Sunday

July 24, 2016
**physics**

On a spacecraft, two engines are turned on for 910 s at a moment when the velocity of the craft has x and y components of v0x = 5710 m/s and v0y = 7490 m/s. While the engines are firing, the craft undergoes a displacement that has components of x = 5.78 x 106 m and y = 6.17 x ...
*Monday, February 3, 2014 by anonymous*

**physics**

The three displacement vectors in the drawing have magnitudes of A = 5.73 m, B = 6.48 m, and C = 3.12 m. Find the resultant ((a) magnitude and (b) directional angle) of the three vectors by means of the component method. Express the directional angle as an angle above the ...
*Monday, February 3, 2014 by anonymous*

**physics**

A soccer player kicks the ball toward a goal that is 15.0 m in front of him. The ball leaves his foot at a speed of 17.1 m/s and an angle of 35.0 ° above the ground. Find the speed of the ball when the goalie catches it in front of the net.
*Monday, February 3, 2014 by anonymous*

**physics**

Each tire of an automobile has an area of 0.026 m^2 in contact with the ground. The weight of the automobile is 26,000 N. What is the pressure in the tires?
*Monday, February 3, 2014 by barbara ann*

**physics**

A criminal is escaping across a rooftop and runs off the roof horizontally at a speed of 5.0 m/s, hoping to land on the roof of an adjacent building. Air resistance is negligible. The horizontal distance between the two buildings is D, and the roof of the adjacent building is ...
*Monday, February 3, 2014 by anonymous*

**Physics**

You throw a ball straight into the air from a height of 4 feet and with a speed of 8.22 m/s. The moment the ball leaves your hand you start running away at a speed of 3.36 m/s. How far are you from the ball, the moment it hits the ground?
*Monday, February 3, 2014 by PLEASE HELP!!!!!*

**physics**

A soccer player kicks the ball toward a goal that is 15.0 m in front of him. The ball leaves his foot at a speed of 17.1 m/s and an angle of 35.0 ° above the ground. Find the speed of the ball when the goalie catches it in front of the net.
*Monday, February 3, 2014 by anonymous*

**Physics 1**

Suppose the water at the top of Niagara Falls has a horizontal speed of 2.59 m/s just before it cascades over the edge of the falls. At what vertical distance below the edge does the velocity vector of the water point downward at a 67.9 ° angle below the horizontal?
*Monday, February 3, 2014 by anonymous*

**Physics 1**

On a spacecraft, two engines are turned on for 910 s at a moment when the velocity of the craft has x and y components of v0x = 5710 m/s and v0y = 7490 m/s. While the engines are firing, the craft undergoes a displacement that has components of x = 5.78 x 106 m and y = 6.17 x ...
*Monday, February 3, 2014 by anonymous*

**physics**

Find the pottential energy of a boy of mass 10kg standing on a building floor 10 meters above the ground level p.e?
*Monday, February 3, 2014 by Salisu*

**physics**

A 350 g block is attached to a vertical spring whose stiffness constant is 12 N/m . The block is released at the position where the spring is unextended. a) What is the maximum extension of the spring? b)How long does it take the block to reach the lowest point?
*Monday, February 3, 2014 by Az*

**Physics 1**

A criminal is escaping across a rooftop and runs off the roof horizontally at a speed of 5.0 m/s, hoping to land on the roof of an adjacent building. Air resistance is negligible. The horizontal distance between the two buildings is D, and the roof of the adjacent building is ...
*Monday, February 3, 2014 by anonymous*

**Physics**

You throw a ball straight into the air from a height of 4 feet and with a speed of 8.22 m/s. The moment the ball leaves your hand you start running away at a speed of 3.36 m/s. How far are you from the ball, the moment it hits the ground?
*Monday, February 3, 2014 by Anonymous*

**physics**

A 350 g block is attached to a vertical spring whose stiffness constant is 12 N/m . The block is released at the position where the spring is unextended. a) What is the maximum extension of the spring? b)How long does it take the block to reach the lowest point?
*Monday, February 3, 2014 by Az*

**physics: waves**

A simple pendulum of length 1 m is released when it makes an angle of 6 degrees with the vertical. Find: a) The speed at the lowest point; b)If the mass of the bob is 260 g, what is the total energy? Thank You
*Monday, February 3, 2014 by Asp*

**Physics**

After having collected samples along the shore all day long, a marine biologist walks back to her campsite, 3.02 km away. Her dog runs ahead, at twice the speed, reaches the campground and turns around until it meets her again. Then, the dog proceeds to run back to the ...
*Monday, February 3, 2014 by Mel*

**physics**

A 350 g block is attached to a vertical spring whose stiffness constant is 12 N/m . The block is released at the position where the spring is unextended. a) What is the maximum extension of the spring? b)How long does it take the block to reach the lowest point?
*Monday, February 3, 2014 by Az*

**physics**

A 350 g block is attached to a vertical spring whose stiffness constant is 12 N/m . The block is released at the position where the spring is unextended. a) What is the maximum extension of the spring? b)How long does it take the block to reach the lowest point?
*Monday, February 3, 2014 by Az*

**Physics**

You throw a ball straight into the air from a height of 4 feet and with a speed of 8.22 m/s. The moment the ball leaves your hand you start running away at a speed of 3.36 m/s. How far are you from the ball, the moment it hits the ground? (what are the formulas used?)
*Monday, February 3, 2014 by Mel*

**Physics**

A car is speeding up in the forward direction on a level road. a. The frictional force acting from the road on the tires is pointed forward. b. The frictional force acting from the road on the tires is pointed backward. c. There is not enough information to determine the ...
*Monday, February 3, 2014 by Rachel*

**Physics**

Damon, this is my last question for today for you. Thanks for all your help. A gas is at an initial pressure of 1.24104 Pa and occupies a volume of 0.28 m3. The (slow) addition of 23,570 cal of heat to the system causes it to expand in an isobaric manner to a volume of 0.47 m3...
*Monday, February 3, 2014 by Riley *

**short physics question**

What is the significance of the fact that both the horizontal force and motion are both forwards?
*Monday, February 3, 2014 by Diane*

**physics**

a 50-N force is directed at an angle of 50 degrees above the horizontal. resolve this force into vertical and horizontal components.
*Monday, February 3, 2014 by lee*

**Physics**

A 1500-kg car moving north at 27.0 m/s is struck by a 2165-kg car moving east at 13.0 m/s. The cars are stuck together. How fast and in what direction do they move immediately after the collision? 1. Degree north of east? 2. M/S?
*Monday, February 3, 2014 by Sean*

**Physics**

You throw a ball straight into the air from a height of 4 feet and with a speed of 8.22 m/s. The moment the ball leaves your hand you start running away at a speed of 3.36 m/s. How far are you from the ball, the moment it hits the ground?
*Monday, February 3, 2014 by Anonymous*

**Physics**

Your are sitting in your car, which is standing at the side of the road with the engine idling. In the rearview mirror, you see one of your class mates approaching on a bicycle on the sidewalk. The moment the other student passes you, you start accelerating at 2.67 m/s2, ...
*Monday, February 3, 2014 by Anonymous*

**Physics**

An ideal monatomic gas goes from p1 = 180 atm and V1 = 45 m3 to p2 and V2 through an adiabatic process. If p2 = 60 atm, what is V2?
*Monday, February 3, 2014 by Riley *

**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?
*Monday, February 3, 2014 by Riley *

**Physics**

I think I chose the correct answer. In a closed system, two carts have a compressed spring between them. One of the carts has a total mass, including its contents, of 2.0 kg, and the other has total mass of 1.0 kg. Which cart experiences the momentum change of greater ...
*Monday, February 3, 2014 by Laura Khoshaba (Me and I)*

**Physics**

After having collected samples along the shore all day long, a marine biologist walks back to her campsite, 2.12 km away. Her dog runs ahead, at twice the speed, reaches the campground and turns around until it meets her again. Then, the dog proceeds to run back to the ...
*Monday, February 3, 2014 by Anonymous*

**Science--Physics--check answers**

1. A football player pushes a dummy forwards at a constant 0.85m/s for 11m using 7150 J of energy. The dummy has a mass of 120 kg. Find the force the football player exerts, find the frictional force the dummy exerts. - for my answer I got 1176N as the force the football ...
*Monday, February 3, 2014 by Diane*

**Physics**

You throw a ball straight into the air from a height of 4 feet and with a speed of 5.3 m/s. The moment the ball leaves your hand you start running away at a speed of 2.37 m/s. How far are you from the ball, the moment it hits the ground?
*Monday, February 3, 2014 by Anonymous*

**Physics**

Your are sitting in your car, which is standing at the side of the road with the engine idling. In the rearview mirror, you see one of your class mates approaching on a bicycle on the sidewalk. The moment the other student passes you, you start accelerating at 2.97 m/s2, ...
*Monday, February 3, 2014 by Anonymous*

**Physics**

A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage)
*Monday, February 3, 2014 by Riley *

**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.
*Monday, February 3, 2014 by Riley *

**Physics**

Am I correct? Which statement explains why a bicycle is stable when a rider pedals quickly? (Points : 1) The angular momentum vector resists directional change. <------- Applying a torque does not change the angular velocity of the wheel. A rotating object acts like a ...
*Monday, February 3, 2014 by Me and I*

**physics 1**

A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +3.5 m/s and ax = +5.8 m/s2. The y components of the puck's initial velocity and acceleration are ...
*Monday, February 3, 2014 by anonymous*

**Physics**

I was wondering if my answers are correct. 1. A 50kg person is taking a ride on an elevator travelling up at a steady speed of 2.5m/s. Find the time fo the elevator trip if the elevator does 4900 J of work on the person. My answer: First I used the formula f=mg to find the ...
*Monday, February 3, 2014 by Liz*

**Physics**

Am I correct? Two carts have a compressed spring between them and are initially at rest. One of the carts has total mass, including its contents, of 5.0 kg, and the other has total mass of 3.0 kg. If the 3.0 kg cart is moving at 3.0 m/s after the spring is allowed to push the ...
*Monday, February 3, 2014 by Me and I*

**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 ...
*Monday, February 3, 2014 by Riley *

**Physics Please check my answers**

1. A fluid can only be a liquid. True << False 2. One atmosphere is equal to 14.7 psi. True << False 3. In a fluid, pressure depends on the density of the fluid and the depth. True False << 4. Pascal's Principle says that the buoyant force on an object ...
*Monday, February 3, 2014 by Chelsea*

**Physics**

Guide me through this plz. A single 1,300 kg cargo train car is rolling along a train track at 2.0 m/s when 400 kg of coal is dropped vertically into it. What is its velocity right afterward? Assume a closed system. (Points : 1) 1.5 m/s 2.0 m/s 6.5 m/s 0.0011 m/s
*Monday, February 3, 2014 by Me and I*

**physics**

a year ago she measured 98cm from her tree . now it 1.1m tall how much has it grown
*Monday, February 3, 2014 by kjpuij*

**physics**

TWO BOXES A AND B ARE LYING ON THE TABLE AND ARE CONNECTED BY A PIECE OF STRING. THE MASS OF BOX A IS 3KG AND B IS 2KG. A 10N PULLING FORCE, POINTING TO THE RIGHT IS APPLIED TO BOX X CAUSING THE TWO BOXES TO MOVE TOGETHER AT CONSTA SPEED. a) determine the net force on A & B b...
*Monday, February 3, 2014 by THEMBINKOSI GASA*

**Physics Please check my answers**

It's possible for a body to have both rotational and translational motion at the same time. True. << False. 2. The moment of inertia of an object would be different on the surface of the earth than on the surface of the moon. True. << False. 3. The moment of ...
*Monday, February 3, 2014 by Chelsea*

**Physics**

I was wondering if my answers are correct. Thanks in advance. 1. A boy pushes down on a car rolling horizontally down the road. The boy pushes down vertically with 10N of force as the car rolls 3.0m horizontally. What work is done? my answer: 30 N•m (or would it be -30N&#...
*Monday, February 3, 2014 by Liz*

**physics 1**

A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +3.5 m/s and ax = +5.8 m/s2. The y components of the puck's initial velocity and acceleration are ...
*Monday, February 3, 2014 by anonymous*

**Physics**

The acceleration of a particle moving only on a horizontal xy plane is given by , where is in meters per second-squared and t is in seconds. At t = 0, the position vector locates the paticle, which then has the velocity vector . At t = 3.60 s, what are (a) its position vector ...
*Monday, February 3, 2014 by Catherine*

**physics**

On a calm, bright day, you're scuba diving in a deep lake (n = 1.33), 6.30 m away from your sailboat in the horizontal direction. When you are 2.70 m below the surface, the top of the sailboat mast appears to you to be in a direction 31.0° from vertical...
*Monday, February 3, 2014 by physics help*

**physics**

On a calm, bright day, you're scuba diving in a deep lake (n = 1.33), 6.30 m away from your sailboat in the horizontal direction. When you are 2.70 m below the surface, the top of the sailboat mast appears to you to be in a direction 31.0° from vertical...
*Monday, February 3, 2014 by Anonymous*

**physics**

Two speakers, one directly behind the other, are each generating a 579-Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? Take the speed of sound to be 344 m/s.
*Monday, February 3, 2014 by Anonymous*

**physics**

Suppose that a public address system emits sound uniformly in all directions and that there are no reflections. The intensity at a location 20 m away from the sound source is 3.0 × 10-4 W/m2. What is the intensity at a spot that is 87 m away?
*Monday, February 3, 2014 by Anonymous*

**physics**

You are driving down the road and hit a bump which causes your fishing tackle box to bounce out of the bed of your pickup. The box decelerates at a rate of 3 m/s¶ and skids 24 meters before coming to a stop. How fast were you traveling when the box fell out?
*Monday, February 3, 2014 by isabella*

**physics**

I'm driving along at a constant speed in my 3 metre long car when I notice that I am accidentally driving through a red light. If the rear of my car passes under the light 0.3 seconds after the front of my car, how fast am I driving in m/s?
*Monday, February 3, 2014 by suresh*

**physics**

need five differences between compounds and molecules...... got only one that is ;A molecule is formed when two or more atoms join together chemically. A compound is a molecule that contains at least two different elements.
*Monday, February 3, 2014 by leena*

**Physics**

An alloy of mass 225g is heated to 550C. It is quickly placed in 450g of water at 12C. The water is contained in an aluminum calorimeter cup of mass 210g. The final temperature of mixture is 31.7C. Specific heat of aluminum is 0.215 cal/gC. Find the specific heat of alloy.
*Monday, February 3, 2014 by Tsunayoshi*

**PHYSICS**

AGLASS BLOCK WEIGHS 2.5N IN AIR WHEN USUALLY IMMERSED IN WATER THE WEIGHS 15N.CALCULATE APPARENTLOSS IN WATER.
*Monday, February 3, 2014 by GUTOS*

**physics**

A woman on a bridge 104 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 9.78 m more to travel before passing under the bridge. The stone hits the water 5.31 m...
*Sunday, February 2, 2014 by evy*

**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...
*Sunday, February 2, 2014 by christina*

**Physics**

A student drops a rock from a bridge to the water 10.1 m below. The acceleration of gravity is 9.8 m/s^2. With what speed does the rock strike the water? Answer in units of m/s.
*Sunday, February 2, 2014 by Fabricus*

**Physics**

A man at point A directs his rowboat due north toward point B, straight across a river of width 100 m. The river current is due east. The man starts across, rowing steadily at 2.50 m/s and reaches the other side of the river at point C, 150 m downstream from his starting point...
*Sunday, February 2, 2014 by Marissa*

**URGENT PHYSICS**

A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 21.0 m/s. Assuming a uniform rate of increase in angular velocity and a radius of 0.80 m, calculate the angle of this force with respect to the...
*Sunday, February 2, 2014 by Sam *

**Physics**

A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 21.0 m/s. Assuming a uniform rate of increase in angular velocity and a radius of 0.80 m, calculate the angle of this force with respect to the...
*Sunday, February 2, 2014 by Liam*

**Physics**

A severe thunderstorm dumped 2.4 in of rain in 30 min on a town of area 35 km2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.
*Sunday, February 2, 2014 by Catherine*

**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 × 103 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual ...
*Sunday, February 2, 2014 by Catherine*

**Physics**

The 66 kg man's hands in Figure 9-56 are 36 cm apart. His CG is located 85% of the distance from his right hand toward his left. Find the force on each hand due to the ground.
*Sunday, February 2, 2014 by Ilana*

**Physics**

The 66 kg man's hands in Figure 9-56 are 36 cm apart. His CG is located 85% of the distance from his right hand toward his left. Find the force on each hand due to the ground.
*Sunday, February 2, 2014 by Ilana*

**Physics**

The 66 kg man's hands in Figure 9-56 are 36 cm apart. His CG is located 85% of the distance from his right hand toward his left. Find the force on each hand due to the ground.
*Sunday, February 2, 2014 by Ilana*

**Physics**

The 66 kg man's hands in Figure 9-56 are 36 cm apart. His CG is located 85% of the distance from his right hand toward his left. Find the force on each hand due to the ground.
*Sunday, February 2, 2014 by Ilana*

**Physics**

A red ball is thrown down with an initial speed of 1.2 m/s from a height of 25 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 22.9 m/s, from a height of 0.8 meters above the ground. The force of ...
*Sunday, February 2, 2014 by Cam*

**Physics**

Wind is blowing toward south at 8m/s, a runner jogs west at 7 m/s. What is the velocity (speed and direction) of the air relative to the runner?
*Sunday, February 2, 2014 by Curtis*

** Physics**

A blue ball is thrown upward with an initial speed of 19.6 m/s, from a height of 0.5 meters above the ground. 2.4 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 7.9 m/s from a height of 22.1 meters above the ground. The force of ...
*Sunday, February 2, 2014 by Cam*

**physics**

A horizontal spring has a spring constant k = 23.2 N/m. A 0.165 kg mass is attached to the spring and is free to slide on a frictionless surface. The mass is pulled 26.2 cm from the equilibrium point. What is the speed (m/s) of the mass as it passes the equilibrium point?
*Sunday, February 2, 2014 by wilson*

**physics**

a crew member is walking on a tugboat that is pulling a barge. the tugboat is moving at a constant speed upstream in a river that has a constant downstream current. In the situation above, what is at rest relative to the tugboat?
*Sunday, February 2, 2014 by judy*

**Physics**

In a relay race, runner A is carrying a baton and has a speed of 3.0 m/s . When he is 25M behind the starting line, runner B starts from rest and accelerates at .10 m/s^2. How long afterwards will A catch up with B to pass the baton to B?
*Sunday, February 2, 2014 by Jami*

**physics**

ind the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×10^23kg), when Mars is at its closest to Earth (distance = 5.6×10^10m).
*Sunday, February 2, 2014 by bob*

**physics**

Find the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×1023kg), when Mars is at its closest to Earth (distance = 5.6×1010m).
*Sunday, February 2, 2014 by bob*

**Physics**

A man 2m tall whose eye level is 1.84m above the ground looks at his image in a vertical mirror. If the man is to be above to see the whole of his body, determine the minimum length of the vertical mirror
*Sunday, February 2, 2014 by Williams*

**physics**

A 31-m/s velocity vector that makes an angle of 44° counterclockwise from the -x direction. x: y:
*Sunday, February 2, 2014 by Kelby*

**physics**

A rifle bullet is shot horizontally at a velocity of 100 m/s. What is it's vertical velocity after 1 sec? Horizontal velocity after 1 sec?
*Sunday, February 2, 2014 by Anonymous*

**Physics**

A 100W incandescent lamp of filament area 45 mm^2, emits all its energy by radiation into the surrounding space of room at 22C. If the filament emissivity is 0.32, find the temperature of the filament?
*Sunday, February 2, 2014 by Tsunayoshi*

**Physics**

In a physics experiment, 250g of water is placed in a 50g calorimeter cup made of aluminum when both are at 15C. Steam at 100C is completely absorbed by passing it through the water, raising the temperature of water and cup to 45C. Find the mass of steam absorbed. Specific ...
*Sunday, February 2, 2014 by Tsunayoshi*

**physics**

3. A man leaves his home by car and travels 5 km on a road running due East. The driver then turns left and travels 2 km due north to a junction where he joins a road that goes North West and drives a further 2 km. Find his displacement from home by then.
*Sunday, February 2, 2014 by karen*

**Physics Help**

Find the components of the vector A⃗ with length a = 1.00 and angle α=10.0∘ with respect to the x axis as shown. I can't display the figure obviously, but I figured 1 x cos(10) and 1 x sin(10) would give the two components I need, but I'm still getting...
*Saturday, February 1, 2014 by Eiban*

**Physics Help**

Position vector r⃗ has magnitude of 19.4m and direction angle 235 degrees What are the x and y components? (x,y) Find the components of the vector −2r⃗ and the magnitude of the vector?
*Saturday, February 1, 2014 by Eiban*

**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 by John*

**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 by christina*

**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 by Tsion*

**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 by Tsion*

**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 by Anonymous*

**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 by Fabricus*

**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 by Linda*

**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 by Max*

**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 by Chelsea*

**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 by Max*

**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 by jamiera*

**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 by jamiera*

**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 by Tsion*

**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 by Tsion*

**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 by Jamie*