Tuesday

September 30, 2014

September 30, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

A block weighing 71.5 N rests on a plane inclined at 24.1° to the horizontal. The coefficient of the static and kinetic frictions are 0.26 and 0.13 respectively. What is the minimum magnitude of the force F, parallel to the plane, that will prevent the block from slipping...
*Saturday, February 22, 2014 at 1:13pm*

**physics**

You are driving your car over a circular-shaped bump in the road that has a radius of curvature of 75.9 m. A)If the car is traveling at a constant speed of 18.3 m/s, calculate the apparent weight of your 56.1 kg passenger as you pass over the top of the bump. B)What is the ...
*Saturday, February 22, 2014 at 1:00pm*

**physics**

A box of mass 52 kg starts from rest to slide down a ramp that makes an angle of 16.6 degrees with respect to the horizontal. 4.1 seconds later, it has covered a distance of 3.98 meters. What is the coefficient of kinetic friction?
*Saturday, February 22, 2014 at 11:57am*

**physics**

A sled (mass 310 kg) is pulled across a stone floor with a coefficient of kinetic friction of 0.9. The rope that is used to pull it is at an angle alpha of 55 degrees with the horizontal. How hard (i.e., with what magnitude force) do you need to pull to make the sled speed up ...
*Saturday, February 22, 2014 at 11:56am*

**physics**

A professor drives off with his car (mass 850 kg), but forgot to take his coffee mug (mass 0.39 kg) off the roof. The coefficient of static friction between the mug and the roof is 0.7, and the coefficient of kinetic friction is 0.4. What is the maximum acceleration of the ...
*Saturday, February 22, 2014 at 11:49am*

**Physics **

Suppose a straight 1.60mm -diameter copper wire could just "float" horizontally in air because of the force due to the Earth's magnetic field B⃗ , which is horizontal, perpendicular to the wire, and of magnitude 4.2×10−5T . What current would ...
*Saturday, February 22, 2014 at 11:26am*

**physics**

A crate of mass 132 kg is loaded onto the back of a flatbed truck. The coefficient of static friction between the box and the truck bed is 0.22. What is the smallest radius of curvature that the truck can take without the crate slipping, if the speed with which it is going ...
*Saturday, February 22, 2014 at 11:20am*

**physics**

You are driving your car over a circular-shaped bump in the road that has a radius of curvature of 75.9 m. A)If the car is traveling at a constant speed of 18.3 m/s, calculate the apparent weight of your 56.1 kg passenger as you pass over the top of the bump. B)What is the ...
*Saturday, February 22, 2014 at 11:17am*

**physics**

A string under a tension of 42.6 N is used to whirl a rock in a horizontal circle of radius 2.47 m at a speed of 19.7 m/s. The string is pulled in and the speed of the rock increases. When the string is 1.13 m long and the speed of the rock is 46.9 m/s, the string breaks. What...
*Saturday, February 22, 2014 at 11:05am*

**physics**

A block M1 of mass 16.5 kg sits on top of a larger block M2 of mass 26.5 kg which sits on a flat surface. The kinetic friction coefficient between the upper and lower block is 0.425. The kinetic friction coefficient between the lower block and the flat surface is 0.125. A ...
*Saturday, February 22, 2014 at 11:03am*

**Physics**

A man driving his car into 20.0 ft garage with a velocity of 20.0mi/h applies the brakes, producing a constant deceleration. Find the smallest deceleration necessary to avoid striking the back wall of the garage. And find how many seconds it takes for the car to come to rest
*Saturday, February 22, 2014 at 9:27am*

**physics**

calculate the final volume of gas if the original pressure of gas at STP is doubled and its temperature is 3 times.
*Saturday, February 22, 2014 at 8:09am*

**Physics**

You and some friends go bungee jumping, but you are afraid of oscillations which go too fast. Which one of these options would provide the slower oscillations? a) Tying two bungee cords to your feet such that each bungee cord is attached to your feet and the object which you ...
*Saturday, February 22, 2014 at 3:51am*

**Physics 141**

A car is on a circular track of radius r = 100 m. It's tangential speed is 30 m/s. How many lateral gravities does the driver feel?
*Friday, February 21, 2014 at 11:54pm*

**Physics**

An electric dipole is formed from two charges, ±q, spaced 1.00cm apart. The dipole is at the origin, oriented along the y-axis. The electric field strength at the point (x,y)=(0cm,10cm) is 320N/C . What is the charge q? Give your answer in nC. What is the electric field...
*Friday, February 21, 2014 at 11:23pm*

**Science - Start of Physics**

Please help me with the following problem. Given below is the position-time graph representing motions of two runners, Nick and Ian. Use this graph to determine which runner has greater average velocity. I can't put the graph here, so the following should give you guys a ...
*Friday, February 21, 2014 at 10:37pm*

**Physics 141**

A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.60 104 m/s, and the radius of the orbit is 5.50 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8.50 106 ...
*Friday, February 21, 2014 at 9:56pm*

**Physics 141**

A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.60 104 m/s, and the radius of the orbit is 5.50 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8.50 106 ...
*Friday, February 21, 2014 at 8:46pm*

**Physics**

Consider a car is heading down a 5.5° slope (one that makes an angle of 5.5° with the horizontal) under the following road conditions. You may assume that the weight of the car is evenly distributed on all four tires and that the coefficient of static friction is ...
*Friday, February 21, 2014 at 8:42pm*

**Physics**

A string going over a massless frictionless pulley connects two blocks of masses 6.4 kg and 13 kg. As shown on the picture below, the 6.4 kg block lies on a 32◦ incline; the coefficient of kinetic friction between the block and the incline is μ= 0.3. The 13 kg block...
*Friday, February 21, 2014 at 8:36pm*

**Science - Start of Physics**

I need help with the following: Given below is the position-time graph representing motions of two runners, Nick and Ian. Use this graph to determine which runner has greater average velocity. For this one, I know the answer is 2m/0s, but I don't know if they want me to ...
*Friday, February 21, 2014 at 8:33pm*

**Physics**

A skier of mass 59.5 kg comes down a slope of constant angle 1◦ with the horizontal. The acceleration of gravity is 9.8 m/s^2 i. What is the force on the skier parallel to the slope? Answer in units of N. ii. What force normal to the slope is exerted by the skis? Answer ...
*Friday, February 21, 2014 at 8:26pm*

**Physics**

1. Two blocks on a frictionless horizontal surface are connected by a light string. The acceleration of gravity is 9.8 m/s^2. Find the acceleration of the system. Answer in units of m/s^2. 2. What is the tension in the string between the blocks? Answer in units of N. 3. If ...
*Friday, February 21, 2014 at 8:09pm*

**Physics**

A block of mass 5.53 kg lies on a frictionless horizontal surface. The block is connected by a cord passing a. over a pulley to another block of mass 2.25 kg which hangs in the air. Assume the cord to be light (massless and weightless) and unstretchable and the the pulley to ...
*Friday, February 21, 2014 at 8:05pm*

**Physics**

a. An object has a mass of 33 kg. The acceleration of gravity is 9.8 m/ s^2. What is its weight on the earth? Answer in units of N. 2. What is its mass on the moon where the force of gravity is 1/6 that of the earth? Answer in units of kg. 3. What is the weight of that object ...
*Friday, February 21, 2014 at 8:01pm*

**Physics**

A dragster and driver together have mass 900.7 kg. The dragster, starting from rest, attains a speed of 25.7 m/s in 0.54 s. 1. Find the average acceleration of the dragster during this time interval. Answer in units of m/s^2. 2. What is the size of the average force on the ...
*Friday, February 21, 2014 at 7:59pm*

**Physics**

A skateboarder shoots off a ramp with a velocity of 5.7 m/s, directed at an angle of 58° above the horizontal. The end of the ramp is 1.3 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point ...
*Friday, February 21, 2014 at 6:59pm*

**Physics**

A volleyball is spiked so that it has an initial velocity of 15.6 m/s directed downward at an angle of 56.9 ° below the horizontal. What is the horizontal component of the ball's velocity when the opposing player fields the ball?
*Friday, February 21, 2014 at 6:52pm*

**Physics**

An airplane has a mass of 3.25 × 104 kg and takes off under the influence of a constant net force of 2.38 × 104 N. What is the net force that acts on the plane's 74.6-kg pilot?
*Friday, February 21, 2014 at 6:39pm*

**physics**

The distance between two telephone poles is 49 m. When a 1.6 kg bird lands on the telephone wire midway between the poles, the wire sags 0.149 m. The acceleration of gravity is 9.8 m/s2 . How much tension in the wire does the bird produce? Ignore the weight of the wire. Answer...
*Friday, February 21, 2014 at 6:17pm*

**Physics.**

From greatest to least, rank the accelerations of the boxes. C. <-5N--|3kg|--16N-> B. <-8N--|4kg|--16N-> A. <-4N--|5kg|--8N--> D. <-2N--|20kg|--20->
*Friday, February 21, 2014 at 6:08pm*

**Physics **

Two automobiles, each of mass 800kg , are moving at the same speed, 18m/s , when they collide and stick together. At what speed does the wreckage move if one car was driving north and one east.
*Friday, February 21, 2014 at 5:54pm*

**Physics **

An engineer needs to know how far a long beam will sag under a load. The table shows some results: LOAD(N): 1000 2000 3200 4400 5200 6500 SAG(cm): 2.0 4.0 6.6 8.8 10.4 13.4 a) one of the measurements for a sag is wrong. which? What should the result be? b)What would be the sag...
*Friday, February 21, 2014 at 4:39pm*

**physics!!**

A ball of mass m strikes a wall that is perpendicular to its path at speed +v and rebounds in the opposite direction with a speed –v. The impulse imparted to the ball by the wall is 1) 2mv 2)mv 3)-mv 4)zero 5)-2mv
*Friday, February 21, 2014 at 3:18pm*

**physics**

A ball of mass m strikes a wall that is perpendicular to its path at speed +v and rebounds in the opposite direction with a speed –v. The impulse imparted to the ball by the wall is
*Friday, February 21, 2014 at 3:17pm*

**Physics 2**

A beam of light is incident on a plane mirror at an angle of 35¨¬. If the mirror rotates through a small angle ¥è through what angle will the reflected ray rotate
*Friday, February 21, 2014 at 2:59pm*

**Physics 2**

An antenna is connected to a car battery. Will the antenna emit electromagnetic radiation? Why or why not? Explain where Amperes and Faradays law is concerned
*Friday, February 21, 2014 at 2:58pm*

**Physics**

Suppose the magnitude of the "drag force" acting on the falling object of mass m is Dv2. Find the expression for the magnitude of the terminal velocity of this object. (Use any variable or symbol stated above along with the following as necessary: g. Do not ...
*Friday, February 21, 2014 at 2:36pm*

**physics**

You are told that the linear "drag coefficient" due to air resistance for a particular object is 0.64 N · s/m and the object has a mass of 0.0010 kg. Find the magnitude of the terminal velocity of this object when dropped from rest. (Assume the object's ...
*Friday, February 21, 2014 at 2:35pm*

**Physics**

Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 26.5 cm) 15.1 cm away from an object. Find the image distance. Answer in units of cm
*Friday, February 21, 2014 at 2:26pm*

**physics**

A -kg block is initially at rest on a frictionless horizontal surface. It is pulled with a constant horizontal force N. How long must it be pulled before its speed is m/s? t_{pull} =
*Friday, February 21, 2014 at 1:17pm*

**physics**

A block with a mass of 126 kg is pulled with a horizontal fource of F_{applied} across a rough floor. The coefficent of friction between the floor and the block is 0.7. If the block is moving at a constant velocity, what is the magnitude of F_{applied}? F_{applied} =
*Friday, February 21, 2014 at 1:16pm*

**physics**

A 7 kg purse is dropped from the top of the Leaning Tower of Pisa and falls 53 m before reaching the ground with a speed of 17 m/s. What was the average force of air resistance? F_{average} =
*Friday, February 21, 2014 at 1:15pm*

**physics**

Drag-race tires in contact with an asphalt surface have a very high coefficient of static fric.tion. Assuming a constant acceleration and no slipping of tires, estimate the coefficient of static friction needed for a drag racer to cover 2.1 km in 8 s, starting from rest. ...
*Friday, February 21, 2014 at 1:14pm*

**physics**

What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the ground is 0.24? a_{max} =
*Friday, February 21, 2014 at 1:14pm*

**physics**

A force of 48 N is required to start a 7.8 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? \mu_s = (b) Does the coefficent of friction have a unit? A. No, it is a ratio B. No, the units are not ...
*Friday, February 21, 2014 at 1:13pm*

**physics**

Three blocks on a frictionless horizontal surface are in contact with each other. A force F is applied to block A and the blocks start to slide to the right of their initial position. Determine the acceleration of the system, if m_A = 12 kg, m_B = 38 kg, m_C = 4700 g, and F = ...
*Friday, February 21, 2014 at 1:12pm*

**Physics**

A single mass (m1 = 3.2 kg) hangs from a spring in a motionless elevator. The spring constant is k = 253 N/m. 1) What is the distance the spring is stretched from its unstretched length? This first answer is equal to 12.4 cm but I am having trouble on the second question... 2)...
*Friday, February 21, 2014 at 12:04pm*

**physics**

If a toy plane is spinning on a string 1.87 meters off the ground and the string is .5m long how long does it take to make 10 revolutions?
*Friday, February 21, 2014 at 11:04am*

**physics**

(a) A car with a mass of 950 kg is moving to the right with a constant speed of 1.45 m/s. What is the total force on the car? (b) What is the total force on the car if it is moving to the left?
*Friday, February 21, 2014 at 10:58am*

**physics**

A block weighing 71.5 N rests on a plane inclined at 24.1° to the horizontal. The coefficient of the static and kinetic frictions are 0.26 and 0.13 respectively. What is the minimum magnitude of the force F, parallel to the plane, that will prevent the block from slipping?
*Friday, February 21, 2014 at 9:59am*

**Physics**

An airplane with an airspeed of 50km/h lands on a runway where the wind speed is 30km/h .
*Friday, February 21, 2014 at 9:53am*

**Physics**

At the instant a race began, a 89.1 kg sprinter exerted a force of 710 N on the starting block in the direction 110 degrees measured clockwise from the positive x-axis. (a) What was the horizontal acceleration of the sprinter? a_x = (b) If the force was exerted for 0.7 s, ...
*Friday, February 21, 2014 at 2:12am*

**physics**

A person stands on a bathroom scale on a motionless elevator. When the elevator begins to move, the scale briefly reads 200 percent of the person's regular weight. Calculate the acceleration of the elevator, a_{elevator}. Use SI units
*Friday, February 21, 2014 at 2:07am*

**physics**

Two spheres are launched horizontally from a 0.8 m high table. Sphere A is launched with an initial speed of 16 m/s. Sphere B is launched with an initial speed of 8 m/s.
*Thursday, February 20, 2014 at 11:26pm*

**Physics**

A rifle shoots a 4.1g bullet out of it's barrel. The bullet has a muzzle velocity of 975 m/s just as it leaves the barrel. Assuming a constant horizontal acceleration over a distance of 43.0 cm starting from rest, with no friction between the bullet and the barrel, what ...
*Thursday, February 20, 2014 at 10:20pm*

**physics**

A 475 gram box is given a push and it then slides up and back down a ramp with a 35.0° incline. The coefficient of friction is 0.30. (a) Determine the rate of deceleration as the box slides up the ramp. (b) Determine the rate of acceleration as the box slides back down ...
*Thursday, February 20, 2014 at 9:45pm*

**physics**

Suppose two children push horizontally, but in exactly opposite directions, on a third child in a wagon. The first child exerts a force of 75.0 N, the second a force of 95.0 N, friction is 12.0 N, and the mass of the third child plus wagon is 21.0 kg. (c) Calculate the ...
*Thursday, February 20, 2014 at 8:33pm*

**Physics**

a 2.5 kg ball moving at 7.50 m/s is caught by a 70.0 kg man while the man is standing on ice. how fast will the man / ball combination be moving after the ball is caught by the man?
*Thursday, February 20, 2014 at 8:16pm*

**physics**

A 33.3- kg block (m1) is on a horizontal surface, connected to a 5.1- kg block (m2) by a massless string. The pulley is massless and frictionless. A force of 220.1 N acts on m1 at an angle of 32.p deg. The coefficient of kinetic friction between m1 and the surface is 0.201. ...
*Thursday, February 20, 2014 at 5:10pm*

**physics**

A 33.3- kg block (m1) is on a horizontal surface, connected to a 5.1- $kg$ block (m2) by a massless string. The pulley is massless and frictionless. A force of 220.1 N acts on m1 at an angle of 32.p deg. The coefficient of kinetic friction between m1 and the surface is 0.201. ...
*Thursday, February 20, 2014 at 5:09pm*

**physics**

A block weighing 71.5 N rests on a plane inclined at 24.1° to the horizontal. The coefficient of the static and kinetic frictions are 0.26 and 0.13 respectively. What is the minimum magnitude of the force F, parallel to the plane, that will prevent the block from slipping?
*Thursday, February 20, 2014 at 5:05pm*

**Physics **

A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 21.0° below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration ...
*Thursday, February 20, 2014 at 4:32pm*

**physics**

the distance from the earth to the sun is 1.5 times 10 to the 11 power m ( 93 million miles) and the time for one complete orbit of the earth about the sun is one year. how long would it take a planet located at twice this distance from the sun to complete one orbit?
*Thursday, February 20, 2014 at 3:54pm*

**Physics**

A ball is thrown upward in two dimensions with an initial speed of 17 Zlugs per mega handle(made up) near the surface of the planet earth. What will be the y component of the balls velocity at the peak of its trajectory?
*Thursday, February 20, 2014 at 2:07pm*

**Physics**

A 439g block is placed on a spring with a spring constant of 193N/m, compressing it 28cm. What height does the block reach when it is launched?
*Thursday, February 20, 2014 at 12:29pm*

**physics**

choose the correct answer and why? a car starts from rest and reaches speed of 80 km/h in 16 s the average acceleration of the car is: a\ 0.7 m/s*2 b\1.4 m/s*2 c\5 m/s*2
*Thursday, February 20, 2014 at 12:27pm*

**Physics**

A 14g bullet is traveling at 306m/s when it strikes a block of wood. If the block of wood exerts a force of 50,000 N opposing the motion of the bullet, how far will the bullet penetrate the block of wood?
*Thursday, February 20, 2014 at 12:24pm*

**Physics**

A uniform rope with length L and mass m is held at one end and whirled in a horizontal circle with angular velocity w. You can ignore the force of gravity on the rope. (a) At a point on the rope a distance r from the end that is held, what is the tension F? (b) What is the ...
*Thursday, February 20, 2014 at 12:22pm*

**physics**

If the cart weighs 8.7kg and the cart starts at a height of 3m, what is the final velocity of the cart? the starting velocity is 0
*Thursday, February 20, 2014 at 12:15pm*

**Physics**

A 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 25.0° with a speed of 30.0 m/s.The coefficient of static friction between the car and the road is 0.300. What is the force exerted by friction on the car?
*Thursday, February 20, 2014 at 6:22am*

**physics 2**

a certain 12v storage battery with an internal resistance of 12 ohms delivers 80 A when used to crank a gasoline engine. if the battery mass is 20 kg and it has average specific heat of 0.2 kcal/kg K. what is its rise in temperaure during 1 min of cranking the engine. assume ...
*Thursday, February 20, 2014 at 4:44am*

**Physics**

A train is moving parallel and adjacent to a highway with a constant speed of 27 m/s. Ini- tially a car is 29 m behind the train, traveling in the same direction as the train at 38 m/s and accelerating at 2 m/s2. What is the speed of the car just as it passes the train? Answer...
*Thursday, February 20, 2014 at 2:30am*

**Physics**

A student performs a ballistic pendulum experiment using an apparatus similar to that shown in the figure. Initially the bullet is fired at the block while the block is at rest (at its lowest swing point). After the bullet hits the block, the block rises to its highest ...
*Thursday, February 20, 2014 at 2:28am*

**physics**

A cart of mass m = 1.10 kg on a track undergoes a collision with another cart. It's velocity before and after the collision, vi and vf is measured and found to be vi = 2.12¡À0.06 m/s and vf = 0.60¡À0.08 m/s. Calculate the following quantities ...
*Wednesday, February 19, 2014 at 11:52pm*

**Physics**

A 30m high cylindrical water tank has a diameter of 14m. The tank is two-thirds full of water. What is the pressure at the bottom of the tank?
*Wednesday, February 19, 2014 at 11:49pm*

**Physics **

Find the net force and the acceleration for the situation below. 30N 20N <---------------[ 5.1kg]---------->
*Wednesday, February 19, 2014 at 11:44pm*

**Physics**

I only need help with part B. A 250W computer power supply is on 10 h per day. Part A If the cost of electricity is $0.15/kWh, what is the energy cost (to the nearest dollar) if this computer is used like this for a year (365 days)? 140 dollars Part B If this power supply is ...
*Wednesday, February 19, 2014 at 11:16pm*

**Physics**

A block of mass 21.0kg kg slides down a frictionless surface inclined at 33 ∘ ^\circ.To ensure that the block does not accelerate, what is the magnitude of the smallest force that you must exert on it?
*Wednesday, February 19, 2014 at 10:56pm*

**Physics**

A certain radioactive element has a half liv of 20days, how long does it take 3/2 of the atom originally present to disintegrate
*Wednesday, February 19, 2014 at 10:15pm*

**Physics **

You are general in the Napoleonic wars. You are on top of a plain 12m talk and you have a cannon tht can shoot a cannonball out at 350 m/s. 800 m away is a thick forest that you cannot see into but one of your scouts in a hot air balloon has just signaled to you that an enemy ...
*Wednesday, February 19, 2014 at 9:42pm*

**Physics **

You are a general in the Napoleonic wars. An enemy fort 10m tall is located 1000m from your cannon. Your cannon expert is insisting that you will get the best results at an angle of 25 above the horizontal. Your cannon is located on a hill 10m tall. You have soldiers storming ...
*Wednesday, February 19, 2014 at 9:36pm*

**Physics **

You are a general in the Napoleonic war. The battle has taken you to a trench 7m deep. You have a mortar that will fire an explosive at a speed of 200 m/s at an angle of 80. You have a low flying reconnaissance airplane scouting out the enemy troops at a height of 500 m. Your ...
*Wednesday, February 19, 2014 at 9:31pm*

**Physics**

Suppose you are a general in the Napoleonic wars. You are no top of a plain 50 m high overlooking the enemy soldiers. You now have a brand new cannon that will decimate the enemy. Unfortunately in the christening process you used some rather cheap grade champagne and all the ...
*Wednesday, February 19, 2014 at 9:27pm*

**Physics**

Two identical gliders slide toward each other on an air track. One moves at 2 m/s and the other at 1 m/s. If they stick together, the combination slides at? Why?
*Wednesday, February 19, 2014 at 9:24pm*

**Physics**

A ball is thrown upward in two dimensions with an initial speed of 17 Zlugs per mega handle(made up) near the surface of the planet earth. What will be the y component of the balls velocity at the peak of its trajectory?
*Wednesday, February 19, 2014 at 8:58pm*

**Physics**

A cannon shoots a cannonball with an initial speed of 25 m/s at an angle 13. 1. What is the x component of the cannonballs initial velocity Vox? 2. What is the y component of the cannonballs initial velocity Voy? 3. What will be Vy, the y component of the cannonballs final ...
*Wednesday, February 19, 2014 at 8:57pm*

**Physics**

A cannon fires a free projectile at an angle 85 from the ground. The cannonball has a speed of 150 m/s and it is launched from a hill 20 m above the plain where it will land 1. What is the x component of the cannonballs initial velocity 2. What is the y component of the ...
*Wednesday, February 19, 2014 at 8:56pm*

**Physics**

A. Consider the motion of a projectile. It is fired at t= 0. Its initial speed is 12 m/s and its initial projection angle is 50◦ from the horizontal. The acceleration of gravity is 9.8 m/s^2. What is the maximum height,h, of its trajectory? Answer in units of m. B. ...
*Wednesday, February 19, 2014 at 8:48pm*

**Physics**

A small rocket weighs 14.7 newtons. The rocket is fired from a high platform but it's engine fails to burn properly. The rocket gains total upward force if only 10.2 newtons. At what rate and in what direction is the rocket accelerated?
*Wednesday, February 19, 2014 at 8:41pm*

**Physics**

During a baseball game, a batter hits a pop-up to a fielder 78 m away. The acceleration of gravity is 9.8 m/s^2. If the ball remains in the air for 5.7 s, how high does it rise? Answer in units of m.
*Wednesday, February 19, 2014 at 8:37pm*

**Physics 101**

Consider two waterfalls, one twice the height of the other. The kinetic energy of each kilogram of water falling to the bottom of the taller waterfall is about?
*Wednesday, February 19, 2014 at 8:08pm*

**physics**

A 400 g marble block has a specific heat of 860 J/kg C deg. If the block is placed in 700 ml of water, the marble changes it temperature by 17 Celsius degrees. Since the specific heat of water is known to be 4186 J/kg C deg, what is the temperature change of the water. (The ...
*Wednesday, February 19, 2014 at 7:20pm*

**physics**

A wave travels at 575 m/sec in a dense media. The wave is observed to The length of the media is 95.8 cm. When the wave is reflected at the end, its phase is reversed (an upward motion becomes a downward motion.) What is the frequency of the resonant wave in this media?
*Wednesday, February 19, 2014 at 7:19pm*

**physics**

The speed of sound in air varies with the temperature and humidity of the air. In dry air at 20 degrees Celsius, the speed of sound is approximately 343 m/sec. A closed tube resonates with a node at each end for a sound wave in air. What is the length of tube you would choose ...
*Wednesday, February 19, 2014 at 7:19pm*

**Physics**

A 45kg block slides down an incline that is angled at 41 degrees. If the coefficient of kinetic friction between the block and the incline is 0.45 what is the block's acceleration?
*Wednesday, February 19, 2014 at 5:59pm*

**PHYSICS**

A girl rows 10 km downstream in 2 h. Her return trip takes 3 h. How fast is the current. in km/
*Wednesday, February 19, 2014 at 3:36pm*

**PHYSICS**

car traveling at 28.8 m/s hits a stone wall . The driver, who is wearing a shoulder harness and seat belt, moves forward 0.93 m as the car stops. Assuming his acceleration is uniform, find his average velocity during the collision. in m/S
*Wednesday, February 19, 2014 at 3:18pm*

**PHYSICS**

A girl rows 10 km downstream in 2 h. Her return trip takes 4 h. How fast can she row in still water. in km/h?
*Wednesday, February 19, 2014 at 3:08pm*

**PHYSICS**

Sun..BLANK....than moon. earth iS..BLANK... mercury.
*Wednesday, February 19, 2014 at 2:36pm*

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