 2014 at 7:58am

physics
A stone thrown horizontally from the top of a 18-m tower hits the ground at a point 18 m from the base of the tower. (Ignore any effects due to air resistance.) (a) Find the speed at which the stone was thrown. m/s (b) Find the speed of the stone just before it hits the ground...
Thursday, December 4, 2014 at 7:35am

physics
A 0.59 kg rubber ball has a speed of 1.50 m/s at point A and kinetic energy of 7.0 J at point B. (a) Determine the ball's kinetic energy at A Correct: Your answer is correct. J (b) Determine the ball's speed at B
Wednesday, December 3, 2014 at 11:05pm

Physics
A two head collision. One car weighs 45000 newtons and going at 15 meters per second. The other car is traveling at 25 meters per second and weighs 9000 newtons. How would I calculate velocity?
Wednesday, December 3, 2014 at 10:59pm

Physics
You throw a ball towards a wall at 15ms-1, and it bounces back at 10ms-1. What is the total change in velocity? (the answer is not 5m/s)
Wednesday, December 3, 2014 at 10:32pm

physics
A 58.0 kg pole vaulter running at 8.9 m/s vaults over the bar. If the vaulter's horizontal component of velocity over the bar is 1.0 m/s and air resistance is disregarded, how high was the jump?
Wednesday, December 3, 2014 at 10:10pm

physics
Dolphins of the open ocean are classified as Type II Odontocetes (toothed whales). These animals use ultrasonic "clicks" with a frequency of 54.9 kHz to navigate and find prey. Suppose a dolphin sends out a series of clicks that are reflected back from the bottom of ...
Wednesday, December 3, 2014 at 8:59pm

physics
A guitar string 61.8 cm long vibrates with a standing wave that has three antinodes. Which harmonic is this?
Wednesday, December 3, 2014 at 8:58pm

College Physics
Suppose a 10.0 kg fireworks shell is shot into the air with an initial velocity of 62.0 m/s at an angle of 80.0 degrees above the horizontal. At the highest point of its trajectory, a small explosive charge separates it into two pieces, neither of which ignite (two duds). One ...
Wednesday, December 3, 2014 at 8:22pm

Physics
A block of mass m is pulled across a level surface by a rope that makes an angle θ with the horizontal. The coefficient of friction is μ. (a) Determine the amount of force F required to slide the block at a constant velocity. (b) Determine the optimum angle at which ...
Wednesday, December 3, 2014 at 7:49pm

physics
A man pushes 100.0 N on the handle of a 40.0 kg lawnmower. The applied force is in the same direction as the handle, which is tilted 35.0° relative to horizontal. The coefficient of kinetic friction is 0.10. Find the amount of acceleration.
Wednesday, December 3, 2014 at 7:46pm

physics
An object of mass 2.0 kg starts from rest at the top of a frictionless curved ramp. At the bottom, it collides with and sticks to another 2.0-kg mass object. Together the objects then cross a small rough section where there is friction before leaving the edge of the table ...
Wednesday, December 3, 2014 at 6:10pm

Physics
The engine of an automobile develops 176 hp when rotating at a speed of 1340 rpm. What torque (in foot-pounds) does it deliver? I tried using some kinematic equations, but that didnt work at all. Then I tried doing something where I would take an integral, but then I dont know...
Wednesday, December 3, 2014 at 5:40pm

physics
a glider with a mass of 5 kg is moving to the right on a horizontal frictionless surface at 6 m/s when it collides with a 8 kg glider that is at rest. After the collision, the 8kg glider is moving to the right at 6 m/s. what are the speed and direction of the 5 kg glider ?
Wednesday, December 3, 2014 at 5:00pm

physics
A uniform ladder of mass 46 kg and 3.0 m in length is leaning against a frictionless vertical wall at an inclination of 60 degrees to the horizontal. A Window cleaner of mass 67.3 kg climbs up the ladder. What coefficient of friction between the ladder and ground is required ...
Wednesday, December 3, 2014 at 3:50pm

physics
Two identical guitar strings under 108 N of tension sound tones with frequencies of 528 Hz. The peg of one string slips slightly, and the tension in it drops to 91.0 N. How many beats per second are heard?
Wednesday, December 3, 2014 at 3:00pm

Physics
What's the difference between Inertia and Impulse? Because the definitions sound really similar.
Wednesday, December 3, 2014 at 2:38pm

physics
A 2.9-kg cart starts up an incline with a speed of 2.7 m/s and comes to rest 3.0 m up the incline. The total work done (the work of the net force) on the cart is:
Wednesday, December 3, 2014 at 1:02pm

Physics
Geologists place tiltmeters on the sides of volcanoes to measure the displacement of the surface as magma moves inside the volcano. Although most tiltmeters today are electronic, the traditional tiltmeter, used for decades, consisted of two or more water-filled metal cans ...
Wednesday, December 3, 2014 at 1:01pm

PHYSICS
A diving board length L = 5.20m that weighs 205N is supported by two pillars. One pillar is at the left end of the diving board, as shown below; the other is distance d = 1.70m away. Find the magnitude of the force exerted by the left pillar when a 90.0kg diver stands at the ...
Wednesday, December 3, 2014 at 12:20pm

Physics
A projectile, fired with unknown initial velocity, lands 18.4 s later on the side of a hill, 2740 m away horizontally and 469 m vertically above its starting point. (Ignore any effects due to air resistance.) (a) What is the vertical component of its initial velocity? m/s (b) ...
Wednesday, December 3, 2014 at 12:15pm

physics
if the radius from the discus to the axis of rotation is 1.4m, what is the linear velocity of the discus at the time of release?
Wednesday, December 3, 2014 at 11:35am

Physics
A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
Wednesday, December 3, 2014 at 9:47am

Physics
A projectile, fired with unknown initial velocity, lands 18.4 s later on the side of a hill, 2740 m away horizontally and 469 m vertically above its starting point. (Ignore any effects due to air resistance.) (a) What is the vertical component of its initial velocity? m/s (b) ...
Wednesday, December 3, 2014 at 9:17am

Physics
You are trying out for the position of place-kicker on a professional football team. With the ball teed 50.0 m from the goalposts with a crossbar 3.05 m off the ground, you kick the ball at 28 m/s and 31° above the horizontal. (a) Is the field goal attempt good? no yes (b...
Wednesday, December 3, 2014 at 9:08am

physics
A stretched string fixed at each end has a mass of 17 g and a length of 10.5 m. The tension in the string is 44.5 N. What is the vibration frequency for the third harmonic? Answer in Hz.
Wednesday, December 3, 2014 at 9:07am

Physics
The range of a cannonball fired horizontally from a cliff is equal to the height of the cliff. What is the direction of the velocity vector of the projectile as it strikes the ground? (Ignore any effects due to air resistance.) ° (below the horizontal)
Wednesday, December 3, 2014 at 9:02am

Physics
Elephants communicate via infrasound, at frequencies as low as 11 Hz that can travel up to 9 km. The intensity of these sounds can reach 106 dB, measured a distance of 4 m from the source. a) Determine the intensity level in W/m2 of the infrasound at 4 m from the source. b) ...
Wednesday, December 3, 2014 at 8:57am

Physics
A projectile is fired into the air from the top of a cliff of height h = 186 m above a valley. Its initial velocity is v0 = 64.8 m/s at an angle θ = 59° above the horizontal. Where does the projectile land? (Ignore any effects due to air resistance.)
Wednesday, December 3, 2014 at 8:53am

physics
An airplane traveling at v = 152 m/s emits a sound of frequency 1850 Hz. At what frequency does a stationary listener hear the sound as the plane approaches? Use 340 m/s for the speed of the sound and answer in Hz.
Wednesday, December 3, 2014 at 8:51am

physics
A 60 kg worker pulls buckets of sand from height of 10 m using a pulley fixed to a wooden beam.While he is pulling a 20 kg bucket filled with sand he slips and falls down holding the rope.Assuming that the worker did not collide with bucket,find the velocity of the worker at ...
Wednesday, December 3, 2014 at 8:23am

Physics
A stone thrown horizontally from the top of a 18-m tower hits the ground at a point 18 m from the base of the tower. (Ignore any effects due to air resistance.) (a) Find the speed at which the stone was thrown. m/s (b) Find the speed of the stone just before it hits the ground...
Wednesday, December 3, 2014 at 8:20am

physics
two ball A&B each have a chrge of 30micro C are apart 5cm ,what force does thecharge A exert on the charge B .At what distance will the force will be halved ?
Wednesday, December 3, 2014 at 8:03am

physics
A small crack occurs at the base of a 15.0 m high dam. The effective crack area through which water leaves is 1.30 *10-3 m2
Wednesday, December 3, 2014 at 7:38am

physics
A cannon barrel is elevated at an angle of 45°. It fires a ball with a speed of 250 m/s. (For the following questions, ignore air resistance.) (a) What height does the ball reach? m (b) How long is the ball in the air? s (c) What is the horizontal range of the cannon? km
Wednesday, December 3, 2014 at 7:34am

Physics
a 10m long steel cable is lifting a 30 ton crate upward off a ship. If the cable streches by .5cm under these conditions, determine the radius of the steel cable. Young's modulus of steel :2x10raised to 9 Pa
Wednesday, December 3, 2014 at 6:43am

Physics
An auditorium has dimensions 10m x 10m x 60m. How many moles of air fill this volume at STP? I'm stumped.
Wednesday, December 3, 2014 at 3:21am

physics
a car starts from rest it reaches a velocity of 12 m/s in 6 second. a. what is its acceleration ? b. if its acceleration remains the same what will be its velocity after 10 seconds?
Wednesday, December 3, 2014 at 1:53am

physics
michael is driving his sports car at 30m/s when he sees a dog on the road he slams on the breaks and comes to a stop in 3.0 second what is the acceleration of michael car?
Wednesday, December 3, 2014 at 1:50am

physics
The internal energy of a system changes because the system gains 180 J of heat and performs 338 J of work. In returning to its initial state, the system loses 111 J of heat. During this return process, what work is involved? If the work is done by the system, then give the ...
Wednesday, December 3, 2014 at 1:40am

physics
A fire helicopter carries a 565 kg bucket at the end of a 16.7 m long cable. When the helicopter is returning from a fire at a constant speed of 22.5 m/s, the cable makes an angle of 20.5 ◦ with respect to the vertical. Find the horizontal force exerted by air resistance...
Wednesday, December 3, 2014 at 1:16am

Calc Physics
Geologists place tiltmeters on the sides of volcanoes to measure the displacement of the surface as magma moves inside the volcano. Although most tiltmeters today are electronic, the traditional tiltmeter, used for decades, consisted of two or more water-filled metal cans ...
Wednesday, December 3, 2014 at 12:53am

physics
A 0.80-m aluminium bar is held with its length parallel to the east-west direction and dropped from a bridge. Just before the bar hits the river below, its speed is 22 m/s, and the emf induced across its length is 5 X 10-4 V. Assuming the horizontal component of the earth'...
Tuesday, December 2, 2014 at 11:19pm

Physics Quick
Quick question because i am trying to complete a lab report. How can i find the linear tangential acceleration of a wheel as it is turned by two hanging masses by using Newton's Second Law and the equation ΣT=Iα?
Tuesday, December 2, 2014 at 11:13pm

physics
An object of mass m has an elastic collision with another object initially at rest, and continues to move in original direction but with one-third its original speed. What is the mass of the other object in terms of m?
Tuesday, December 2, 2014 at 11:03pm

physics
a proton is projected perpendicularly into a magntic field that has a magnitude of 0.05T. the field is then adjusted so that an electron will follow a circular path of the same radius when it is projected perpendicularly
Tuesday, December 2, 2014 at 10:29pm

physics
how do you solve 3x^4 + 11x^3=4x^2
Tuesday, December 2, 2014 at 10:14pm

Physics
Quick question because i am trying to complete a lab report. How can i find the linear tangential acceleration of a wheel as it is turned by two hanging masses by using Newton's Second Law and the equation ΣT=Iα?
Tuesday, December 2, 2014 at 10:14pm

Physics
A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
Tuesday, December 2, 2014 at 8:03pm

physics
Two blocks with masses m1 = 1.20 kg and m2 = 2.90 kg are connected by a massless string, as shown in the Figure. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.300. Assume that the pulley has a negligible mass and ...
Tuesday, December 2, 2014 at 7:56pm

physics
Joyce and Efua are skating. Joyce pushes Efua, whose mass is 40.0 kg, with a force of 5.0 N. What is Efua's Resulting acceleration?
Tuesday, December 2, 2014 at 7:39pm

physics
A man weighs 750.0 N on Earth at what altitude will he weigh 187.5 N?
Tuesday, December 2, 2014 at 7:19pm

physics
The mass of a pendulum moves a total horizontal distance of 14cm in one cycle. What is the amplitude of the vibration?
Tuesday, December 2, 2014 at 5:19pm

physics
A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
Tuesday, December 2, 2014 at 3:32pm

Physics
A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 32.0 m above sea level, directed at an angle θ above the horizontal with an unknown speed v0. The projectile remains in flight for 6.00 ...
Tuesday, December 2, 2014 at 3:30pm

Physics
A proposed space station includes living quarters in a circular ring 50.5 m in diameter. At what angular speed should the ring rotate so the occupants feel that they have the same weight as they do on Earth?
Tuesday, December 2, 2014 at 2:54pm

Physics
Two blocks with masses m1 = 1.20 kg and m2 = 2.90 kg are connected by a massless string, as shown in the Figure. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.300. Assume that the pulley has a negligible mass and ...
Tuesday, December 2, 2014 at 2:54pm

Physics
A box of mass 10.9 kg with an initial velocity of 2.01 m/s slides down a plane, inclined at 38◦ with respect to the horizontal. The coefficient of kinetic friction is 1. The box stops after sliding a distance x. The acceleration due to gravity is 9.8 m/s. a. How far does...
Tuesday, December 2, 2014 at 2:13pm

Physics
A 284 kg crate is pulled along a level surface by an engine. The coefficient of kinetic friction between the crate and the surface is 0.513. How much power must the engine deliver to move the crate at a constant speed of 7.2 m/s?
Tuesday, December 2, 2014 at 2:06pm

Physics
A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
Tuesday, December 2, 2014 at 1:15pm

Physics
An ultrasound pulse from a boat is directed at the sea floor. Ultrasound travels at 1400 m/s. The pulse take 0.5 seconds to return to the boat. What is the depth of the sea in this area?
Tuesday, December 2, 2014 at 1:03pm

Physics
A cannon barrel is elevated at an angle of 45°. It fires a ball with a speed of 250 m/s. (For the following questions, ignore air resistance.) (a) What height does the ball reach? m (b) How long is the ball in the air? s (c) What is the horizontal range of the cannon? kmp
Tuesday, December 2, 2014 at 12:10pm

physics
A 500kg roller coaster starts from rest at points 35m above the ground level. The car drives down into a valley 4m above the ground and then climbs the top of a hill that is 24m above the ground level. What is the velocity of the car in the valley and at the top of the hill? (...
Tuesday, December 2, 2014 at 6:32am

physics
A 6 N box is projected with a velocity of 2 m/s at the bottom of the plane inclined 30 degrees above the horizontal. If friction is neglected, how high up along the plane will it travel before coming to rest?
Tuesday, December 2, 2014 at 6:25am

physics
If someone is standing on an edge of a table with a book in his hand.if he is going to fall from the este then What should he do to avoid falling from edge?
Tuesday, December 2, 2014 at 3:39am

Physics
We always hear people say “You should conserve energy! Think of what will happen to the next generation if all our energy resources get depleted!” Is this in contradiction with the Law of Conservation of Energy which states that the total amount of energy in the ...
Tuesday, December 2, 2014 at 2:32am

Physics
The figure below shows block 1 of mass 0.200 kg sliding to the right over a frictionless elevated surface at a speed of 5.00 m/s. The block undergoes an elastic collision with stationary block 2, which is attached to a spring of spring constant 1208.5 N/m. (Assume that the ...
Tuesday, December 2, 2014 at 1:19am

Physics
A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
Monday, December 1, 2014 at 10:52pm

physics
At t = 0 a block with mass M = 5 kg moves with a velocity v = 2 m/s at position xo = -.33 m from the equilibrium position of the spring. The block is attached to a massless spring of spring constant k = 61.2 N/m and slides on a frictionless surface. At what time will the block...
Monday, December 1, 2014 at 9:04pm

physics
You create a plot of T2 (in s2) vs mass (in kg) and the linear fit of your graph gives a slope of 0.12735 ± 0.01234. What is the value of the spring constant you took the data with? i am not sure what to do. i know the k=1/slope but im not sure how to start to solve ...
Monday, December 1, 2014 at 8:38pm

physics-finding velocity
A small block of mass .450 kg is sliding down a ramp inclined at an angle of 53 degrees to the horizontal. it starts to slide from a vertical height of .65 meters. Find the Velocity when it slides off the ramp. The way I approached this problem was by sing Vf^2-VI^2=2ad. ...
Monday, December 1, 2014 at 8:24pm

physics
Water flowing through a 1.9-cm-diameter pipe can fill a 500L bathtub in 5.1min. What is the speed of the water in the pipe?
Monday, December 1, 2014 at 7:41pm

Physics
An object is placed to the left of a lens, and a real image is formed to the right of the lens. The image is inverted relative to the object and is one-half the size of the object. The distance between the object and the image is 65 cm. (a) How far from the lens is the object...
Monday, December 1, 2014 at 7:32pm

Physics
A rectangular trough, 2.0 m long, 0.50 m wide, and 0.50 m deep, is completely full of water. One end of the trough has a small drain plug right at the bottom edge. When you pull the plug, at what speed does water emerge from the hole? (in m/s) Hint: V = sqrt (2 g H I just don...
Monday, December 1, 2014 at 7:23pm

physics
A spring scale is calibrated from zero to 20. N. The calibrations extend over a length of 0.10 m. (a) What is the elastic potential energy of the spring in the scale when a weight of 5.0 N hangs from it? (b) What is the elastic potential energy when the spring is fully stretched?
Monday, December 1, 2014 at 7:15pm

Physics
bob drop a rock from a height of 4.5 m. (the acceleration due to gravity is 9.8 m/s^2) 1.at s the initial speed of the rock 2. how long is the rock falling before it hits the ground c. what is the final speed of the rock? [I have trouble with c) My work: a) v1 =0m/s b) v1t +1/...
Monday, December 1, 2014 at 5:29pm

physics
2. You push a 2.0 Kg block against a horizontal spring (the spring constant is k=200 N/m) compressing it by 15 cm. Then you release the block and the spring sends it sliding across a tabletop. The block stops 75 cm from where you released it. (a) Find the work done by the ...
Monday, December 1, 2014 at 4:55pm

Physics
The windpipe of a whooping crane is about 1.27 m long. Assuming that the pipe is closed at one end, what is the fundamental frequency of this pipe? Answer in Hz and use 340 m/s for the speed of sound.
Monday, December 1, 2014 at 4:33pm

physics
A stretched string fixed at each end has a mass of 21 g and a length of 5.7 m. The tension in the string is 41.1 N. What is the vibration frequency for the third harmonic? Answer in Hz.
Monday, December 1, 2014 at 4:31pm

physics
An airplane traveling at v = 163 m/s emits a sound of frequency 1730 Hz. At what frequency does a stationary listener hear the sound as the plane approaches? Use 340 m/s for the speed of the sound and answer in Hz.
Monday, December 1, 2014 at 4:29pm

physics
You take a pendulum clock to the moon, Assuming you do not change anything about the clock, will it still keep the right time? why?
Monday, December 1, 2014 at 4:29pm

physics
You have a pendulum clock which keeps using a bob on a long shaft. The clock is running slow, You can add or subtract mass from the bobs, or move the bob up and down on the shaft? What should you do to correct the time on the clock?
Monday, December 1, 2014 at 4:28pm

physics
You test a moon buggy on earth. When the buggy hits a bump, it oscillates up and down on its springs with a period of 4 seconds. Will the period be the same when buggy is used on the moon?
Monday, December 1, 2014 at 4:28pm

Physics
Two sounds have measured intensities of I1 = 110 W/m2 and I2 = 330.00 W/m2. By how many decibels is the level of sound 1 lower than that of sound 2? Answer in dB.
Monday, December 1, 2014 at 4:27pm

physics
a 2.0-kg ball has a momentum of 25 kg*m/s. what is the ball's speed?
Monday, December 1, 2014 at 4:22pm

physics
Elephants communicate via infrasound, at frequencies as low as 11 Hz that can travel up to 9 km. The intensity of these sounds can reach 106 dB, measured a distance of 4 m from the source. a) Determine the intensity level in W/m2 of the infrasound at 4 m from the source. b) ...
Monday, December 1, 2014 at 3:57pm

Physics
An object is placed in front of a converging lens in such a position that the lens (f = 13.2 cm) produces a real image located 23.5 cm from the lens. Then, with the object remaining in place, the lens is replaced with another converging lens (f = 18.8 cm). A new, real image is...
Monday, December 1, 2014 at 3:50pm

Physics
A jet transport has a weight of 2.03 x 106 N and is at rest on the runway. The two rear wheels are 16.0 m behind the front wheel, and the plane's center of gravity is 12.1 m behind the front wheel. Determine the normal force exerted by the ground on (a) the front wheel and...
Monday, December 1, 2014 at 3:45pm

Physics
The wheels, axle, and handles of a wheelbarrow weigh W = 65 N. The load chamber and its contents weigh WL = 538 N. The drawing shows these two forces in two different wheelbarrow designs. To support the wheelbarrow in equilibrium, the man’s hands apply a force to the ...
Monday, December 1, 2014 at 3:40pm

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