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March 3, 2015

March 3, 2015

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

A meteoroid is speeding through the atmosphere, traveling east at 15.5 km/s while descending at a rate of 10.6 km/s. What is its speed, in km/s?
*Saturday, October 11, 2014 at 1:56pm*

**Physics**

A pilot gets into trouble flying 2000m above the pacific ovean. He flies 550 km/h [S 30(degree)W] with a wind from the NW of 100 km/h. he ejects himself at a velocity of 10m/s [upwards]. What is his velocity at the instant he hits the ocean surface? Express your answer in km/h.
*Saturday, October 11, 2014 at 1:15pm*

**physics**

A 78 kg bag of mortar mix is sitting in the back of a truck rounding a traffic circle of radius 27 m at a speed of 21 km/h. Using the truck's frame of reference, find the force of contact between the bag and the side of the truck. Assume that the floor at the back of the ...
*Saturday, October 11, 2014 at 12:06pm*

**physics**

Assume that a particular crash test expert can withstand 18 times the acceleration due to gravity. Find the shortest distance over which her car can be brought to a stop from a speed of 78 km/h without the acceleration exceeding 18g.
*Saturday, October 11, 2014 at 12:03pm*

**physics**

Four forces are acting on an object. Force 1 has a magnitude of 5N at an angle of 70° above the +x-axis; force 2 has a magnitude of 8N at an angle of 35° above the +x-axis; force 3 has a magnitude of 4N at an angle of 20° above the -x-axis; force 4 has a magnitude ...
*Saturday, October 11, 2014 at 11:51am*

**physics**

An object has three component velocities: 5mi/hr toward the east, 12mi/hr toward the south, and 8mi/hr toward the northwest. Find the resultant velocity of the object. For resultant velocity, I got 6mi/hr I don't understand how to find the direction angle and direction (ex...
*Saturday, October 11, 2014 at 11:31am*

**physics**

An airplane whose speed is 150km/hr climbs from a runway at an angle of 20° above the horizontal. What is its altitude two minutes after takeoff? How many kilometers does it travel in a horizontal direction during this two minute period? Find the altitude and horizontal ...
*Saturday, October 11, 2014 at 11:29am*

**Physics**

a car enters a 300m radius flat curve on a rainy day when the coefficient of static friction is between its tires and the road is .600. What is the maximum speed a car can travel around a curve without sliding.
*Saturday, October 11, 2014 at 10:29am*

**Physics**

A ball is tied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00 m making 0.700 revolutions per second. What is the centripetal acceleration of the ball?
*Saturday, October 11, 2014 at 10:01am*

**Physics**

- a 1200 W motor bike can move at a maximum speed of 30.0 m/s . how much force does the motor exert? - what would be the average momentum of 60.0 kg sprinter who finishes 100.0 m in 60 s?
*Saturday, October 11, 2014 at 5:32am*

**physics**

a force of 3.00 N acts through a distance of 12 m in the direction of the force. find the work done
*Saturday, October 11, 2014 at 4:43am*

**Physics**

An object has three component velocities: 5mi/hr toward the east, 12mi/hr toward the south, and 8mi/hr toward the northwest. Find the resultant velocity of the object. For resultant velocity, I got 6mi/hr I don't understand how to find the direction angle and direction (ex...
*Friday, October 10, 2014 at 10:51pm*

**Physics**

The potential difference between the plates of a capacitor is 335 V. Midway between the plates, a proton and an electron are released. The electron is released from rest. The proton is projected perpendicularly toward the negative plate with an initial speed. The proton ...
*Friday, October 10, 2014 at 10:40pm*

**Physics**

A 60.0 kg person rides in elevator while standing on a scale. The elevator has an acceleration 2.00 m/s^2 upward. What is the reading on the scale?
*Friday, October 10, 2014 at 10:04pm*

**physics**

While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 6.93 m/s. The stone subsequently falls to the ground, which is 17.1 m below the point where the stone leaves your hand. At what speed does the stone impact the ground? How ...
*Friday, October 10, 2014 at 10:00pm*

**physics**

Calculate the power output of a 1.7g spider as it walks up a windowpane at 2.5cm/s . The spider walks on a path that is at 25 ∘ to the vertical.
*Friday, October 10, 2014 at 9:46pm*

**College Physics**

A 0.300-kg ice puck, moving east with a speed of 5.86m/s , has a head-on collision with a 0.990-kg puck initially at rest. Assume that the collision is perfectly elastic. What is the speed of the 0.300-kg puck after the collision? What ise the speed of the 0.990-kg puck after ...
*Friday, October 10, 2014 at 8:01pm*

**Physics**

Block B in the figure(Figure 1) rests on a surface for which the static and kinetic coefficients of friction are 0.65 and 0.40, respectively. The ropes are massless.What is the maximum mass of block A for which the system is in equilibrium? (Consider the state of the system ...
*Friday, October 10, 2014 at 8:01pm*

**physics**

A 0.300-kg ice puck, moving east with a speed of 5.86m/s , has a head-on collision with a 0.990-kg puck initially at rest. Assume that the collision is perfectly elastic. What is the speed of the 0.300-kg puck after the collision? What ise the speed of the 0.990-kg puck after ...
*Friday, October 10, 2014 at 7:47pm*

**physics**

A 580 kg cannon and a supply of 41 cannon balls, each with a mass of 38.9 kg, are inside a sealed railroad car with a mass of 31000 kg and a length of 53 m. The cannon fires to the right; the car recoils to the left. The cannon balls remain in the car after hitting the wall. ...
*Friday, October 10, 2014 at 6:59pm*

**Physics**

Find the magnitude and direction of the resultant R of the three vectors shown in figure 1.3. The vectors have the following magnitudes: A=5.0, B=7.9, and C=8.0. Express the direction of the vector sum by specifying the angle it makes with the positive x-axis, with the ...
*Friday, October 10, 2014 at 6:38pm*

**physics**

A ball is thrown horizontally from the roof of a building 47.9 m tall and lands 35.4 m from the base. What was the ball's initial speed in m/s? Hint: Find the horizontal velocity by calculating the time of flight and using the horizontal distance.
*Friday, October 10, 2014 at 6:37pm*

**Physics Homework Help**

1.) Auston’s racecar has a speed of 80 m/s when Auston releases a drag parachute. If the parachute causes a deceleration of -4 m/s2, how far will the car travel before it stops? 2.) Jordan throws a golfball straight up from the top of a building 50 meters high. The ...
*Friday, October 10, 2014 at 6:34pm*

**Science Physics**

How long would it take a 4.50-kW motor to raise a 175-kg boiler to a platform 15.0 m above the floor? Is this correct? 175*9.80*15.0/4.50
*Friday, October 10, 2014 at 6:09pm*

**Physics**

An airplane whose speed is 150km/hr climbs from a runway at an angle of 20° above the horizontal. What is its altitude two minutes after takeoff? How many kilometers does it travel in a horizontal direction during this two minute period? My work: 150cos(20) = 140.9 150sin(...
*Friday, October 10, 2014 at 5:57pm*

**Math Physics**

A wattmeter shows that a motor is drawing 2200w. What horsepower is being delivered? Is this correct? 2200/746 = 2.95
*Friday, October 10, 2014 at 5:50pm*

**Physics**

A wattmeter shows that a motor is drawing 2200w. What horsepower is being delivered? Is this correct? 2200/746 = 2.95
*Friday, October 10, 2014 at 5:45pm*

**Physics**

Four forces are acting on an object. Force 1 has a magnitude of 5N at an angle of 70° above the +x-axis; force 2 has a magnitude of 8N at an angle of 35° above the +x-axis; force 3 has a magnitude of 4N at an angle of 20° above the -x-axis; force 4 has a magnitude ...
*Friday, October 10, 2014 at 5:42pm*

**Physics**

A 0.300-kg ice puck, moving east with a speed of 5.86m/s , has a head-on collision with a 0.990-kg puck initially at rest. Assume that the collision is perfectly elastic. What is the speed of the 0.300-kg puck after the collision? What ise the speed of the 0.990-kg puck after ...
*Friday, October 10, 2014 at 4:49pm*

**physics**

A cyclist maintains a constant velocity of 4.1 m/s headed away from point A. At some initial time, the cyclist is 244 m from point A. What will be his displacement from his starting position after 60 s?
*Friday, October 10, 2014 at 3:43pm*

**physics**

A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. An 740-kg helicopter rises from rest to a speed of 7.6 m/s in a time of 3.1 s. During this time it climbs to a height of 8.6 m. What is...
*Friday, October 10, 2014 at 3:25pm*

**physics**

A basketball player makes a jump shot. The 0.610-kg ball is released at a height of 1.90 m above the floor with a speed of 7.08 m/s. The ball goes through the net 3.04 m above the floor at a speed of 4.29 m/s. What is the work done on the ball by air resistance, a ...
*Friday, October 10, 2014 at 3:24pm*

**physics**

A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.80 m. With the string hanging vertically, the object is given an initial velocity of 2.6 m/s parallel to the ground and swings upward on a ...
*Friday, October 10, 2014 at 3:23pm*

**physics**

An astronaut is traveling in a space vehicle moving at 0.520c relative to the Earth. The astronaut measures her pulse rate at 74.0 beats per minute. Signals generated by the astronaut's pulse are radioed to the Earth when the vehicle is moving in a direction perpendicular...
*Friday, October 10, 2014 at 2:47pm*

**Physics**

A highway curve with a radius of 750 m is banked properly for a car traveling 100 km/h. If a 1600- kg Porshe 928S rounds the curve at 220 km/h, how much sideways force must the tires exert against the road if the car does not skid?
*Friday, October 10, 2014 at 1:29pm*

**Physics - Flux**

The coil has a radius of 8 cm and 110 turns. While moving the magnet farther away from the coil, at a certain point in time, the voltage meter shows -390 mV. What is the magnitude of the rate of change of the flux through the coil?
*Friday, October 10, 2014 at 1:26pm*

**Physics - Conducting Rails**

Two conducting rails 39.2 cm apart rest on a 4.11° ramp. They are joined at the bottom by a 0.520 Ω resistor, and at the top a copper bar of mass 0.0450 kg is laid across the rails. The whole apparatus is immersed in a vertical 0.580 T field. What is the terminal (...
*Friday, October 10, 2014 at 1:24pm*

**Physics**

A toy gun uses a spring to shoot a ball with a mass of 5.0 g. The spring is “loaded” by compressing it 5.0 cm and has a spring constant of 288 N/m. The end of the spring is at the end of the gun (the ball does not travel any distance inside the gun after the spring) ...
*Friday, October 10, 2014 at 12:17pm*

**physics**

Imagine that you throw a ball vertically upwards from the rooftop of a building. The ball abandons your hand at a point that has the same height as the railway of the rooftop with an ascending speed of 15m/s, been left in free falling. Coming down the ball crosses the railway...
*Friday, October 10, 2014 at 10:58am*

**Physics**

I'm having a bit of trouble with this problem. A ball is thrown upwards and stays in the air for 3.65 seconds. What is the initial velocity? (I use an acceleration of -10 m/s/s) I got an answer of 18.25 m/s/s but I'm not sure that it's correct. I would love some help!
*Friday, October 10, 2014 at 10:46am*

**Physics**

A bush baby, an African primate, is capable of leaping vertically to the remarkable height of 2.3 m. To jump this high, the bush baby accelerates over a distance of 0.14m while extending the legs. The acceleration during the jump is approximately constant. What is the ...
*Friday, October 10, 2014 at 10:42am*

**physics**

A car traveling at 27 miles per hour rounds a curve such that it has a centripetal acceleration of 8.7 m/s2. To the nearest meter, what is the radius of the curve?
*Friday, October 10, 2014 at 9:55am*

**physics**

a window with a smooth hinge at the top is held open at an angle 30 degrees to the vertical by a horizontal force applied to the center of it lower edge. the force of gravity on the window is 3kgf acting through its mid point. draw a scale diagram of the arrangement and ...
*Friday, October 10, 2014 at 9:08am*

**physics**

Two forces of resultant 100N are prependicular to each other. If one of them makes angle 60degree with the resultant, calculate the magnitude of the forces. (Sin60degree=0.87, cos60degree=0.5)
*Friday, October 10, 2014 at 7:49am*

**Physics**

What is an electric kettles flow diagram?
*Friday, October 10, 2014 at 6:12am*

**physics**

find the change in momentum of a car weighing 1500kg when its speed increases from 36km/h to 72km/h uniformly
*Friday, October 10, 2014 at 5:40am*

**Physics**

Two masses, m1 = 25.0 kg and m2 = 45.0 kg, are attached by a massless rope over a massless pulley as shown above?The angle of the frictionless incline is 27.0 degrees . Assume that m2 starts at rest and falls a vertical distance of 3.00 m. Assume m1 also starts at rest and the...
*Friday, October 10, 2014 at 3:10am*

**Physics**

I was given a problem that has a triangle shape, which two sides should represent strings. The axial area that is rotating has an angle of 40 degrees. And it rotates by w (omega) = 1 Rad/Sec. I have to find tension of both the strings. How would I exactly start the problem? I...
*Friday, October 10, 2014 at 1:51am*

**Physics**

I have some trouble starting the problem. I don't know what equations to start off with or where to start off and end with. Would I use the equation Ac = RW^2 or the sum of Fc = m x (Vt^2/R)? A ferris wheel rotates by 2 m/s. The radius is 15 meter. Find the apparent weight...
*Friday, October 10, 2014 at 1:48am*

**physics**

A raindrop has a mass of 5.6 × 10-7 kg and is falling near the surface of the earth. Calculate the magnitude of the gravitational force exerted (a) on the raindrop by the earth and (b) on the earth by the raindrop.
*Friday, October 10, 2014 at 1:31am*

**Physics**

A camera falls from a blimp that is 399 m above the ground and rising at a speed of 9.75 m/s. Find the maximum height reached by the camera with respect to the ground. The acceleration of gravity is 9.8 m/s^2.Answer in units of m. b)Find the speed at which it hits the ground....
*Friday, October 10, 2014 at 12:38am*

**physics**

a car accelerates uniformly from rest to 29 m/s in 12s along a level of road. ignoring friction, determine the average power (hp) required to accelerate the car if the weight of the car is 1.2 x 10^4 N. I need help setting up
*Thursday, October 9, 2014 at 11:59pm*

**Physics**

I'm having a bit of trouble with this problem. A ball is thrown upwards and stays in the air for 3.65 seconds. What is the initial velocity? (I use an acceleration of -10 m/s/s) I got an answer of 18.25 m/s/s but I'm not sure that it's correct. I would love some help!
*Thursday, October 9, 2014 at 11:58pm*

**physics**

a vertical spring whose spring constant is 850 n/m stands on a table and is compressed 0.400m. what speed can it give to a .300kg ball when released?
*Thursday, October 9, 2014 at 11:57pm*

**Physics**

A swimmer wishes to swim across a river 600m wide. If he can swim at the rate of 4 km/h in still water and the river flows at 2 km/h, then in what direction must he swim to reach a point exactly opposite to the starting point and when will he reach it? I have no idea how to ...
*Thursday, October 9, 2014 at 11:49pm*

**physics**

A 20 kg object is acted on by a conservative force given by F = -3.0 x - 5.0 x 2, with F in newtons and x in meters. Take the potential energy associated with the force to be zero when the object is at x = 0. (a) What is the potential energy of the system associated with the ...
*Thursday, October 9, 2014 at 11:23pm*

**Physics**

The mass of a sports car is 1200 kg. The shape of the car is such that the aerodynamic drag coefficient is 0.250 and the frontal area is 2.30 m2. Neglecting all other sources of friction, calculate the initial acceleration of the car ,if it has been traveling at 85 km/h and is...
*Thursday, October 9, 2014 at 11:01pm*

**physics**

Two people jump out of an airplane. They hold on to each other while falling straight down at a shared terminal speed of 60.7 m/s. Suddenly, they push away from each other. Immediately after separation, the first skydiver (who has a mass of 89.3 kg) has the following velocity ...
*Thursday, October 9, 2014 at 10:40pm*

**physics**

22) A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of A) less than 1 unit. B) more than 1 unit. C) 1 unit. D) not enough ...
*Thursday, October 9, 2014 at 10:37pm*

**ap physics**

A 52kg skier starts at rest and slides 30m down a hill inclined at 12 degrees relative to the horizontal. List five quantities thatbdescribe the motion of the skier and solve for of them( aleast one of them should be be a kinematic quantity). I know these quantities M: 52 kg ...
*Thursday, October 9, 2014 at 10:36pm*

**Physics**

The horizontal surface on which the block of mass 5 kg slides is frictionless. The force of 29 N acts on the block in a horizontal direction and the force of 58 N acts on the block at an angle(top Right). What is the magnitude of the resulting acceleration of the block?
*Thursday, October 9, 2014 at 10:25pm*

**Physics**

An apple falls from a tree and hits the ground 8.83 m below. With what speed will it hit the ground? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s
*Thursday, October 9, 2014 at 10:21pm*

**physics**

The pulley system in Figure 6-25 is used to lift a crate of mass m = 41 kg. Note that a chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume that the masses of the chains, pulleys, and ropes are negligible.
*Thursday, October 9, 2014 at 9:47pm*

**Physics**

There are 2 objects connected with ideal, massless string that is hanging over an ideal (massless and frictionless) pulley. The angled surface is at a 25.0 degree angle. All surfaces are firctionless. A force F1 is applied horizontally as shown to the right on object 2. ...
*Thursday, October 9, 2014 at 9:23pm*

**Physics**

A grenade is thrown up into the air with an initial velocity of 27 m/s. How long does it take to return to the thrower's hand? I got 5.4 s, but I am very unsure.
*Thursday, October 9, 2014 at 7:57pm*

**physics**

A bush baby, an African primate, is capable of leaping vertically to the remarkable height of 2.3 m. To jump this high, the bush baby accelerates over a distance of 0.14m while extending the legs. The acceleration during the jump is approximately constant. -What is the ...
*Thursday, October 9, 2014 at 7:46pm*

**Science- Physics**

A young girl (m= 30 kg) rides a skateboard (m= 3.2 kg) at a speed of 4.2 m/s. (a) How much work does the girl have to do to bring herself to a stop? (b) How far does she travel if it takes 6.0 s to stop? (c) What is the magnitude of the stopping force? So I know W=Fd, but I ...
*Thursday, October 9, 2014 at 7:33pm*

**Physics**

A young girl (m= 30 kg) rides a skateboard (m= 3.2 kg) at a speed of 4.2 m/s. (a) How much work does the girl have to do to bring herself to a stop? (b) How far does she travel if it takes 6.0 s to stop? (c) What is the magnitude of the stopping force? So I know W=Fd but I am...
*Thursday, October 9, 2014 at 7:30pm*

**physics**

A grenade thrown straight up in the air has an initial speed of 27 m/s. How long will it take before it returns to the thrower's hand?
*Thursday, October 9, 2014 at 7:28pm*

**Physics**

A bush baby, an African primate, is capable of leaping vertically to the remarkable height of 2.3 m. To jump this high, the bush baby accelerates over a distance of 0.14m while extending the legs. The acceleration during the jump is approximately constant. 1)What is the ...
*Thursday, October 9, 2014 at 7:15pm*

**physics**

Heather and Jerry are standing on a bridge 53m above a river. Heather throws a rock straight down with a speed of 12m/s . Jerry, at exactly the same instant of time, throws a rock straight up with the same speed. Ignore air resistance. How much time elapses between the first ...
*Thursday, October 9, 2014 at 7:10pm*

**Physics**

I'm having some trouble figuring out how to do the following question: A ball punted vertically has a hang time of 3.65 seconds. What was its initial velocity? (I use an acceleration of -10 m/s/s) Thanks!
*Thursday, October 9, 2014 at 6:54pm*

**physics**

What force is necessary to keep a 2.00x10^3 car moving up a 15.0 degree incline at a constant velocity? (Mu=.200)
*Thursday, October 9, 2014 at 6:48pm*

**physics**

Heather and Jerry are standing on a bridge 53m above a river. Heather throws a rock straight down with a speed of 12m/s . Jerry, at exactly the same instant of time, throws a rock straight up with the same speed. Ignore air resistance. How much time elapses between the first ...
*Thursday, October 9, 2014 at 6:44pm*

**Physics Help Please!!!!**

A car is at rest on a horizontal road. What is the value of the frictional force? Explain your answer. A bison stands at rest on the horizontal ground. What is the value of the frictional force? Explain. The normal force always has a direction perpendicular to the surface that...
*Thursday, October 9, 2014 at 5:50pm*

**physics**

a rock is thrown at a downwards angle of 15 degrees from the top of a 120 m cliff with a speed of 25 m/s. what will be its speed when it strokes the ground at the base of the cliff? I know to use the conservation of energy but I don't know how to set it up.
*Thursday, October 9, 2014 at 4:43pm*

**Physics**

The battleship Massachusetts' 16" guns could fire a 1-ton shell with an initial velocity of 800m/s. If it fired its guns at an angle of 45 degrees above horizontal, how high and how far would the shells travel? I'm pretty sure that I need to use the Pythagorean ...
*Thursday, October 9, 2014 at 4:30pm*

**physics**

a high jumper approaches the takeoff point at a speed of 7.20 m/s. Assuming that only this speed determines the height to which he can rise, find the maximum height at which the jumper can clear the bar.
*Thursday, October 9, 2014 at 4:24pm*

**Physics**

A 1300kg car going 20m/s has to stop suddenly. The driver locks the brakes, and the car skids to a halt in a distance of 64m . What was the car's acceleration while stopping? How much work was done by friction to stop the car? What is the coefficient of kinetic friction ...
*Thursday, October 9, 2014 at 3:53pm*

**physics**

An astronaut comes loose while outside the spacecraft and finds himself floating away from the spacecraft with only a big bag of tools. In desperation, the astronaut throws his bag of tools in the direction of his motion (away from the space station). The astronaut has a mass ...
*Thursday, October 9, 2014 at 3:31pm*

**math physics**

The handle of a vegetable wagon makes an angle of 25.0° If the peddler exerts a force of 35.0 lb along the handle, how muchwork does the peddler do in pulling the cart 1.00 mi? Is this correct? 35.0*1.00coseine25.0degrees=31.720
*Thursday, October 9, 2014 at 2:01pm*

**idk **

what grade level is physics??
*Thursday, October 9, 2014 at 1:44pm*

**physics **

An ice skater is traveling in a straight, horizontal line on the ice with a velocity of v = 6.5 m/s in the positive x-direction. The coefficient of kinetic friction between the skates and the ice is μk = 0.23. v = 6.5 m/s μk = 0.23 A. Using the expression for normal...
*Thursday, October 9, 2014 at 1:31pm*

**Physics **

A horizontal force, F1 = 85 N, and a force, F2 = 18.4 N acting at an angle of θ to the horizontal, are applied to a block of mass m = 2.1 kg. The coefficient of kinetic friction between the block and the surface is μk = 0.2. The block is moving to the right. A. Solve...
*Thursday, October 9, 2014 at 1:30pm*

**Physics **

Suppose your car was mired deeply in the mud and you wanted to use the method illustrated in the figure to pull it out. T = 11000 N A. What force would you have to exert perpendicular to the center of the rope to produce a force of 11000 N on the car if the angle is 2.00° ...
*Thursday, October 9, 2014 at 1:29pm*

**Physics **

A crate sets on wooden horizontal surface (a wooden floor). The figure shows a top view of this looking down onto the crate (gravity would be acting into the page). Man one and man two apply forces F1 and F2, at angles of θ1 and θ2 respectively, with the goal of ...
*Thursday, October 9, 2014 at 1:27pm*

**physics**

Forces of 4.57 N and 4.74 N act at right angles on a reddish-green block of mass 5.76 kg. How much acceleration occurs?
*Thursday, October 9, 2014 at 1:27pm*

**physics**

Calculate the distance Michael will travel if he maintain an average speed of 9.4 m/s for 2.2 seconds
*Thursday, October 9, 2014 at 1:26pm*

**math-physics**

How much work is done lifting a wrecking ball 6.50 m above the ground? So the formula for this problem would be: W=fs F=200kg S=6.50m (200)(6.50)=1300
*Thursday, October 9, 2014 at 1:19pm*

**physics**

The weight of an astronaut plus his space suit on the Moon is only 270 N. A. How much do they weigh on Earth, in Newtons, assuming the acceleration due to gravity on the moon is 1.67m/s^2= 1584is this right? B. What is the mass of the astronaut and his space suit on the moon ...
*Thursday, October 9, 2014 at 1:13pm*

**physics-intro**

How much work is done in lifting 450 lb of cement 75 ft above the ground? So basically its W=fs (450lb)(75ft)=33750lb
*Thursday, October 9, 2014 at 1:05pm*

**physics**

a particle is moving in a straight line the particle starts with speed 5ms and accelerates at a constant rate of 2ms for 8s it then decelerates at a constant rate coming to rest in a further 12s find the total distance during 20s it is 230 but i dont understand how
*Thursday, October 9, 2014 at 12:34pm*

**physics**

A ring of mass m slides on a smooth vertical rod. A light string is attached to the ring and is passing over a smooth peg distant a from the rod, and at the other end of the string is a mass The ring is held on a level with the peg and released. It first comes to rest after ...
*Thursday, October 9, 2014 at 11:54am*

**physics,electrostatics**

A 40uf parallel plate capacitor is charged to 12v. The capacitor is removed from the battery and the separation distance increased from 2mm to 3mm. What is the total charge on the capacitor? How much energy was stored in the capacitor when the distance was 2mm? By how much is ...
*Thursday, October 9, 2014 at 11:27am*

**Physics**

In the system shown in the figure, suppose the block has a mass of 2.7kg , the spring has a force constant of 500N/m , and the coefficient of kinetic friction between the block and the floor is 0.18. Find the work done on the block by the spring and by friction as the block is...
*Thursday, October 9, 2014 at 11:07am*

**Physics**

A man drags a 180 lb crate across a floor by pulling on a rope inclined at 20.0 degrees with the horizontal. If the coefficient of static friction is 0.560 , and the coefficient of kinetic friction is 0.350, find the acceleration (in feet/second^2) of the crate at the instant ...
*Thursday, October 9, 2014 at 10:46am*

**physics**

An earthquake wave has a wave length of 523m and travels with a speed of 4.6km through a portiin of Earths crust. a) what is its frequency? b) if it travels into a different portion of Earths crust, where its speed is 7.5km/s,what is its new wavelength?
*Thursday, October 9, 2014 at 10:28am*

**physics**

a man fires a rock of a sling shot upwards. the rock has initial velocity of 15m/s. How long will it take for the rock to reach its highest point??
*Thursday, October 9, 2014 at 10:15am*

**physics**

A car drives at 15 m/s and has an air resistance force of 244 N. What is the air resistance force at 30 m/s?
*Thursday, October 9, 2014 at 10:03am*

**physics **

A particle of mass 10 kg is slowly lifted up to a height of 10 metre then calculate the workdone by external and gravity force ?
*Thursday, October 9, 2014 at 9:59am*

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