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April 24, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
1. If the angle of the boat is 150 degrees, v' = 3 m/s, and v0 = 3.0 m/s, how far do you drift downstream before you arrive at the other side of the river? (HINT: read the x axis.) 2. If the river flow rate (v0) = 3.0 m/s, and the angle (è, or “theta”) is ...
Saturday, February 1, 2014 at 10:17pm

Physics
A test rocket is launched by accelerating it along a 200.0-m incline at 1.25m/s2 starting from rest at point A (the figure (Figure 1) .) The incline rises at 35.0 ∘ above the horizontal, and at the instant the rocket leaves it, its engines turn off and it is subject only...
Saturday, February 1, 2014 at 6:33pm

physics
A ball is thrown horizontally from a height of 24.93 m and hits the ground with a speed that is 3.0 times its initial speed. What was the initial speed?
Saturday, February 1, 2014 at 6:31pm

physics
A)Eddie the Eagle, British Olympic ski jumper, is attempting his most mediocre jump yet. After leaving the end of the ski ramp, he lands downhill at a point that is displaced 53.0 m horizontally from the edge of the ramp. His velocity just before landing is 26.0 m/s and points...
Saturday, February 1, 2014 at 6:31pm

physics
What is the ratio of the gravitational force on you when you are 5800 km above the Earth's surface versus when you are standing on the surface? (The Earth's radius is about 6400 km.)
Saturday, February 1, 2014 at 6:02pm

physics
A speedboat increases in speed from 21 m/s to 30.9 m/s in a distance 191 m. Find the magnitude of its acceleration.
Saturday, February 1, 2014 at 6:00pm

Physics
How would the force of gravity between two masses be affected if the separation distance between them were,assume F2 represents the new force and F1 represents the original force.(a)quadruple the original distance F2/F1= also one-half the original distance F2/F1
Saturday, February 1, 2014 at 5:54pm

College science
Im in Chem. but looks like physics.. If a rock climber accidentally drops a 70.5 g piton from a height of 295 meters, what would its speed be just before striking the ground? Ignore the effects of air resistance.
Saturday, February 1, 2014 at 4:34pm

Physics
A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage)
Saturday, February 1, 2014 at 4:25pm

physics..
What is the maximum height achieved if a 0.800 kg mass is thrown straight upward with an initial speed of 40.0 m·s–1? Ignore the effect of air resistance.
Saturday, February 1, 2014 at 4:17pm

physics
1.8 A jogger takes the following route to the entrance of their local park: north 45 m, west 60 m, south 75 m, and finally west 50 m. It takes them 7 minutes 26 seconds to reach the park entrance. (b) What is the average speed of the jogger?
Saturday, February 1, 2014 at 4:11pm

physics
A jogger takes the following route to the entrance of their local park: north 50 m, west 50 m, south 85 m, and finally west 70 m. It takes them 9 minutes 40 seconds to reach the park entrance. (a) What distance did the jogger travel
Saturday, February 1, 2014 at 4:10pm

physics
A projectile is launched from ground level at 37.0 m/s at an angle of 30.6 ° above horizontal. Use the launch point as the origin of your coordinate system. (a) How much time elapses before the projectile is at a point 8.9 m above the ground and heading downwards toward ...
Saturday, February 1, 2014 at 2:13pm

physics
A ball is thrown horizontally from a height of 24.93 m and hits the ground with a speed that is 3.0 times its initial speed. What was the initial speed?
Saturday, February 1, 2014 at 12:29pm

physics Work unit
1. A football player pushes a tackle dummy forwards at a constant 0.85m/s for 11m using 7150J of energy. The tackling dummy mass is 120kg. a) find force the player exerts? b) what is the frictional force the dummy exerts? c) what work is done by the friction as the dummy is ...
Saturday, February 1, 2014 at 11:49am

physics
Stones are thrown horizontally, with the same initial velocity, from the tops of two different buildings, A and B. The stone from building A lands 4 times as far from the base of the building as does the stone from building B. What is the ratio of building A's height to ...
Saturday, February 1, 2014 at 11:45am

physics
A)Eddie the Eagle, British Olympic ski jumper, is attempting his most mediocre jump yet. After leaving the end of the ski ramp, he lands downhill at a point that is displaced 53.0 m horizontally from the edge of the ramp. His velocity just before landing is 26.0 m/s and points...
Saturday, February 1, 2014 at 11:44am

physics
A)You are in a hot air balloon rising from the ground at a constant velocity of 2.50 m/s upward. To celebrate the takeoff, you open a bottle of champagne, expelling the cork with a horizontal velocity of 5.70 m/s relative to the balloon. When opened, the bottle is 6.40 m above...
Saturday, February 1, 2014 at 11:43am

Physics
A swimmer wants to cross a river, from point A to point B, as shown in the figure. The distance d1 (from A to C) is 200 m, the distance d2 (from C to B) is 132 m, and the speed of the current in the river is 1.0 m/s. Suppose that the swimmer's velocity relative to the ...
Saturday, February 1, 2014 at 12:30am

Physics Work unit
1. A football player pushes a tackle dummy forwards at a constant 0.85m/s for 11m using 7150J of energy. The tackling dummy mass is 120kg. a) find force the player exerts? b) what is the frictional force the dummy exerts? c) what work is done by the friction as the dummy is ...
Saturday, February 1, 2014 at 12:21am

physics
Ok, let's use the following information to very roughly estimate the size of the nucleus. Rutherford, Geiger, and Marsden (his students) fired a beam of alpha particles at a gold foil. The alpha particles had an energy of about 3.70 million electron volts, a charge of +2e...
Friday, January 31, 2014 at 11:53pm

Physics
For non-ideal oscillators (such as a real pendulum) energy is lost and the amplitude (which is the maximum displacement) is no longer constant but also decreases with time. How fast the energy lost is described by a TIME CONSTANT, τ = m/b. Typically after ONE time ...
Friday, January 31, 2014 at 11:19pm

physics
Ok, let's use the following information to very roughly estimate the size of the nucleus. Rutherford, Geiger, and Marsden (his students) fired a beam of alpha particles at a gold foil. The alpha particles had an energy of about 3.70 million electron volts, a charge of +2e...
Friday, January 31, 2014 at 11:15pm

physics
Stones are thrown horizontally, with the same initial velocity, from the tops of two different buildings, A and B. The stone from building A lands 4 times as far from the base of the building as does the stone from building B. What is the ratio of building A's height to ...
Friday, January 31, 2014 at 11:02pm

physics
A)You are in a hot air balloon (yes, another balloon problem!) rising from the ground at a constant velocity of 2.50 m/s upward. To celebrate the takeoff, you open a bottle of champagne, expelling the cork with a horizontal velocity of 5.70 m/s relative to the balloon. When ...
Friday, January 31, 2014 at 10:33pm

physics
A)Eddie the Eagle, British Olympic ski jumper, is attempting his most mediocre jump yet. After leaving the end of the ski ramp, he lands downhill at a point that is displaced 53.0 m horizontally from the edge of the ramp. His velocity just before landing is 26.0 m/s and points...
Friday, January 31, 2014 at 10:23pm

physics
A projectile is launched from ground level at 37.0 m/s at an angle of 30.6 ° above horizontal. Use the launch point as the origin of your coordinate system. a)How much time elapses before the projectile is at a point 8.9 m above the ground and heading downwards toward the ...
Friday, January 31, 2014 at 10:19pm

Physics
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 22 m/s at an angle 63 degrees; with respect to the horizontal. Sarah catches the ball 1.5 meters above the ground.
Friday, January 31, 2014 at 6:20pm

physics
A diver runs horizontally with a speed of 1.30 m/s off a platform that is 8.6 m above the water. What is his speed just before striking the water?
Friday, January 31, 2014 at 6:12pm

Physics
A weight lifter manages to lift a 147 kg weight a distance of 1.1 m. Treat her as a thermodynamic system and find how much heat (in kcal) she must put out if her internal energy decreases by 3620 J during the lift.
Friday, January 31, 2014 at 5:59pm

Physics
If a 65 kilogram load was raised 6 meters in 60 seconds determine the minimum rated wattage of the motor needed to accomplish this assuming the motor is 75% efficient. give your answer in W.
Friday, January 31, 2014 at 4:15pm

Physics
an object in completely submerged in a liquid of density .65 grams per cubic centimeter at a depth of 4 meters what is the total pressure on the object. State your answer in atmospheres. I only get 3 tries and both my other attempts failed. Ill lose credit now please help!
Friday, January 31, 2014 at 4:13pm

physics
a 95-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is: (A) accelerating upward with an acceleration of 1.8 m/s^2 (answer 1.1 * 10^3 N) (B) moving upward at a constant speed (answer 931 N) (C) accelerating downward with an ...
Friday, January 31, 2014 at 3:17pm

physics
a 15-g bullet is fired from a rifle. it takes 2.50 * 10^-3s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 715 m/s. assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet. (answer ...
Friday, January 31, 2014 at 3:14pm

physics
a boat has a mass of 6800 kg. its engine generate a drive force of 4100 N, due west, while the wind exerts a force of 8000 N, due east, and the water exerts a resistive force of 1200 N due east. what is the magnitude and direction of the boats accelerations? (answer 0.309 m/s^...
Friday, January 31, 2014 at 3:12pm

physics
the total electric field e consists of the vector sum of two parts. one part has a magnitude of e1 = 1284 n/c and points at an angle θ1 = 30° above the +x axis. the other part has a magnitude of e2 = 1833 n/c and points at an angle θ2 = 62° above the +x axis...
Friday, January 31, 2014 at 2:32pm

Physics
A hailstone traveling with a velocity of 43 meters/second comes to a virtual stop 0.28 seconds after hitting water. What is the magnitude of its acceleration in the water?
Friday, January 31, 2014 at 12:51pm

physics
Suppose you went to the beach and you shoot a laser beam over the ocean, perfectly horizontal. The beam starts at sea-level, exactly. How far above the ocean surface will the laser beam be at a distance of 8 km?
Friday, January 31, 2014 at 12:37pm

Physics
A weight lifter manages to lift a 147 kg weight a distance of 1.1 m. Treat her as a thermodynamic system and find how much heat (in kcal) she must put out if her internal energy decreases by 3620 J during the lift. Not sure how to answer this.
Friday, January 31, 2014 at 11:08am

Physics
An ideal gas heat engine operates in a Carnot Cycle between temperatures of 266 and 115°C. It absorbs 4250 cal per cycle at 266°C. What is its efficiency as a percentage
Friday, January 31, 2014 at 11:05am

Physics
A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage)
Friday, January 31, 2014 at 11:05am

Physics
How much (in Celsius degrees) is the temperature of 1.3 kg of alcohol raised by adding 4.1 kcal of heat? The following piece of information may come in handy: specific heat of alcohol is 0.58 kcal/kgC.
Friday, January 31, 2014 at 11:00am

Physics
An aluminum calorimetry cup [mc = 0.6 kg, cc = 0.22 kcal/(kgC)] is filled with water [mw = 2.4 kg, cw = 1 kcal/(kgC)]. It is at a temperature of 30C. A sample of an unknown substance with mass mm = 2.34 kg, originally at a temperature of 210C, is added. After a while, the ...
Friday, January 31, 2014 at 10:56am

physics
A superball is dropped from rest from a height of 2.0m. It bounces repeatedly from the floor, as superballs are prone to do. After each bounce the ball dissipates some energy, so eventually it comes to rest. The following pattern is observed: After the 1st bounce, the ball ...
Friday, January 31, 2014 at 9:46am

physics
A man steps off a 100 m diving platform. How long will it take him to drop the …first 50 m? How long will it take him to drop the second 50 m?
Friday, January 31, 2014 at 1:12am

physics
When a bullet leaves a barrel of a rifle, it is moving 640 m/s. If the barrel is 1.20 m long, and if the bullet undergoes constant acceleration while within the barrel, how long after the rifle is fired will the bullet emerge from the end of the barrel?
Friday, January 31, 2014 at 1:10am

physics
As soon as the stop light changes from red to green, a car at rest at the intersection accelerates with a constant acceleration of 2.2 m/s/s. At the same moment, a truck passes by, moving at a constant speed of 9.5 m/s. How far beyond the intersection will the car catch the ...
Friday, January 31, 2014 at 1:08am

physics
A superball is dropped from rest from a height of 2.0m. It bounces repeatedly from the floor, as superballs are prone to do. After each bounce the ball dissipates some energy, so eventually it comes to rest. The following pattern is observed: After the 1st bounce, the ball ...
Friday, January 31, 2014 at 12:56am

physics
A snowmobile moves according to the velocity-time graph shown in the drawing. What is the snowmobile's average acceleration during each of the segments A, B, and C? The scale for the time axis is 30 s per increment, and the scale for the velocity axis is 50 m/s per increment.
Friday, January 31, 2014 at 12:33am

Physics
The Nova laser at Lawrence Livermore National Laboratory in California is used in studies of initiating controlled nuclear fusion (Section 45.4). It can deliver a power of 1.60 × 1013 W over a time interval of 2.50 ns. Compare its energy output in one such time interval ...
Friday, January 31, 2014 at 12:03am

Physics
The Nova laser at Lawrence Livermore National Laboratory in California is used in studies of initiating controlled nuclear fusion (Section 45.4). It can deliver a power of 1.60 × 1013 W over a time interval of 2.50 ns. Compare its energy output in one such time interval ...
Friday, January 31, 2014 at 12:03am

Physics
A water heater is operated by solar power. If solar collector has an area of 6.00m^2, and the intensity delivered by sunlight is 550W/m^2, how long does it take to increase the temperature of 1m^3 of water from 20°Cto 60°C?
Thursday, January 30, 2014 at 11:53pm

Physics
How much momentum does a .01 kg ping pong ball have if it is traveling at 25 miles/hour? (1.609km=1 mile)
Thursday, January 30, 2014 at 10:33pm

Physics
How much momentum does a .01 kg ping pong ball have if it is traveling at 25 miles/hour? (1.609km=1 mile)
Thursday, January 30, 2014 at 10:32pm

physics
A frog in a hemispherical bowl, as shown below, just floats in a fluid with a density of 1.29 ✕ 103 kg/m3. If the bowl has a radius of 5.30 cm and negligible mass, what is the mass of the frog?
Thursday, January 30, 2014 at 10:26pm

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
Thursday, January 30, 2014 at 9:50pm

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
Thursday, January 30, 2014 at 9:45pm

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
Thursday, January 30, 2014 at 9:38pm

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
Thursday, January 30, 2014 at 9:37pm

Physics
Two speeding lead bullets each of mass 5 g and temperature of 20°C collide head on at speeds of 500m/s each. Assuming a perfectly inelastic collision and no loss of energy to the atmospheres, describe the final state of the two bullet system.
Thursday, January 30, 2014 at 8:41pm

Physics
A bar of gold is in thermal contact with a bar of silver of the same length and area. One end of the compound bar is maintained at 80.0°C while the opposite end is at 30.0°C. When the energy transfer reaches steady state, what is the temperature at the junction?
Thursday, January 30, 2014 at 8:40pm

physics
A glass window pane has an area of 3.00 m2 and a thickness of 0.600 cm. If the temperature difference between its faces is 25.0°C, what is the rate of energy transfer by conduction through the window.
Thursday, January 30, 2014 at 8:40pm

Physics
A small 9g plastic ball is suspended by a 35 cm long string in a uniform electric field 1110 N/C as shown. The ball is in equilibrium when the string makes a 23 degree angle with the vertical.
Thursday, January 30, 2014 at 8:01pm

Physics
On a curved roadway of radius 100 m, the suggested speed limit is 35 mph (approximately 16 m/s). What must the coefficient of friction be between a car’s tires and the road for the car to safely negotiate the curve at the posted speed?
Thursday, January 30, 2014 at 7:47pm

Physics 141
A snowmobile moves according to the velocity-time graph shown in the drawing. What is the snowmobile's average acceleration during each of the segments A, B, and C? The scale for the time axis is 100 s per increment, and the scale for the velocity axis is 110 m/s per ...
Thursday, January 30, 2014 at 5:35pm

physics
A)A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.15 m/s at an angle of 19.0o below the horizontal. It strikes the ground 2.50 s later. How far horizontally from the base of the building does the ball strike the ground? B)...
Thursday, January 30, 2014 at 4:21pm

physics
Two point charges lie on the x axis. A charge of 6.2μC is at the origin, and a charge of -9.5μC is at x=10.0cm. What is the net electric field at (a) x=−4.0cm and at (b) x=+4.0cm?
Thursday, January 30, 2014 at 3:07pm

Physics
On an unknown planet, a pendulum of length 1.5 m swings with a period of 3.3 s. What is the acceleration of gravity on this planet?
Thursday, January 30, 2014 at 2:59pm

Physics
A ball player catches a ball 3.33s after throwing it vertically upward. a) with what speed did he throw it? b) what height did it reach?
Thursday, January 30, 2014 at 2:26pm

physics
A spring (k=80n/m) lies on a frictionless table, one end connected to the wall, the other to a 4kg block. The block is pulled, stretching the spring .5m. and then released. A) max elastic potential energy of system? b) total energy? C) what is the acceleration of the block at ...
Thursday, January 30, 2014 at 1:56pm

Physics
An object is dropped from a platform100 ft high. Ignoring wind resistance, how long will it take to reach the ground?
Thursday, January 30, 2014 at 1:05pm

physics
If the ball is in equilibrium when the string makes a 43◦ angle with the vertical as indicated, what is the net charge on the ball? The acceleration due to gravity is 9.81 m/s 2. Answer in units of C
Thursday, January 30, 2014 at 12:04pm

Physics
Grains of fine California beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.4 × 10^3 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual ...
Thursday, January 30, 2014 at 11:14am

Physics
A severe thunderstorm dumped 2.4 in of rain in 30 min on a town of area 35 km^2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.
Thursday, January 30, 2014 at 11:12am

physics
A flywheel has a small magnet mounted on it. EAch time the magnet passes the coil, a voltage pulse is generated, which is passed to the c.r.o. The display of the c.r.o. is 10cm wide. The flywheel is rotating at a rate of about 3000 revolutions per minute.Why will the time base...
Thursday, January 30, 2014 at 7:01am

Physics
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
Thursday, January 30, 2014 at 2:48am

physics
This question is roughly based on some historical data from tropical cyclone Clare which crossed the WA coast near Dampier in January 2006. It started off as a tropical low north of the Northern Territory and was upgraded to tropical cyclone intensity at 8 pm on Saturday 7 ...
Thursday, January 30, 2014 at 1:27am

physics
A car is stopped at a set of traffic lights. It takes off, accelerating at 4.5m/s2 until it is travelling at 60km/h. It maintains this velocity for 3 minutes before braking to a halt over 60m at another set of traffic lights. How far has the car travelled in this trip and how ...
Thursday, January 30, 2014 at 1:26am

physics
A basket weighing 0.3kg is suspended from two ropes which are tied to a horizontal beam. The rope on the left is at an angle of 63° and the rope on the right is at an angle of 32° with respect to the beam. What mass of rocks could be placed in the bucket before the ...
Thursday, January 30, 2014 at 1:26am

physics
On a day with a breeze blowing from the west at 8.5km/h, a remote control helicopter, facing north, takes off vertically from a level field at full power. It has a mass of 700g and the propeller generates 10N of thrust when running at full power. Once it reaches a height of 5m...
Thursday, January 30, 2014 at 1:25am

physics
Wavelength in a Closed Column Here is the prompt: We place a speaker near the top of a drinking glass. The speaker emits sound waves with a frequency of 3.75 kHz. The glass is 14.1 cm deep. As I pour water into the glass, I find that at certain levels the sound is enhanced due...
Thursday, January 30, 2014 at 12:24am

Physics 112
Moving a charge from point A, where the potential is 370V , to point B, where the potential is 190V , takes 4.1×10−4J of work. Part A What is the value of the charge?
Thursday, January 30, 2014 at 12:13am

physics
Four charges −8 × 10^−9 C at (0 m, 0 m), −7 × 10^−9 C at (5 m, 1 m), −1 × 10^−9 C at (−2 m, −3 m), and 2 × 10^−9 C at (−2 m, 4 m), are arranged in the (x, y) plane as shown. Find the magnitude ...
Wednesday, January 29, 2014 at 11:26pm

Physics
Problem 1 (80 points) Consider a spring of equilibrium length L, lying horizontally in a frictionless trough. The spring has cross sectional area S perpendicular to its length. The trough constrains the motion of the spring so that any wave propagating along the spring is a ...
Wednesday, January 29, 2014 at 11:24pm

physics
A motorcycle stunt driver zooms off the end of a cliff at a speed of 30 meters per second. If he lands after 0.75 seconds, what is the height of the cliff?
Wednesday, January 29, 2014 at 11:16pm

physics
A river flows due east at 1.65 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.7 m/s due north relative to the water. What is the velocity of the boat relative to shore?
Wednesday, January 29, 2014 at 9:50pm

Physics Speed of Sound
Does sound travel faster in wood or water?
Wednesday, January 29, 2014 at 8:47pm

physics
A small block is released from rest at the top of a frictionless incline. The distance from the top of the incline to the bottom, measured along the incline, is 3.60 m. The vertical distance from the top of the incline to the bottom is 1.36 m. If g = 9.80 m/s2, what is the ...
Wednesday, January 29, 2014 at 4:11pm

Physics
Problem 1 (80 points) Consider a spring of equilibrium length L, lying horizontally in a frictionless trough. The spring has cross sectional area S perpendicular to its length. The trough constrains the motion of the spring so that any wave propagating along the spring is a ...
Wednesday, January 29, 2014 at 3:50pm

physics
A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. What is the acceleration of the crate?
Wednesday, January 29, 2014 at 3:25pm

Physics
Snells law lab
Wednesday, January 29, 2014 at 2:53pm

physics
A 3.90 kg block is in equilibrium on an incline of 27.5◦ . The acceleration of gravity is 9.81 m/s 2 . What is Fn of the incline on the block? Answer in units of N
Wednesday, January 29, 2014 at 2:52pm

physics
What neutralizes acid rain?
Wednesday, January 29, 2014 at 1:51pm

Physics
Please help! 400 calories of heat are added to 40grams of water at 20celcius . What's the final temp reached ?
Wednesday, January 29, 2014 at 12:51pm

Physics
A car experiences a constant acceleration of 2.3 m/s2. How long does it take (in s) for the car's speed to increase from 6.6 m/s to 17.9 m/s?
Wednesday, January 29, 2014 at 11:59am

physics
What neutralizes acid rain?
Wednesday, January 29, 2014 at 8:46am

physics
A wave travels a distance of 20m in 3s. The distance btw successive crests of the wave is 4cm. What is the frequency of the wave?
Wednesday, January 29, 2014 at 8:21am

physics
A toy rocket is launched at an initial velocity of 50 m/s at an angle of 75° with the horizontal. Write parametric equations to represent the path of the rocket. (A)x = 50t cos 75°y = 50t sin 75° – 4.9t2 (B)x = 50t cos 75°y = 50t sin 75° – 16t2
Wednesday, January 29, 2014 at 12:43am

Physics
Calculate the percentage of Earth’s gravitational force on the ISS astronauts while orbiting at an altitude of 248 miles above Earth’s surface. To do this, compare the gravitational force on an orbiting astronaut to the force on the astronaut here at Earth’s ...
Tuesday, January 28, 2014 at 11:18pm

PHYSICS
Suppose that the electric potential outside a living cell is higher than that inside the cell by 0.0928 V. How much work is done by the electric force when a sodium ion (charge = +e) moves from the outside to the inside? no idea how to do this can i just have the step by step ...
Tuesday, January 28, 2014 at 11:02pm

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