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April 25, 2014

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Recent Homework Questions About Physics

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Physics
Two objects are connected by a light string that passes over a frictionless pulley. The incline is frictionless, m1 = 2.00 kg, m2 = 4.00 kg, and theta= 60.0°. (b) Find the accelerations of the objects. Magnitude (c) Find the tension in the string. N (d) Find the speed of ...
Wednesday, September 19, 2012 at 5:20pm

physics
When baseball players throw the ball in from the outfield, they sometimes allow it to take one bounce before it reaches the infield on the theory that the ball arrives sooner that way. Suppose the angle at which a bounced ball leaves the ground is the same as the angle at ...
Wednesday, September 19, 2012 at 5:10pm

physics
A rowboat crosses a river with a velocity of 4.23 mi/h at an angle 62.5o north of west relative to the water. The river is 0.543 mi wide and carries an eastward current of 0.73 mi/h. How far upstream is the boat when it reaches the opposite shore?
Wednesday, September 19, 2012 at 4:25pm

physics
A man walks 3 miles east in 1 hour at a constant velocity, then walks 2 miles east at a constant velocity in 20 minutes, then 2 miles east at a constant velocity in 40 minutes, then rests for 1 hour and then turns around and walks 8 miles west in two hours.What is the distance...
Wednesday, September 19, 2012 at 4:13pm

Physics
Find the magnitude of the acceleration (in m/s2) for an electron in a uniform electric field with a magnitude of 100 N/C. and Find the time it takes (in sec) for an electron initially at rest in a uniform electric field of 110 N/C to reach a speed of 0.01c (where c is the ...
Wednesday, September 19, 2012 at 4:11pm

physics
Secret agent Samantha Bond, 43.00 kg, has just ignited her jet powered skis at the foot of a 10.0 degree slope that rises in height by 50.0 m. The skis have a thrust of 226.0 N. When she gets to the top of the slope, she keeps the skis at 10.0 degrees as she flies through the ...
Wednesday, September 19, 2012 at 4:06pm

Physics
Find the magnitude of the acceleration (in m/s2) for an electron in a uniform electric field with a magnitude of 100 N/C. and Find the time it takes (in sec) for an electron initially at rest in a uniform electric field of 110 N/C to reach a speed of 0.01c (where c is the ...
Wednesday, September 19, 2012 at 4:02pm

Physics
A ball is thrown vertically upward and comes back down. Total time of 7.95 s in air. What is its initial velocity? Neglect air resistance.
Wednesday, September 19, 2012 at 2:54pm

Physics
A stone is thrown vertically upward from outside a window, with an initial velocity of 24.0 m/s. It moves up, and then down to the ground 420 m below the point where it started. Let `up' be positive. (a) What is the maximum height above the window to which the stone rises...
Wednesday, September 19, 2012 at 2:44pm

Physics
A car traveling 56 km/h is 22.0 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.15 s later. (a) Assuming constant acceleration, what was the magnitude of the car's acceleration before impact? _______ m/s2 (b) How fast was the car traveling ...
Wednesday, September 19, 2012 at 2:43pm

physics
a) a car does an emergency stop from 120000m/s in 3s. what was it's deceleration? b) what was the car's average velocity and what was the stopping distance? thank you
Wednesday, September 19, 2012 at 2:12pm

physics-batteries
how does the current through the flashlight using good batteries compare to the current using bad batteries?
Wednesday, September 19, 2012 at 2:02pm

physics
if a juggernaut decelerates at 9m/s^2, how long will it take him to stop from 45m/s?
Wednesday, September 19, 2012 at 1:51pm

Physics
A beam of X-rays with a wavelength Ć of 0.179nm is directed at an iron crystal whose planes have a spacing of 0.1013nm. How many diffraction peaks (each arising from a different order n) are possible? I'm really not sure how to go about solving this. Any help is...
Wednesday, September 19, 2012 at 1:16pm

physics
A 52kg teen grabs onto a rope swing. The length of rope between the teen and the pivot point above is 4.5m, and the rope makes an angle of 40o relative to vertical. Calculate his change in potential energy as he swings down and out to the point where the rope is in the ...
Wednesday, September 19, 2012 at 1:01pm

physics
At a certain instant a moving object comes to momentary rest. Is it accelerating at that moment?
Wednesday, September 19, 2012 at 12:44pm

physics
A Nordic jumper goes off a ski jump at an angle of 10.0° below the horizontal, traveling 92.0 m horizontally and 47.0 m vertically before landing.; (a) Ignoring friction and aerodynamic effects, calculate the speed needed by the skier on leaving the ramp
Wednesday, September 19, 2012 at 11:19am

physics
what is the electric charge force between two chaged particles (q1=+5C and q2=+6C) if the chardes are 2 meters apart?
Wednesday, September 19, 2012 at 11:15am

physics
How much work does gravity do on a 0.120-kg ball falling from a height of 17.0 m?
Wednesday, September 19, 2012 at 10:43am

physics
find the value of 60jule per minute on a system which has 10cm, 100gm and 1minute as fundamental unit
Wednesday, September 19, 2012 at 10:22am

physics
If an 8N force is applied to a wall for 2 minutes and the wall does not move, how much work is done?
Wednesday, September 19, 2012 at 10:17am

Physics
A car goes around a curve on a road that is banked at an angle of 33.5 degrees. Even though the road is slick, the car will stay on the road without any friction between its tires and the road when its speed is 22.7 m/s. What is the radius of the curve?
Wednesday, September 19, 2012 at 10:14am

Physics
Bob jumps from a 2.0 m high table and wants to jump over a 0.85 m radius ball. How fast must Bob move horizontally to not land on the ball? If we use kinematics equations for projectile, the answer is 2.66 m/s; however, with this velocity the person will land on the ball. I ...
Wednesday, September 19, 2012 at 8:51am

college-physics
how to write scientific report on physics
Wednesday, September 19, 2012 at 2:19am

physics
A fire hose ejects a stream of water at an angle of 31.5 ° above the horizontal. The water leaves the nozzle with a speed of 24.3 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
Wednesday, September 19, 2012 at 1:21am

Physics
During practice, a soccer player kicks a ball, giving it a 32.5 m/s initial speed. It travels the maximum possible distance before landing down field. (a) How much time does the ball spend in the air? (b) How far did the ball travel?
Wednesday, September 19, 2012 at 12:08am

Physics
You throw a ball downward from a window at a speed of 2.7 m/s. How fast will it be moving when it hits the sidewalk 2.9 m below?
Tuesday, September 18, 2012 at 11:46pm

physics
A projectile is launched at an angle of 36.2 degrees above the horizontal with an initial speed of 33.0 m/s. what is the horizontal component of its velocity?
Tuesday, September 18, 2012 at 11:20pm

physics
A projectile is launched at an angle of 58.5 degrees above the horizontal and lands at the same level from which it was launched 3.88 seconds later. what is the magnitude of the initial velocity?
Tuesday, September 18, 2012 at 11:20pm

Physics
A hot-air balloon is rising straight up with a speed of 5.4 m/s. A ballast bag is released from rest relative to the balloon when it is 11.2 m above the ground. How much time elapses before the ballast bag hits the ground?
Tuesday, September 18, 2012 at 11:16pm

Physics
A fire hose ejects a stream of water at an angle of 29.0° above the horizontal. The water leaves the nozzle with a speed of 31.0 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
Tuesday, September 18, 2012 at 11:06pm

physics
A swimmer, capable of swimming at a speed of 1.3 m/s in still water (i.e., the swimmer can swim with a speed of 1.3 m/s relative to the water), starts to swim directly across a 2.2-km-wide river. However, the current is 0.91 m/s, and it carries the swimmer downstream. (a) How ...
Tuesday, September 18, 2012 at 10:58pm

Physics 1
A bullet is fired from a rifle that is held 2.0 m above the ground in a horizontal position. The initial speed of the bullet is 1250 m/s. (a) Find the time it takes for the bullet to strike the ground. 1 s (b) Find the horizontal distance traveled by the bullet. 2 m
Tuesday, September 18, 2012 at 10:56pm

physics
On a pleasure cruise a boat is traveling relative to the water at a speed of 4.8 m/s due south. Relative to the boat, a passenger walks toward the back of the boat at a speed of 1.3 m/s. (a) What is the magnitude and direction of the passenger's velocity relative to the ...
Tuesday, September 18, 2012 at 10:56pm

Physics
A car drives straight off the edge of a cliff that is 60 m high. The police at the scene of the accident observed that the point of impact is 126 m from the base of the cliff. How fast was the car traveling when it went over the cliff?
Tuesday, September 18, 2012 at 10:51pm

physics
A shell is fired from the ground with an initial speed of 1.70 × 10 3 m/s (approximately five times the speed of sound) at an initial angle of 70.0 ◦ to the horizontal. The acceleration of gravity is 9.81 m/s 2 . a) Neglecting air resistance, find...
Tuesday, September 18, 2012 at 10:45pm

Physics
The 1994 Winter Olympics included the aerials competition in skiing. In this event skiers speed down a ramp that slopes sharply upward at the end. The sharp upward slope launches them into the air, where they perform acrobatic maneuvers. In the women's competition, the end...
Tuesday, September 18, 2012 at 10:40pm

physics
A 3 kg toy car with a speed of 10 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 2 m/s. If the cars are locked together after the collision with a speed of 5.20 m/s, how much kinetic energy is lost?
Tuesday, September 18, 2012 at 10:30pm

physics
A pelican flying along a horizontal path drops a fish from a height of 3.1 m. The fish travels 6.4 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
Tuesday, September 18, 2012 at 10:30pm

physics
A 3 kg toy car with a speed of 10 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 2 m/s. If the cars are locked together after the collision with a speed of 5.20 m/s, how much kinetic energy is lost?
Tuesday, September 18, 2012 at 10:17pm

Physics
A volleyball is spiked so that it has an initial velocity of 14 m/s directed downward at an angle of 58° below the horizontal. What is the horizontal component of the ball's velocity when the opposing player fields the ball?
Tuesday, September 18, 2012 at 10:17pm

physics
A 3 kg toy car with a speed of 10 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 2 m/s. If the cars are locked together after the collision with a speed of 5.20 m/s, how much kinetic energy is lost?
Tuesday, September 18, 2012 at 10:12pm

Physics
A child is pushing a shopping cart at a speed of 1.5 m/s. How long will it take this child to push the cart down an aisle with a length of 9.3 m?
Tuesday, September 18, 2012 at 10:05pm

physics
A car is coasting backwards downhill at a speed of 2.6 m/s when the driver gets the engine started. After 2.5 s, the car is moving uphill at 4.6 m/s. Assuming that the uphill is the positive direction, what is the car's average acceleration?
Tuesday, September 18, 2012 at 10:04pm

Physics
In the absence of air resistance, a projectile is launched from and returns to ground level. It follows a trajectory similar to that in the figure below and has a range of 15 m. Suppose the launch speed is doubled, and the projectile is fired at the same angle above the ground...
Tuesday, September 18, 2012 at 9:57pm

Physics 1
A major-league pitcher can throw a baseball in excess of 40.6 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 19.8 m away from the point of release?
Tuesday, September 18, 2012 at 9:50pm

physics
A projectile is launched at an angle of 54.6 degrees above the horizontal with an initial speed of 225 m/s and lands at the same level from which it was launched. The range is 205 meters. The time of flight is how many seconds?
Tuesday, September 18, 2012 at 9:46pm

Physics
On a distant planet, golf is just as popular as it is on earth. A golfer tees off and drives the ball 4.1 times as far as he would have on earth, given the same initial velocities on both planets. The ball is launched at a speed of 50 m/s at an angle of 32° above the ...
Tuesday, September 18, 2012 at 9:43pm

Physics
A pelican flying along a horizontal path drops a fish from a height of 4.2 m. The fish travels 9.1 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s2.
Tuesday, September 18, 2012 at 9:41pm

Physics
On a spacecraft two engines fire for a time of 555 s. One gives the craft an acceleration in the x direction of ax = 5.10 m/s2, while the other produces an acceleration in the y direction of ay = 7.30 m/s2. At the end of the firing period, the craft has velocity components of ...
Tuesday, September 18, 2012 at 9:39pm

physics
A motor car moving at a speed of 72 km/h can not come to a stop in less than 3 s while for a truck this time interval is 5.0s . On a highway the car is behind the truck both moving at 72 km/h . The truck gives a signal that it is going to stop at emergency. At what distance ...
Tuesday, September 18, 2012 at 9:36pm

Physics 1
A bird watcher meanders through the woods, walking 0.45 km due east, 0.80 km due south, and 2.05 km in a direction 43.0° north of west. The time required for this trip is 2.50 h. (a) Determine the magnitude and direction (relative to due west) of the bird watcher's ...
Tuesday, September 18, 2012 at 9:23pm

Physics 1
A mountain-climbing expedition establishes two intermediate camps, labeled A and B in the drawing, above the base camp. (x1 = 10500 m, and x2 = 17500 m.) What is the magnitude Är of the displacement between camp A and camp B?
Tuesday, September 18, 2012 at 9:19pm

physics
a curve of radius 50 m is to be banked, so that the automobile may make a turn at a speed of 15 m/s without depending on friction. at what angle should the road be banked?
Tuesday, September 18, 2012 at 9:12pm

physics
Find x- and y-components of the vector \vec {v}=(2.0cm/s , - x-direction).
Tuesday, September 18, 2012 at 9:11pm

Physics/Chemistry
I am not producing the correct answer which is 2.06 psia. Question: The pressure gauge on the steam condenser for a turbine indicates 26.2 in. Hg of vacuum. The barometer reading is 30.4 in. Hg. What is the absolute pressure in the condenser in psia? I know that 1 in. Hg = 0....
Tuesday, September 18, 2012 at 9:10pm

Physics
A meteoroid is speeding through the atmosphere, traveling east at 14.8 km/s while descending at a rate of 12.5 km/s. What is its speed, in km/s?
Tuesday, September 18, 2012 at 9:07pm

physics
what is the maximum speed at which automobile can round a curve of 100 ft radius on level if the coefficient of friction between the tires and the road is 0.35?
Tuesday, September 18, 2012 at 9:06pm

Physics
A canoeist is trying to paddle upstream in a river that has a velocity of 6.1 m/s. a) If he can paddle his canoe at a velocity of 6.2 m/s will he make any headway? b)What will be his velocity relative to the shore?
Tuesday, September 18, 2012 at 9:02pm

physics
A 970-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 25.0 m/s. What is the average force exerted on the car during this time
Tuesday, September 18, 2012 at 8:56pm

physics
A train is moving parallel and adjacent to a highway with a constant speed of 25 m/s. Initially a car is 49 meters behind the train travelling in the same directionas the train at 37 m/s and accelerating at 4 m/s^2. What is the speed of the car just as it passes the train.
Tuesday, September 18, 2012 at 8:48pm

physics
A nurse pushes a cart by exerting a force on the handle at a downward angle 35.0º below the horizontal. The loaded cart has a mass of 28.0 kg, and the force of friction is 60.0 N. (a) Draw a free-body diagram for the system of interest. (b) What force must the nurse exert...
Tuesday, September 18, 2012 at 8:38pm

Physics
Trying to be on time for class, a girl moves at 2.4 m/s down a 52 m-long hallway, 1.2 m/s down a much more crowded hallway that is 79 m long, and the last 25 m to her class at 3.4 m/s. How long does it take her to reach her class?
Tuesday, September 18, 2012 at 8:31pm

Physics
A missile is fired and travels at 309 m/s. If the operator discovers that the missile is locked on the wrong target and must be detonated by remote signal before impact, how far will the missile travel if the operator's reaction time to send the signal is 1.21 s?
Tuesday, September 18, 2012 at 8:10pm

physics
A bus slows down uniformly from 68.4 km/h to 0 km/h in 23.7 s. How far does it travel before stopping?
Tuesday, September 18, 2012 at 7:37pm

physics
A golf ball is hit with an initial velocity of 50 m/s at an angle of 39 degrees above the horizontal. How far does it travel?(horizontal distance)(g = 9.8 m/s2). I made a right triangle. Found that Vi(x)=38.857, Vi(y)=312.466, both Vf's were 0, although Vf(y) is taking ...
Tuesday, September 18, 2012 at 7:24pm

physics
A bullet is fired from a rifle that is held 4.6 m above the ground in a horizontal position. The initial speed of the bullet is 1130 m/s. There is no error in the velocity value. (a) Find the time it takes for the bullet to strike the ground. (b) Find the horizontal distance ...
Tuesday, September 18, 2012 at 7:06pm

physics
The left ventricle of the heart accelerates blood from rest to a velocity of + 23.2 cm/s. (a) If the displacement of the blood during the acceleration is + 1.69 cm, determine its acceleration (in cm/s2). (b) How much time does blood take to reach its final velocity?
Tuesday, September 18, 2012 at 6:09pm

physics
A VW Beetle goes from 0 to 59.0 mi/h with an acceleration of +2.35 m/s2. (a) How much time does it take for the Beetle to reach this speed? (b) A top-fuel dragster can go from 0 to 59.0 mi/h in 0.700 s. Find the acceleration (in m/s2) of the dragster.
Tuesday, September 18, 2012 at 6:09pm

physics
A car is traveling along a straight road at a velocity of +32.7 m/s when its engine cuts out. For the next 1.04 seconds, the car slows down, and its average acceleration is . For the next 5.23 seconds, the car slows down further, and its average acceleration is . The velocity...
Tuesday, September 18, 2012 at 6:09pm

physics
A ball is thrown straight upward and rises to a maximum height of 14.6 m above its launch point. At what height above its launch point has the speed of the ball decreased to one-half of its initial value?
Tuesday, September 18, 2012 at 6:08pm

physics
A ball is thrown vertically upward, which is the positive direction. A little later it returns to its point of release. The ball is in the air for a total time of 7.84 s. What is its initial velocity? Neglect air resistance.
Tuesday, September 18, 2012 at 6:06pm

physics
A golf ball is dropped from rest from a height of 8.40 m. It hits the pavement, then bounces back up, rising just 5.30 m before falling back down again. A boy then catches the ball when it is 1.20 m above the pavement. Ignoring air resistance, calculate the total amount of ...
Tuesday, September 18, 2012 at 6:05pm

physics
a sprinter accelerates from rest to 10 m/s in 1.3s. What is her acceleration a) in m/s^2> b) km/n^2?
Tuesday, September 18, 2012 at 6:04pm

physics
At highway speed, a particular car is capable of an acceleration of about 1.7m/s^2.At this rate how long does it take to accelerate from 90 km/h to 110 km/h? (in seconds)
Tuesday, September 18, 2012 at 6:03pm

physics
A sports car accelerates from rest to 100 km/h in 6.25. What is the acceleration in m/s^2?
Tuesday, September 18, 2012 at 6:01pm

Physics
A small bug is nestled between a 1-kg block and a 2-kg block on a frictionless table. A horizontal force can be applied to either of the blocks as shown in figure Q5.24 (i) In which situation illustrated in the figure (a) or (b), does the bug have a better chance of survival, ...
Tuesday, September 18, 2012 at 5:31pm

physics
A top fuel dragster covers the quarter mile in 4.5 seconds. what is its speed in miles per hour? please tell me step by step what to do.
Tuesday, September 18, 2012 at 5:13pm

physics
A major league pitcher can throw a baseball in excess of 40.8 m/s. if a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 15.4 m away from the point of release?
Tuesday, September 18, 2012 at 4:04pm

Physics
A meteoroid is speeding through the atmosphere, traveling east at 14.8 km/s while descending at a rate of 12.5 km/s. What is its speed, in km/s?
Tuesday, September 18, 2012 at 4:03pm

Physics 1
A jetliner is moving at a speed of 305 m/s. The vertical component of the plane's velocity is 38.9 m/s. Determine the magnitude of the horizontal component of the plane's velocity.
Tuesday, September 18, 2012 at 4:02pm

Physics
Two trees have perfectly straight trunks and are both growing perpendicular to the flat horizontal ground beneath them. The sides of the trunks that face each other are separated by 1 m. A frisky squirrel makes three jumps in rapid succession. First, he leaps from the foot of ...
Tuesday, September 18, 2012 at 4:00pm

physics
a heavy crate accidentally falls from high flying plane just as it flies directly above a shiny red car parked in a lot. relative to the car, where does the crate crash?
Tuesday, September 18, 2012 at 2:26pm

Physics
In reahcing her destination, a backpacker walks with an average velocity of 1.29 m/s, due west. This average velocity results because she hikes for 6.44 km with an average velocity of 2.59 m/s, due west, turns around, and hikes with an average velocity of 0.44 m/s, due east. ...
Tuesday, September 18, 2012 at 2:12pm

physics
physics - asa, Tuesday, September 18, 2012 at 1:25pm can yu help me thanks in advanec. imageshack . us /photo/ my-images//593/questionpb.png/
Tuesday, September 18, 2012 at 1:27pm

physics
A 826 g rocket, initially at rest, lifts vertically off the launching pad reaching a velocity of 373 m/s in 7.9 seconds. To the nearest tenth of a Newton, how much thrust (a type of force) acts to produce the rocket's motion?
Tuesday, September 18, 2012 at 1:19pm

physics
A science student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of 18.0 m/s. The student throws a ball along a path that she judges to make an initial angle of 68.0° with the horizontal and to be in line with the track. ...
Tuesday, September 18, 2012 at 12:47pm

physics
discuss the relationship of the following variables with the centripetal force: a.)radius of revolution b.)mass of the object c.)speed of revolution.
Tuesday, September 18, 2012 at 10:56am

physics
what is the acceleration of a point on the time of a flywheel 0.90 m in diameter, turning at the rate of 1200 rev/min?
Tuesday, September 18, 2012 at 10:33am

physics
A watermelon cannon fires a watermelon vertically up into the air at a velocity of + 9.50 m/s, starting from an initial position 1.20 meters above the ground. When the watermelon reaches the peak of its flight, what is the elapsed time in sec?
Tuesday, September 18, 2012 at 10:32am

Physics
I am in need of some basic tools in which to become better prepared to excel in my "Conceptual Physics" college course. I am a retired veteran of the Army and have not been in school for 25 years. Some reference charts for Trigonometry, basic glossary for any ...
Tuesday, September 18, 2012 at 7:05am

Physics
Consider a space pod somewhere between earth and the moon, at just the right distance so that the gravitational attractions to Earth and Moon are equal. Is this location nearer Earth or Moon?
Tuesday, September 18, 2012 at 1:12am

Physics
The space probe Deep Space 1 was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of time with the ...
Tuesday, September 18, 2012 at 12:51am

physics
Traveling at a speed of 18.3 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.540. What is the speed of the automobile after 1.33 s have elapsed? Ignore the effects of ...
Tuesday, September 18, 2012 at 12:47am

physics
A 4.85-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.440. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an ...
Tuesday, September 18, 2012 at 12:46am

physics
One of the fastest recorded pitches in major-league baseball, thrown by Tim Lincecum in 2009, was clocked at 101.0 mi/h (see the figure). If a pitch were thrown horizontally with this velocity, how far would the ball fall vertically by the time it reached home plate, 60.5 ft ...
Tuesday, September 18, 2012 at 12:17am

Physics
You are in a hot-air balloon that, relative to the ground, has a velocity of 6.14 m/s in a direction due east. You see a hawk moving directly away from the balloon in a direction due north. The speed of the hawk relative to you is 2.44 m/s. What are (a) the magnitude and (b) ...
Tuesday, September 18, 2012 at 12:15am

physics
(a) If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 3.43 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2? m (b) Repeat for Mars, where the acceleration due to gravity...
Tuesday, September 18, 2012 at 12:14am

Physics
A wrench falls out of the gondola of a balloon that is 830 m above the ocean. Assuming negligible air resistance, what was the wrench’s speed as it hit the water? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s
Tuesday, September 18, 2012 at 12:01am

physics
An electron of mass 9.11 10-31 kg has an initial speed of 2.85 105 m/s. It travels in a straight line, and its speed increases to 6.93 105 m/s in a distance of 5.50 cm. Assume its acceleration is constant.
Monday, September 17, 2012 at 11:50pm

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