Thursday

August 25, 2016
**Physics**

The radius of the earth's orbit around the sun (assumed to be circular) is 1.50 X 108 km, and the earth travels around this orbit in 365 days. (a) What is the magnitude of the orbital velocity of the earth, in m/s? (b) What is the radial acceleration of the earth toward ...
*Monday, December 28, 2015 by Edge*

**physics**

what is the potential energy of 4 point charges each of value Q at the corners of a square of side length a.
*Monday, December 28, 2015 by ruth*

**physics**

three forces of 10N,30N and 50N act at a point at 120° to each other.Find their resultant.
*Monday, December 28, 2015 by Anonymous*

**Physics**

an athlete leaves one end of a pool pf length l at t=0 and arrives at the other end at the time t1. she swim back and arrived at the starting position at the time t2. if she is swimming initially in the position x direction. determine her average velocities symbolically in (a...
*Monday, December 28, 2015 by Rea*

**PHYSICS**

TWO FORCES F1 AND F2 ARE ACTING AT RIGHT ANGLE TO EACH OTHER FIND THE EXPRESSION FOR THE RESULTANT FORCE?
*Monday, December 28, 2015 by Anonymous*

**physics **

A 5-kg motorbike moving at 10m/s to the left collides with 6-kg motorbike moving at 12m/s to the right. the two bikes stick together after they collide. find the final speed of the composite objects and the kinetic energy dissipated in the collision.
*Sunday, December 27, 2015 by Musa*

**physics**

find the linear speed of each point 2cm and 15cm from the axis of phonograph record rotating at 33 an 1/3 rev/min
*Sunday, December 27, 2015 by Musa*

**Physics college**

A particle is thrown from the origin of the frame xOy at the moment t = 0, with speed v0 at a certain angle b from the Ox axis. At the same moment another particle begins to fall freely from a wall with height h, situated at the distance d. Air resistance is neglected. Find ...
*Sunday, December 27, 2015 by Daniel*

**Physics help**

Find the differential equation of motion for a gravitational pendulum of mass m and length a by using the fact that the torque of its weight relative to the point of suspension is equal to the time derivative its angular momentum. Solve this equation to obtain the equation of ...
*Sunday, December 27, 2015 by Daniel*

**Physics**

A particle of mass m1 experiences a perfectly elastic collision with a particle of mass m2 at rest. What fraction of the incident energy does the incident particle lose if a) it recoils at right angle to the original direction and b) the collision is head-on?
*Sunday, December 27, 2015 by Cosmin*

**Physics**

The intensity of sound is x W/m2 at a distance of 5 m from the source. What is the intensity of the sound at a distance of 20 m from the source? I am not sure how to do this problem. Thank you for your help!
*Saturday, December 26, 2015 by Ellie*

**physics**

A soccer ball is kicked from the ground with initial speed 17 m/s at angle 20 0 find a) The horizontal distance that the ball travels after 4 s ? b) The speed of the ball at the highest point ?
*Saturday, December 26, 2015 by adim*

**physics**

A soccer ball is kicked from the ground with initial speed 17 m/s. at angle(a 20 Find a) The horizontal distance that the ball travels after 4s? b) The speed of the ball at the highest point?
*Saturday, December 26, 2015 by ahmed*

** physics**

A horse pulls a boat along a canal by a rope at an angle of 60° to the bank. He produces a tension of 1500N in the string. The boat moves through a distance of 30m. Find the amount of work done by horse?
*Saturday, December 26, 2015 by jyotirmay Kapil*

**physics**

An hydraulic press has an input cylinder of 2cm diameter and an output cylinder of 6cm diameter. Find the force exerted by the output piston when a force of 20N is applied to the input piston.
*Saturday, December 26, 2015 by trust*

**physics**

It takes 2.75s for the rock to hit the water at 54.45mph, how high is the bridge?
*Friday, December 25, 2015 by John*

**physics**

The descending pulley has a radius R and mass M.Find the acceleration of block of mass m placed, on the smooth surface and connected with another light pulley.
*Friday, December 25, 2015 by riya*

**physics**

the descending pulley has a radius R and mass M.find the acceleration of block of mass m placed, on the smooth surface and connected with another light pulley
*Friday, December 25, 2015 by riya*

**physics**

A car traveled 1000 kilometers from krui to Jakarta in 15 hours. What was its average velocity?
*Friday, December 25, 2015 by daim*

**physics**

How would you explain this in 100 or so words so I can get a full comprehension of the question? Much appreciated! Please help me: discuss whether or not it is possible for an object to be increasing in speed as its acceleration is decreasing. For either position you take, use...
*Wednesday, December 23, 2015 by Emily*

**Physics**

An astronaut is stranded on another planet with UNKNOWN GRAVITY. He conducts two experiments. In the first, he drops a rock from a cliff and he finds that it takes the rock 4.15 seconds to reach the ground at the base of the cliff. In the second experiment, he throws the rock ...
*Wednesday, December 23, 2015 by Emily*

**physics 1**

An astronaut is stranded on another planet with UNKNOWN GRAVITY. He conducts two experiments. In the first, he drops a rock from a cliff and he finds that it takes the rock 4.15 seconds to reach the ground at the base of the cliff. In the second experiment, he throws the rock ...
*Wednesday, December 23, 2015 by Emily*

**physics **

Two cyclists start out on the same trail together that is overall 20km long. The first cyclist completes the entire trail and is traveling at a constant 20 km/hr for the away part of the trip and then only 15 km/hr for the return trip. the Second cyclist, who is slower, is ...
*Wednesday, December 23, 2015 by Anon*

**Physics **

I'm not sure of where to begin with this question? completely lost Two cyclists start out on the same trail together that is overall 20km long. The first cyclist completes the entire trail and is traveling at a constant 20 km/hr for the away part of the trip and then only ...
*Wednesday, December 23, 2015 by Anonymous *

**physics **

Question 1) A rock is dropped from the top of a 100 meter tall cliff. A. ) How long will it take for the rock to reach the ground. B) What will be the velocity of the rock when it hits the ground? C) How long will it take for the rock to reach the ground if the rock is thrown ...
*Wednesday, December 23, 2015 by Anon*

**Physics **

The driver of a car is going 30 m/s slams on his brakes, the car's tires lock, and the car skids to a stop on a level roadway. The kinetic coefficient of friction between its tires and the pavement is 0.75 as it slides. Draw a free body diagram of the car, find its ...
*Tuesday, December 22, 2015 by Katie*

**physics**

a side view of a car tire before it is mounted on a wheel. Model it as having two sidewalls of uniform thickness 0.695 cm and a tread wall of uniform thickness 2.50 cm and width 23.2 cm. Assume the rubber has a uniform density 1.10 103 kg/m3. Find its moment of inertia about ...
*Tuesday, December 22, 2015 by Aaron*

**physics**

1. A car travels from one point to another point that is 4km to the east of its original position and then back to its original position in 22 minutes. What will be the car's average speed? What will be the car's average velocity? 3.) A truck is moving with a velocity ...
*Tuesday, December 22, 2015 by Anon*

**Physics**

Two resistors 3 Ω and 6 Ω are connected in parallel across a 6 V battery. What is the current flow through the 3 Ω resistor? 6 A 3 A 4 A 2 A
*Monday, December 21, 2015 by James*

**Physics**

1. A steam engine converts 150 kg of water completely to steam. The process involves transfer of 4 x 10^8 J as heat. If steam escaping through the safety valve does 2 x 10^8 J of work against outside atmosphere, the net change in the internal energy is: a. 2 J b. 2 x 108 J c. ...
*Monday, December 21, 2015 by Isabella*

**physics**

a spring of force constant 1500N/m is acted upon Hy a constant force of 75N .calculate the potential energy stored in the spring
*Monday, December 21, 2015 by Daniel*

**physics**

A block of mass 3kg which is on a smooth inclined plane making an angle of 30Â° to the horizontal is connected by a cord passing over a light frictionless pulley to a second block of mass 2kg hanging vertically. What is the acceleration of each block and what is the ...
*Monday, December 21, 2015 by swati*

**physics**

A tortoise and a hare are having a 1000-meter race. The tortoise runs the race at a constant speed of 2.30 cm/s. The hare moves at an average speed of 1.50 m/s for 10.0 minutes and then decides to take a nap. After waking up from the nap, the hare recognizes that the tortoise ...
*Monday, December 21, 2015 by Dina*

**Physics**

When does the potential difference between the two terminals of the battery be zero? I think it will be zero if the battery is consumed entirely or when the circuit is open. I thought a lot but have no good answer, please help
*Monday, December 21, 2015 by Asmaa khalaf*

**SCIENCE PHYSICS**

WHEN a body hanging from a spring balance is immersed in water it floats just below the surface of water and shows 100 g loss in its weight then what is the weight of the body in water,in air,what is upthrust on the body what is the volume of tne body.
*Sunday, December 20, 2015 by Junaid Shaikh*

**physics 1**

Problem 1) I don't understand how they got the answers for A) and B) : Ima Rushin can travel from Milwaukee Avenue to the school entrance gate at a constant speed of 22.5 m/s when the lights are green and there is no traffic. On Wednesday, Ima is stopped by a red light at ...
*Sunday, December 20, 2015 by Dina*

**physics**

M1.) Nguyen jumps off a cliff with a height of 100 meters at a velocity of 3.5 meters per second to a save a cat. How long will it take her to reach the surface of the ocean? A3.) A plane vertically flees a horde of zombies at a speed of 7.9 m/s at a height of 230m above the ...
*Sunday, December 20, 2015 by Emma*

**Physics**

1. A steam engine converts 150 kg of water completely to steam. The process involves transfer of 4 x 10^8 J as heat. If steam escaping through the safety valve does 2 x 10^8 J of work against outside atmosphere, the net change in the internal energy is: a. 2 J b. 2 x 108 J c. ...
*Sunday, December 20, 2015 by Helen *

**Physics- Help!!**

1. What is the heat required in kilocalories to convert 2 kg of ice at 0°C completely into steam at 100°C? (I thought it was 2000 kilo cals but I think I'm wrong??) a. 80 Calories b. 1440 Calories c. 4186 Calories d. 540 Calories 2. A gaseous refrigerant undergoes ...
*Sunday, December 20, 2015 by Elena*

**Physics projectile motion**

A football player kicks a ball with a soeed of 22.4 m/s at an angle of 49 degrees above the horizontal from a distance of 39.0 m from the goal post, A). By how much does the ball clear or fall short of clearing the crossbar of the goalpost if the that bar is 3.05 m high? B). ...
*Sunday, December 20, 2015 by Khalid*

**physics**

4. Let's say you're driving in your car, approaching a red light on the Camp Hill Bypass. A black Porsche is stopped at the light in the right lane, but there's no-one in the left lane, so you pull into the left lane. You're traveling at 40 km/hr, and when you...
*Sunday, December 20, 2015 by ANON.*

**Physics**

Mr. Martin springs off a 5 meter high diving board with an upward velocity of 20 m/s. A. Find Mr. Martin's height, velocity and acceleration after 0.5 seconds. B. Determine when Mr. Martin will hit the water. C. What is Mr. Martin's maximum height off the board? D. ...
*Sunday, December 20, 2015 by Thea*

**Physics**

If a steel block is on an inclining steel plane,at what angle will the block start to slide.
*Sunday, December 20, 2015 by jake*

**Physics 1st**

What will be apparent length of a rod 1m long moving with 0.7c
*Sunday, December 20, 2015 by Shivam*

**physics **

M1.) Nguyen jumps off a cliff with a height of 100 meters at a velocity of 3.5 meters per second to a save a cat. How long will it take her to reach the surface of the ocean? A3.) A plane vertically flees a horde of zombies at a speed of 7.9 m/s at a height of 230m above the ...
*Sunday, December 20, 2015 by Jamie*

**physics**

A car with mass m possesses momentum of magnitude p. Which expression correctly represents the kinetic energy, KE, of the car in terms of m and p?
*Sunday, December 20, 2015 by Anonymous*

**physics**

Two cars, one of mass 1300 kg, and the second of mass 2200 kg, are moving at right angles to each other when they collide and stick together. he initial velocity of the first car is 14 m/s in the positive x direction and that of the second car is 18 m/s in the positive y ...
*Sunday, December 20, 2015 by luma*

**physics**

Two ice skaters approach each other at right angles. Skater A has a mass of 30.7 kg and travels in the +x direction at 2.64 m/s. Skater B has a mass of 109 kg and is moving in the +y direction at 1.29 m/s. They collide and cling together. Find the final speed of the couple. ...
*Sunday, December 20, 2015 by luma*

**physics**

A(n) 2864 kg van runs into the back of a(n) 856 kg compact car at rest. They move of together at 7.5 m/s. Assuming no friction with the ground, find the initial speed of the van. Answer in units of m/s.
*Sunday, December 20, 2015 by luma*

**physics**

A rifle with a weight of 17 N fires a 3.6 g bullet with a speed of 231 m/s. The acceleration of gravity is 9.81 m/s 2 . Find the recoil speed of the rifle. Answer in units of m/s.
*Sunday, December 20, 2015 by luma*

**physics**

High-speed stroboscopic photographs show that the head of a 192 g golf club is traveling at 44.4 m/s just before it strikes a 45.9 g golf ball at rest on a tee. After the collision, the club head travels (in the same direction) at 28.7 m/s. Find the speed of the golf ball ...
*Saturday, December 19, 2015 by luma*

**physics**

A 13 g toy car moving to the right at 22 cm/s has a head-on nearly elastic collision with a 22 g toy car moving in the opposite direction at 30 cm/s. After colliding, the 13 g car moves with a velocity of 43 cm/s to the left. Find the speed of the second car after the ...
*Saturday, December 19, 2015 by luma*

**physics**

A 24.9 g marble sliding to the right at 22.0 cm/s overtakes and collides elastically with a 13.2 g marble moving in the same direction at 11.8 cm/s. After the collision, the 13.2 g marble moves to the right at 25.0 cm/s. Find the velocity of the 24.9 g marble after the ...
*Saturday, December 19, 2015 by luma*

**physics**

If a 696 N man holds the rifle firmly against his shoulder, find the recoil speed of man and rifle. Answer in units of m/s.
*Saturday, December 19, 2015 by luma*

**physics**

Two carts with masses of 13.2 kg and 3.0 kg move in opposite directions on a frictionless horizontal track with speeds of 6.8 m/s and 3.5 m/s, respectively. The carts stick together after colliding head-on. Find their final speed. Answer in units of m/s.
*Saturday, December 19, 2015 by luma*

**Physics (Heat)**

Sitting under the fan on a hot day makes us feel cool.why? Give reason
*Saturday, December 19, 2015 by Anuja*

**Physics for **

A force has the dependence Fx(x) = -kx^4 on the displacement x, where the constant k = 20.3 N/m^4. How much work does it take to change the displacement, working against the force, from 0.730 m to 1.35 m?
*Saturday, December 19, 2015 by Khalid*

**Physics**

A gram molecule of a gas at 127°C expands isothermally until its volume is doubled. Find the amount of work done and heat absorbed.
*Saturday, December 19, 2015 by Ques*

**physics**

A rock is shot up vertically upward from the edge of the top of the building. The rock reaches its maximum height 2 s after being shot. Them, after barely missing the edge of the building as it falls downward, the rock strikes the ground 8 s after it was launched. Find (a) ...
*Friday, December 18, 2015 by Jake*

**physics**

Let's say you're driving in your car, approaching a red light on the Camp Hill Bypass. A black Porsche is stopped at the light in the right lane, but there's no-one in the left lane, so you pull into the left lane. You're traveling at 40 km/hr, and when you'...
*Friday, December 18, 2015 by Jake*

**physics**

What must be the radius of an unbanked (flat) curve so that a car can safely travel at a maximum speed of 39 m/s? The coefficient of static friction is 0.70.
*Friday, December 18, 2015 by EMILY*

**PHYSICS**

An object is initially moving in the positive direction of an x-axis with a speed of 2.7 m/s. If the constant acceleration of the object is -0.12 m/s2, what distance will it have traveled when it turns around?
*Friday, December 18, 2015 by rebecca*

**Physics**

A ski jumper glides down a 30.0 degrees slope for 80.0 ft before taking off from a negligibly short horizontal ramp. If the jumpers takeoff speed is 45.0 ft/s, what is the coefficient of kinetic friction between skis and slope?
*Friday, December 18, 2015 by Khalid*

**Art**

file:///C:/Users/Piccollo/Desktop/1190597-6192014-20424-PM-1750126416.jpg In this creation what important components are used to the greatest effect? A)color and space B)architectural design**** C)physics and mathematics D)innovation and creativity Am I right?
*Friday, December 18, 2015 by Animesawesome*

**Physics**

A father pulls his son, whos mass is 25 kg and who is sitting on a swing with ropes of length 3 meters, backward until the ropes make an angle of 33.6 degrees with respect to the vertical. He then releases his son from rest. What is the speed of the son at the bottom of the ...
*Friday, December 18, 2015 by Khalid*

**Physics**

A father pulls his son, whos mass is 25 kg and who is sitting on a swing with ropes of length 3 meters, backward until the ropes make an angle of 33.6 degrees with respect to the vertical. He then releases his son from rest. What is the speed of the son at the bottom of the ...
*Friday, December 18, 2015 by Khalid*

**Physics**

1)An alloy of copper zinc has a mass of 4.9kg.when suspended in water.0.98kg of water was displaced by it.calculate the mass of zinc in the alloy if 2.5 and 19.6 are the specific gravity of the zinc and copper respectively 2) A steel ball of diameter 0.2mm, falls with a ...
*Friday, December 18, 2015 by Skyboy*

**Physics**

A box of unknown mass is sliding with an initial speed vi = 5.40 m/s across a horizontal friction-less warehouse floor when it encounters a rough section of flooring d = 3.50 m long. The coefficient of kinetic friction between the rough section of flooring and the box is 0.100...
*Thursday, December 17, 2015 by Anonymous*

**Physics**

A person weighs 600 N on Earth. What is the person's mass?
*Thursday, December 17, 2015 by Val*

**Physics**

A father pulls his son, whos mass is 25 kg and who is sitting on a swing with ropes of length 3 meters, backward until the ropes make an angle of 33.6 degrees with respect to the vertical. He then releases his son from rest. What is the speed of the son at the bottom of the ...
*Thursday, December 17, 2015 by Khalid*

**physics**

If a steel cube is placed on a surface that is increasing in slope. At what angle will the cube start to move
*Thursday, December 17, 2015 by jake*

**Physics!**

A person is standing on a 10-m bridge above a road. He wants to jump from the bridge and land in the bed of a truck that is approaching him at 30 m/s. In order to clear the bridge railing, he has to jump upward initially with a speed of 5 m/s. How far away should the truck be ...
*Thursday, December 17, 2015 by Emma*

**Physics**

Two springs are set up on a table. The longer spring has a spring constant of 221 N/m and an initial length of 44.0cm. The shorter spring has a spring constant of 725 N/m and an initial length of 22.0cm. How far above the table is an 9.30kg ball when it reaches its equilibrium...
*Thursday, December 17, 2015 by john*

**PHYSICS**

FIND THE MASS OF A 200 n BABY ELEPHANT
*Thursday, December 17, 2015 by JESSICA*

**PHYSICS! Really Confused! Test Tmrw**

A person is standing on a 10-m bridge above a road. He wants to jump from the bridge and land in the bed of a truck that is approaching him at 30 m/s. In order to clear the bridge railing, he has to jump upward initially with a speed of 5 m/s. HOW FAR AWAY SHOULD THE TRUCK BE ...
*Thursday, December 17, 2015 by Emma*

**Physics**

Two springs are set up on a table. The longer spring has a spring constant of 221 N/m and an initial length of 44.0cm. The shorter spring has a spring constant of 725 N/m and an initial length of 22.0cm. How far above the table is an 9.30kg ball when it reaches its equilibrium...
*Thursday, December 17, 2015 by Anon*

**Physics**

mike is skiing downhill at a 25 degree angle. if his weight is 350N assuming there is no friction what is his acceleration
*Thursday, December 17, 2015 by Karissa*

**physics **

Charge Q1=6.0 nC is at (0.30 m, 0), charge Q2=−1.0 nC is at (0, 0.10 m), and charge Q3=5.0 nC is at (0, 0). What is the magnitude of the net electrostatic force on the 5.0-nC charge due to the other charges? What is the direction of the net electrostatic force on the 5.0...
*Thursday, December 17, 2015 by ira*

**Physics**

A golfer rides in a golf cart at an average speed of 3.93 m/s for 43.3 s. She then gets out of the cart and starts walking at an average speed of 1.13 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 1.99 m/s? Can ...
*Thursday, December 17, 2015 by Josh*

**chemistry, physics**

What is the most important source of error in the calorimeter experiment? I know few, but I don't know what is the most important source of error. Stirring error the calorimeter is not properly insulated Calculation error Measurement error in volume and or weight
*Wednesday, December 16, 2015 by miyabi*

**chemistry, physics**

How would you be able to utilize a calorimeter to determine the specific heat of substance that has a lower density than water?
*Wednesday, December 16, 2015 by miyabi*

**chemistry, physics**

In the specific heat measurement does the sample have to be 100 C, or would a lower initial temperature do just aa well? I wrote down it doesn't matter, but i don't know why.
*Wednesday, December 16, 2015 by miyabi*

**physics.. **

This seems easy and yet i'm skeptical if these are actually supposed to be difficult.. It asks for a lot. It's seems repetitive.. 1. a falling stone takes .30 seconds to travel past a window 2.2m tall. From what height above the top of the window did the stone fall? 2...
*Wednesday, December 16, 2015 by Abby*

**chemistry, physics**

When measuring specific heat, why should your final temperature be the maximum temperature reached calorimeter?
*Wednesday, December 16, 2015 by miyabi*

**physics**

A 2.0 kg mass rests on a frictionless wedge that has an acceleration of 15 m/s2 to the right. The mass remains stationary relative to the wedge, moving neither higher nor lower. (a) What is the angle of inclination, θ, of the wedge, i.e., the angle between the inclined ...
*Wednesday, December 16, 2015 by Anonymous*

**Physics**

A golf ball is dropped from rest from a height of 8.30 m. It hits the pavement, then bounces back up, rising just 5.00 m before falling back down again. A boy then catches the ball when it is 1.10 m above the pavement. Ignoring air resistance, calculate the total amount of ...
*Wednesday, December 16, 2015 by Courtney*

**Physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 6.04 m/s. The car is a distance d away. The bear is 28.8 m behind the tourist and running at 7.26 m/s. The tourist reaches the car safely. What is the maximum possible value for d?
*Wednesday, December 16, 2015 by Courtney*

**PHYSICS**

A golfer rides in a golf cart at an average speed of 3.93 m/s for 43.3 s. She then gets out of the cart and starts walking at an average speed of 1.13 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 1.99 m/s?
*Wednesday, December 16, 2015 by James*

**PHYSICS**

A box is sliding up an incline that makes an angle of 21.8° with respect to the horizontal. The coefficient of kinetic friction between the box and the surface of the incline is 0.170. The initial speed of the box at the bottom of the incline is 3.48 m/s. How far does the ...
*Wednesday, December 16, 2015 by James*

**physics**

A golf ball is dropped from rest from a height of 8.30 m. It hits the pavement, then bounces back up, rising just 5.00 m before falling back down again. A boy then catches the ball when it is 1.10 m above the pavement. Ignoring air resistance, calculate the total amount of ...
*Wednesday, December 16, 2015 by chris*

**physics**

A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 90.3 m/s2 for 1.75 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) ...
*Wednesday, December 16, 2015 by chris*

**physics**

A golfer rides in a golf cart at an average speed of 3.93 m/s for 43.3 s. She then gets out of the cart and starts walking at an average speed of 1.13 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 1.99 m/s?
*Wednesday, December 16, 2015 by chris*

**physics**

A projectile is launched from and returns to ground level, as the figure shows. There is no air resistance. The horizontal range of the projectile is measured to be R= 166 m, and the horizontal component of the launch velocity is v0x = 26.0 m/s. Find the vertical component v0y...
*Wednesday, December 16, 2015 by chris*

**physics**

Traveling at a speed of 16.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.590. What is the speed of the automobile after 1.35 s have elapsed? Ignore the effects of...
*Wednesday, December 16, 2015 by chris*

**physics**

Traveling at a speed of 19.0 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.660. What is the speed of the automobile after 1.31 s have elapsed? Ignore the effects of ...
*Wednesday, December 16, 2015 by trish*

**physics **

a radioactive sample has a decay rate R of 518 decay/min at time t=7 min and 156 decay/ min at time t=17 min. calculate the decay constant and the initial decay rate?
*Wednesday, December 16, 2015 by renaa *

**physics**

Chapter 02, Problem 62 A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 90.3 m/s2 for 1.75 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum ...
*Wednesday, December 16, 2015 by trish*

**physics**

A golf ball is dropped from rest from a height of 8.30 m. It hits the pavement, then bounces back up, rising just 5.00 m before falling back down again. A boy then catches the ball when it is 1.10 m above the pavement. Ignoring air resistance, calculate the total amount of ...
*Wednesday, December 16, 2015 by trish*

**physics**

A golf ball is dropped from rest from a height of 8.30 m. It hits the pavement, then bounces back up, rising just 5.00 m before falling back down again. A boy then catches the ball when it is 1.10 m above the pavement. Ignoring air resistance, calculate the total amount of ...
*Wednesday, December 16, 2015 by trish*

**physics**

Consult Interactive Solution 2.22 before beginning this problem. A car is traveling along a straight road at a velocity of +38.8 m/s when its engine cuts out. For the next 2.01 seconds, the car slows down, and its average acceleration is . For the next 6.36 seconds, the car ...
*Wednesday, December 16, 2015 by trish*