Tuesday

May 31, 2016
**physics**

A mountain biker rides a given distance due north, then drives twice that far to the west. At the end of the trip the direct distance from the starting point is 112meters. What is the length of each leg of the trip and in which direction is the end point?
*Sunday, January 12, 2014 by Lily*

**Physics**

A bus slows down uniformly from 75 km/h to 15 km/h in 12.55 s. How far did the car travel before stopping?
*Sunday, January 12, 2014 by Sam*

**Physics**

Henry walks 20 km west forgot his coat, so he turns and heads 13 km east. He decided to go another path to make up for the lost time and travels 30 km south and then moves west for 27 km. Calculate Henry's displacement.
*Sunday, January 12, 2014 by Sam*

**physics**

A child and a sled have a combined mass of 87.5 kg slides down a friction-less hill that is 7.34 m high. If the sled starts from rest, what is the velocity of the sled at the bottom of the hill?
*Sunday, January 12, 2014 by Sam*

**Physics**

Three spiders are resting on the vertices of a triangular web. The sides of the triangular web have a length of a = 0.85 m, as depicted in the figure. Two of the spiders (S1 and S3) have +7.7 µC charge, while the other (S2) has −7.7 µC charge. a)What are the ...
*Sunday, January 12, 2014 by Jimmy*

**Physics **

Problem 3- A 10-g metal ball is moving to the left with a velocity of magnitude 0.4 m/s has a head-on, elastic collision with a larger 30-g metal ball moving to the right with a velocity of magnitude 0.2 m/s. a) Find the speed of the two balls after the collision. b) If the ...
*Sunday, January 12, 2014 by Mariam*

**Physics **

Problem 2- A 15 kg block is attached to a very light horizontal spring of force constant 400 N/m and is resting on a smooth horizontal table as shown in the figure below. Suddenly it is struck by a 3 kg stone traveling horizontally at 8 m/s to the right, whereupon the stone ...
*Sunday, January 12, 2014 by Mariam*

**Physics **

Problem 1- A 0.5 kg ball is moving to the right at 5 m/s when it is suddenly collide by a wall that exerts on it a horizontal force of 2.5 N for a period of 0.8 s. a) What is the impulse does the force of the wall exert on the ball? b) What is the velocity of the ball after ...
*Sunday, January 12, 2014 by Mariam*

**Physics**

Bees often work together for the greater good of the hive. Sometimes they can get excess charge on them. Four pairs of bees, which can be represented as identical, conducting spheres, bump into each other in the hive. Rank the bees in the order of the size of the magnitude of ...
*Sunday, January 12, 2014 by Jimmy*

**physics**

A small cube of mass m1= 2.0 kg slides down a circular and frictionless track of radius R= 0.6 m cut into a large block of mass m2= 5.0 kg as shown in the figure below. The large block rests on a horizontal and frictionless table. The cube and the block are initially at rest, ...
*Sunday, January 12, 2014 by Anonymous*

**physics Classical Mechanics**

A pendulum of mass m= 0.9 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum is measured from the ...
*Sunday, January 12, 2014 by Anonimus*

**PHYSICS(HELP)**

In the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a non-linear way, especially at high altitude. To a...
*Sunday, January 12, 2014 by Anonimus*

**PHYSICS(HELP)**

A small block of mass m=1 kg glides down (without friction) a circular track of radius R=2 m, starting from rest at height R. At the bottom of the track it hits a massless relaxed spring with spring constant k= 11 N/m, which starts to be compressed as the block continues to ...
*Sunday, January 12, 2014 by Anonymous*

**physics**

A pelican ﬂying along a horizontal path drops a ﬁsh from a height of 4.3 m. The ﬁsh travels 8.3 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
*Saturday, January 11, 2014 by sabrina*

**Physics **

A train traveling at a speed of 110 km/h uniformly decelerates for 20 seconds. During that time it travels 450m. A) What is the acceleration? (m/s^2) B) What is its speed after deceleration? (km/h) A ANS = -.805m/s^2 B ANS = 52km s = 450m t = 20 seconds u = 110km/h*1000m/km /...
*Saturday, January 11, 2014 by Danny*

**Physics**

Two uniform solid spheres have the same mass of 3 kg, but one has a radius of 0.25 m while the other has a radius of 0.8 m. Each can rotate about an axis through its center. (a) What is the magnitude τ of the torque required to bring the smaller sphere from rest to an ...
*Saturday, January 11, 2014 by Josh*

**PHYSICS(HELP)**

A pendulum of mass m= 0.8 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum is measured from the ...
*Saturday, January 11, 2014 by Anonymous*

**physics**

Pls help me with this, The resistance of a platinum resistance thermometer is 30 ohms at the ice point, 40 ohms at the steam point and 34.5 ohms on a certain hot day, what is the temperature of the day on celcius temperature day?
*Saturday, January 11, 2014 by dayo*

**Physics Please check my answer**

Okay, so I've figured this much out on my own, I just need help with the next part. It's a two block system with a friction of .20 a hanging mass of 7.5 kg and mass on the table at 10 kg. I got 3.08 m/s^2 for the acceleration and I got 22.8 N for the tension in the ...
*Saturday, January 11, 2014 by unknown*

**Physics**

The gravitational force of attraction between two students sitting at their desks in physics class is 2.35 ✕ 10-8 N. If one student has a mass of 46.2 kg and the other student has a mass of 62.6 kg, how far apart are the students sitting?
*Saturday, January 11, 2014 by Anonymous*

**Physics**

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 11.6 m long. His speed at the bottom of the swing is 7.4 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that Tarzan can have ...
*Saturday, January 11, 2014 by Anonymous*

**physics**

Under what circumstances does a double convex lens produce an image that is reversed left to right?
*Saturday, January 11, 2014 by Lane*

**Physics Please check my answer**

1. Which of the following are conserved in a totally inelastic collision? Only momentum Only kinetic energy Both momentum and kinetic energy Neither momentum nor kinetic energy <--- It depends on the objects. 2. Two skaters stand face to face. Skater 1 has a mass of 55 kg, ...
*Saturday, January 11, 2014 by unknown*

**physics**

The resistance of a platinum resistance thermometer is 30 ohms at the ice point, 40 ohms at the steam point and 34.5 ohms on a certain hot day, what is the temperature of the day on celcius temperature day?
*Saturday, January 11, 2014 by dayo*

**physics**

The resistance of a platinum resistance thermometer is 30 ohms at the ice point, 40 ohms at the steam point and 34.5 ohms on a certain hot day, what is the temperature of the day on celcius temperature day?
*Saturday, January 11, 2014 by dayo*

**Physics**

dT/dz=−α for z≤11 km where α=6.5 K/km (Kelvin per km) and z is the height above the sea level. The temperature stays then approximately constant between 11 km and 20 km above sea level. Assume a temperature of 5 ∘C and a pressure of 1 atm at sea ...
*Saturday, January 11, 2014 by Anonymous*

**PHYSICS**

dT/dz=−α for z≤11 km where α=6.5 K/km (Kelvin per km) and z is the height above the sea level. The temperature stays then approximately constant between 11 km and 20 km above sea level. Assume a temperature of 5 ∘C and a pressure of 1 atm at sea ...
*Saturday, January 11, 2014 by Anonymous*

**physics**

A small cube of mass m1= 1.0 kg slides down a circular and frictionless track of radius R= 0.4 m cut into a large block of mass m2= 4.0 kg as shown in the figure below. The large block rests on a horizontal and frictionless table. The cube and the block are initially at rest, ...
*Saturday, January 11, 2014 by Garry*

**physics**

A hunter with a gun of maximum range 200 meters tries to shoot a leopard sitting in a tree. The tree is at a distance of 100 m from the hunter and the leopard is sitting at a height of 2 m from the ground. In order to be able to hit the leopard
*Friday, January 10, 2014 by afrasiab*

**physics**

8. A spring is compressed a distance of 0.15 m from its rest position and held in place while a ball of mass 0.150 kg is placed at its end. When the spring is released, the ball leaves the spring traveling at 9.0 m/s. What is the spring constant? 540 N/m 450 N/m 60 N/m 225 N/m...
*Friday, January 10, 2014 by unknown*

**Physics help**

I'm trying to calculate the tension in a rope. The two ropes are holding up a picture frame that is 100N, each rope is at a 45 degree angle. I'm trying to find the value of the tension of the 1st rope. Please help
*Friday, January 10, 2014 by unknown*

**physics help**

A pendulum of mass m= 0.8 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum is measured from the ...
*Friday, January 10, 2014 by Anonymous*

**PHYSICS(HELP!!!!!!!)**

dT/dz=−α forz≤11 km where α=6.5 K/km (Kelvin per km) and z is the height above the sea level. The temperature stays then approximately constant between 11 km and 20 km above sea level. Assume a temperature of 5 ∘C and a pressure of 1 atm at sea ...
*Friday, January 10, 2014 by Anonymous*

**PHYSICS URGENT **

dT/dz=−α forz≤11 km where α=6.5 K/km (Kelvin per km) and z is the height above the sea level. The temperature stays then approximately constant between 11 km and 20 km above sea level. Assume a temperature of 5 ∘C and a pressure of 1 atm at sea ...
*Friday, January 10, 2014 by Anonymous*

**PHYSICS(HELP)**

dT/dz=−α forz≤11 km where α=6.5 K/km (Kelvin per km) and z is the height above the sea level. The temperature stays then approximately constant between 11 km and 20 km above sea level. Assume a temperature of 5 ∘C and a pressure of 1 atm at sea ...
*Friday, January 10, 2014 by Anonymous*

**physics**

A satellite is placed in orbit 100 km above the surface of the earth (radius = 6370 km, mass = 5.98 x 1024 kg). What is the value of the acceleration of gravity at that altitude as a percentage of the acceleration at the surface of the earth?
*Friday, January 10, 2014 by Lisa *

**Physics Please check my answer**

How much work is done by the centripetal force (in this case, the friction between the tires and the road) on a 1200 kg car moving on a circular track of radius 50 meters at a constant speed of 31.4 m/s? A. 7.4 • 10^6 J B. 19.7 J <--- C. 2136.7 J D. 117,600 J E. 0 J
*Friday, January 10, 2014 by Lisa *

**Physics**

A billiard ball traveling at 6.25 m/s collides with a second stationary ball of equal size and shape causing the second ball to move at an angle of 25º with respect to the horizontal at a speed of 3.0 m/s.Both balls have a mass of .210kg. What is the impulse of both balls...
*Friday, January 10, 2014 by Lisa *

**PHYSICS(HELP)**

dTdz=−α forz≤11 km where α=6.5 K/km (Kelvin per km) and z is the height above the sea level. The temperature stays then approximately constant between 11 km and 20 km above sea level. Assume a temperature of 5 ∘C and a pressure of 1 atm at sea level...
*Friday, January 10, 2014 by Anonymous*

**physics help**

A pendulum of mass m= 0.8 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum is measured from the ...
*Friday, January 10, 2014 by Anonymous*

**PHYSICS(help)**

A small block of mass m=1 kg glides down (without friction) a circular track of radius R=2 m, starting from rest at height R. At the bottom of the track it hits a massless relaxed spring with spring constant k= 11 N/m, which starts to be compressed as the block continues to ...
*Friday, January 10, 2014 by Anonymous*

**Physics**

diagram: big triangle mass m with the square angle bottom left and angle theta bottom right.no frition with the horizontal surface. Above that triangle a similar triangle mass m with a shorter hypothenuse (square angle top right, angle theta top left, no friction between both...
*Friday, January 10, 2014 by Anonymous*

**integrated physics and chem**

Element A and element B have bonded and formed compound AB. Which of the following statements is true? A. Compound AB has chemical and physical properties that are completely different from those of A and B. B. Compound AB has chemical and physical properties that are a blend ...
*Friday, January 10, 2014 by Anonymous*

**physics**

A gunman standing on a sloping ground fires up the slope. The initial speed of the bullet is v0= 390 m/s. The slope has an angle α= 19 degrees from the horizontal, and the gun points at an angle θ from the horizontal. The gravitational acceleration is g=10 m/s2. (a) ...
*Friday, January 10, 2014 by JuanPro*

**Physics**

A uniform rod of mass M and length d is initially at rest on a horizontal and frictionless table contained in the xy plane, the plane of the screen. The figure is a top view, gravity points into the screen. The rod is free to rotate about an axis perpendicular to the plane and...
*Friday, January 10, 2014 by Anonymous*

**Physics Classical Mechanics Help ASAP**

A small cube of mass m1= 1.0 kg slides down a circular and frictionless track of radius R= 0.6 m cut into a large block of mass m2= 4.0 kg as shown in the figure below. The large block rests on a horizontal and frictionless table. The cube and the block are initially at rest, ...
*Friday, January 10, 2014 by Anonymous*

**Physics Classical Mechanics Help ASAP**

A small block of mass m=1 kg glides down (without friction) a circular track of radius R=2 m, starting from rest at height R. At the bottom of the track it hits a massless relaxed spring with spring constant k= 8 N/m, which starts to be compressed as the block continues to ...
*Friday, January 10, 2014 by Anonymous*

**Physics Classical Mechanics Help ASAP**

A pendulum of mass m= 0.8 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum is measured from the ...
*Friday, January 10, 2014 by Anonymous*

**Physics Classical Mechanics Help ASAP**

In the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a non-linear way, especially at high altitude. To a...
*Friday, January 10, 2014 by Anonymous*

**Physics Classical Mechanics Help ASAP**

A gunman standing on a sloping ground fires up the slope. The initial speed of the bullet is v0= 390 m/s. The slope has an angle α= 25 degrees from the horizontal, and the gun points at an angle θ from the horizontal. The gravitational acceleration is g=10 m/s2. (a) ...
*Friday, January 10, 2014 by Anonymous*

**physics**

An 70 kg man drops from rest on a diving board −2.9 m above the surface of the water and comes to rest 0.58 s after reaching the water. The acceleration due to gravity is 9.81 m/s 2 . What force does the water exert on the man? Answer in units of N
*Friday, January 10, 2014 by allioe*

**Physics**

A 1.08 kg skateboard is coasting along the pavement at a speed of 5.30 m/s when a 1.05 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination?
*Thursday, January 9, 2014 by Daijha*

**Physics**

Two carts with masses of 4.82 kg and 2.72 kg move toward each other on a frictionless track with speeds of 5.03 m/s and 3.52 m/s respectively. The carts stick together after colliding head-on. Find the final speed.
*Thursday, January 9, 2014 by Daijha*

**physics**

A 15.0 kg dart is thrown horizontally into a dartboard. The thrower applies a 80.0 N force over a distance of 88.2 cm in order to propel the dart. a) Calculate the work done by the dart thrower. b) Determine the velocity of the dart. c) If the dart went 4.50 cm into the ...
*Thursday, January 9, 2014 by Alice*

**Physics forces unit**

I was wondering, how I would find the ratio of force to acceleration? I am doing an assignment where i had to find the force applied and the measured acceleration but I don't know how to find the ratio of force to acceleration. Thanks in advance!
*Thursday, January 9, 2014 by Diane*

**Physics -- URGENT**

Estimate the force a person must exert on a string attached to a 0.200 kg ball to make the ball revolve in a circle when the length of the string is 0.600 m. The ball makes 1.40 revolutions per second. Do not ignore the weight of the ball. In particular, find the magnitude of ...
*Wednesday, January 8, 2014 by Robert*

**Physics**

A 26.2 g marble sliding to the right at 62.0 cm/s overtakes and collides elastically with a 13.1 g marble moving in the same direction at 15.5 cm/s. After the collision, the 13.1 g marble moves to the right at 77.5 cm/s. Find the velocity of the 26.2 g marble after the ...
*Wednesday, January 8, 2014 by D*

**physics**

An 87.0 kg fullback moving east with a speed of 5.0 m/s is tackled by a 83.0 kg opponent running west at 2.92 m/s, and the collision is perfectly inelastic.
*Wednesday, January 8, 2014 by Daijha*

**Physics**

Estimate the force a person must exert on a string attached to a 0.200 kg ball to make the ball revolve in a circle when the length of the string is 0.600 m. The ball makes 1.40 revolutions per second. Do not ignore the weight of the ball. In particular, find the magnitude of ...
*Wednesday, January 8, 2014 by John*

**physics**

A bomb is dropped from a plane flying at constant horizontal velocity at an altitude of 600m. Where is the bomb after 2 sec? 5 sec? 10 sec? what are the velocities said period?
*Wednesday, January 8, 2014 by Anonymous*

**physics**

A bullet fired from a gun vertically upward with a muzzle velocity of 500 m/s. A) How long is the highest point reached? B) How long does it take the bullet to reach the ground after it is fired?
*Wednesday, January 8, 2014 by Anonymous*

**physics**

A bullet fired from a gun vertically upward with a muzzle velocity of 500 m/s. A) How long is the highest point reached? B) How long does it take the bullet to reach the ground after it is fired?
*Wednesday, January 8, 2014 by Anonymous*

**physics**

A bullet fired from a gun vertically upward with a muzzle velocity of 500 m/s. A) How long is the highest point reached? B) How long does it take the bullet to reach the ground after it is fired?
*Wednesday, January 8, 2014 by Anonymous*

**physics**

A bomb is dropped from a plane flying at constant horizontal velocity at an altitude of 600m. Where is the bomb after 2 sec? 5 sec? 10 sec? what are the velocities said period?
*Wednesday, January 8, 2014 by Anonymous*

**Science check answers please and quickly**

1. Jim is doing a physics experiment on the rate of cooling of solid objects in air. Which of the following is a variable that is not directly part of his experiment, but should be controlled in his experiment? (Points : 1) initial temperature to which he heats the solid ...
*Wednesday, January 8, 2014 by Greg*

**physics**

a brass cube of size 10cm is heated through 30 degree. if the linear expansivity of brass is 2.0*10^-5 k^-1. what is the increase in its volume?
*Wednesday, January 8, 2014 by shegster*

**Science check my answer please**

In a famous letter to Robert Hooke, Isaac Newton wrote, "If I have seen further it is only by standing on the shoulders of giants." Which of the following does this quote best demonstrate? (Points : 1) the cumulative nature of modern knowledge of physics how ...
*Wednesday, January 8, 2014 by Anonymous*

**Physics**

In a vacuum, two particles have charges of q1 and q2, where q1 = +3.7 µC. They are separated by a distance of 0.22 m, and particle 1 experiences an attractive force of 3.5 N. What is q2 (magnitude and sign)?
*Wednesday, January 8, 2014 by Dee*

**Physics**

Consider the static equilibrium diagram below. What is the net force acting along the positive x-axis?
*Tuesday, January 7, 2014 by Donald*

**physics **

The minute hand of a large clock is 0.50 m long. (A) Calculate its linear speed at its tip in meters per second. (0.000873 m/s) (B) Calculate the centripetal acceleration of the tip of the hand. (1.52 x 10-6 m/s2)
*Tuesday, January 7, 2014 by Steffine *

**Physics**

A log floating on the water bobs up and down a total of 7 times during a 10 second interval. What is the frequency of the water waves?
*Tuesday, January 7, 2014 by Sandara *

**Physics**

A firefighter of mass 73 kg slides down a vertical pole with an acceleration of 5 m/s2. The acceleration of gravity is 10m/s2. What is the friction foce that acts on him? Answer in units of N
*Tuesday, January 7, 2014 by AJ *

**physics**

A body of mass 1 kg and velovity 10 m/s collides with another body if mass 3 kg and velocity 2 m/s comming from the exactly opposite direction. if on collision the body's much into one find the magnitude and direction of common velocity
*Tuesday, January 7, 2014 by Shraddha*

**Physics **

A speaker moves a solid cone up and down to compress air making sounds waves at a frequency of 135 Hz. How long does it take for the cone to travel from it's lowest and highest points
*Tuesday, January 7, 2014 by Sandara *

**Physics**

Humans can hear sound frequencies ranging from about 20-20000 Hz. What is the shortest wavelength humans can hear (assuming sound travels at 343m/s)
*Tuesday, January 7, 2014 by Sandara *

**physics**

A spiral spring of natural length of 30.0cm and a constant force of 20N/m is compressed to 20cm. Calculate the energy stored in the spring.
*Tuesday, January 7, 2014 by emmanuel*

**physics**

A spiral spring of natural length of 30.0cm and a constant force of 20N/m is compressed to 20cm. Calculate the energy stored in the spring.
*Tuesday, January 7, 2014 by emmanuel*

**physics**

We hang a mass of 500kg on a cylindrical steel rod of radius 0.5 cm and length 1 m. How much will the rod stretch? Young's modulus: steel 12*10^10 N/m^2. Now change steel to nylon. How much will it stretch? Nylon: 0.36*10^10 N/m^2. Thanks.
*Tuesday, January 7, 2014 by alice*

**Physics-forces**

1. Salim has a paper route. He puts his papers on a toboggan to pull them through the snow. The combined mass of the papers and the toboggan is 24kg. The coefficient of static friction between the toboggagn and the snow is 0.18. The coeefficient of kinetic friction between the...
*Tuesday, January 7, 2014 by Jessie*

**Physics help quick!**

22. What does it mean for a force to act in accordance with an inverse square law? The square of the force is inversely proportional to the distance. The force decreases if the distance increases. The force is directly proportional to 1/r2 where r is the distance. The force is...
*Tuesday, January 7, 2014 by Anonymous*

**physics**

A Mini Cooper can accelerate from 0.0 mph to 90 mph in 8.82 seconds. How far does the car travel during the acceleration period?
*Tuesday, January 7, 2014 by Brook*

**physics**

A Mini Cooper can accelerate from 0.0 mph to 90 mph in 8.82 seconds. How far does the car travel during the acceleration period?
*Tuesday, January 7, 2014 by Brook*

**physics**

The spring balance is calibrated in newtons. State how the mass of the rock sample may be found from the reading of the spring balance
*Tuesday, January 7, 2014 by rida*

**physics**

calculate the refractive index of glass.
*Tuesday, January 7, 2014 by rida*

**physics**

The air in the syringe is at a pressure of 2.0×105Pa. The piston is slowly moved into the syringe, keeping the temperature constant, until the volume of the air is reduced from 80 cm3 to 25 cm3. Calculate the final pressure of the air.
*Tuesday, January 7, 2014 by rida*

**physics**

3 Fig. 3.1 shows the arm of a crane when it is lifting a heavy box. Fig. 3.1 (a) By the use of a scale diagram (not calculation) of the forces acting at P, find the weight of the box. [5]
*Tuesday, January 7, 2014 by rida*

**physics**

a body of mass 25kg moving at 3m/s on a rough horizontal floor is brought to rest after sliding through a distance of 2.5m on the floor. calculate the coefficient of sliding friction.
*Tuesday, January 7, 2014 by emmanuel*

**physics**

with a velocity of 2.3 m/s at an angle of 110 degrees to the board. at what horizontal distance from the end of the board will the diver enter the water?
*Monday, January 6, 2014 by devi*

**physics-forces**

1. Salim has a paper route. He puts his papers on a toboggan to pull them through the snow. The combined mass of the papers and the toboggan is 24kg. The coefficient of static friction between the toboggagn and the snow is 0.18. The coeefficient of kinetic friction between the...
*Monday, January 6, 2014 by Jessie*

**physics-forces**

1. a fully loaded rocket has a mass of 2.92x10^6kg. It's engines has a thrust of 3.34x10^7N a)what is the downward force of gravity of the rocket at blast off? b)what is the unbalanced force on the rocket at blast off? c)what is the accleration of the rocket as it leaves ...
*Monday, January 6, 2014 by Jessie*

**physics**

A car moving at 50 km/h skids 15 m with locked brakes. Show that a car moving at 150 km/h will skid 135 m with locked brakes. (Hint: The force doing work during the skidding is the same for both speeds. Use the work–energy theorem.)
*Monday, January 6, 2014 by jeremy steadman*

**Physics**

A bullet (m = 0.0250 kg) is fired with a speed of 92.00 m/s and hits a block (M = 2.50 kg) supported by two light strings as shown, stopping quickly. Find the height to which the block rises. Find the angle (in degrees) through which the block rises, if the strings are 0.540 m...
*Monday, January 6, 2014 by Ron*

**physics**

A 3kg basketball is dropped from the top of a 120m building. if all of the energy is converted into KE, what is the velocity of the ball just before it hits the ground
*Monday, January 6, 2014 by ShaSha*

**physics**

A power plant burns coal and generates an average of 600.0 Megawatts (MW) of electrical power while discharging 900.00 MW as waste heat. Find the total electrical energy generated by the plant in a 30-day period. Coals vary a lot in their energy content. The energy released by...
*Monday, January 6, 2014 by Nika*

**Physics-forces**

1. Harry is pushing a car down a level road at 2.0m/s with a force of 243N. The total force acting on the car in the opposite direction, including road friction and air resistance, is which of the following? a) slightly more than 243N b) exactly equal to 243N c) slightly less ...
*Monday, January 6, 2014 by Jessie*

**physics**

What is the ratio of the spin angular momentum of the earth and its orbital angular momentum about the sun. The mean radius of the earth is R=6400km. The radius of the earth's orbit is r=1.5*10^8km. You may assume the mass of the earth is uniformly distributed throughout ...
*Monday, January 6, 2014 by alice*

**Physics**

A car (m = 670.0 kg) accelerates uniformly from rest up an inclined road which rises uniformly, to a height, h = 35.0 m. Find the average power the engine must deliver to reach a speed of 23.9 m/s at the top of the hill in 22.7 s(NEGLECT frictional losses: air and rolling, ...)
*Monday, January 6, 2014 by Jim*

**Physics**

A power plant burns coal and generates an average of 630.0 MW of electrical power while discharging 1058.40 MW as waste heat. Find the total electrical energy generated by the plant in a 30-day period.
*Monday, January 6, 2014 by Nika*

**Physics 212**

Two copper wires have equal lengths, but the diameter of one is three times that of the other. a) The resistance of the thinner wire is _____ times that of the thicker wire: (Prove your work) 1) 3 2) 1/3 3) 9 4) 1/4
*Monday, January 6, 2014 by Marcu*

**Physics**

Two balls of different masses are set at a height of 3 m above the ground on a frictionless table. The ball on the left is of mass 2M and the ball on the right has a mass of 3M. They both are released simultaneously and slide onto the part of the table 2 m above the ground. ...
*Monday, January 6, 2014 by Irish*