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April 18, 2014

April 18, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

660
*Thursday, March 6, 2014 at 3:20pm*

**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...
*Thursday, March 6, 2014 at 3:12pm*

**Physics**

1. Two blocks on a frictionless horizontal surface are connected by a light string. where m1 = 6.21 kg and m2 = 19.5 kg. A force of 48.4 N 6.21kg --T-- 19.5kg ----->48.4 N The acceleration of gravity is 9.8 m/s^2. Find the acceleration of the system. Answer in units of m/s^...
*Thursday, March 6, 2014 at 3:08pm*

**physics? math?**

.
*Thursday, March 6, 2014 at 3:06pm*

**physics**

A smooth block is released at an angle of 30 degree incline & then slide distance d. The time taken is 'x' times as much to slide on rough inclined plane than on smooth inclined. Then what is coefficient of friction?
*Thursday, March 6, 2014 at 2:20pm*

**Math Help**

I have to do this question in several ways like any possible way to do it so I've found one mathematical way, I can't do it like a physics question cause it's math. a bike travels at a constant speed of 10km/h. a bus starts 175 km behind the bike and catches up to ...
*Thursday, March 6, 2014 at 2:17pm*

**physics**

A string going over a massless frictionless pulley connects two blocks of masses 4.4 kg and 11 kg. As shown on the picture below, the 4.4 kg block lies on a 23◦ incline; the coefficient of kinetic friction between the block and the incline is μ = 0.29. The 11 kg ...
*Thursday, March 6, 2014 at 1:24pm*

**physics multiple choice**

ui;
*Thursday, March 6, 2014 at 12:03pm*

**physics**

normal force = m g cos 45 so friction down slope = .3 m g cos 45 at 45 sin 45 = cos 45 = sqrt 2/2 weight down slope = m g sin 45 15 N = m g sin 45 + .3 m g cos 45 15 N = (m g sqrt 2/2)( 1 + .3) 30/1.3 sqrt 2 = m g = weight if friction he other way then F up = (m g sqrt 2/2)( 1...
*Thursday, March 6, 2014 at 11:14am*

**physics**

a block moves up 45degree incline w/ constant speed under the action of a force of 15n applied parallel to the incline.If the coefficient of kinetic friction is 0.3, determine the weight of the block and minimum force required to allow the block to move down the incline at ...
*Thursday, March 6, 2014 at 9:41am*

**Physics**

you have distance, time horizonal velocity=horizontaldistance/time = 60/3.6 m/s
*Thursday, March 6, 2014 at 8:18am*

**Physics**

!@#$%^& PHYSICS
*Thursday, March 6, 2014 at 2:24am*

**Physics**

A rock is thrown off a bridge at an angle of 38degree above horizontal, and landed in the water 3.60 seconds later 60.0 meters from the point at the waters level directly below the thrower... What is the rock's horizontal velocity? I need better clarity on physics, please?
*Wednesday, March 5, 2014 at 11:47pm*

**physics**

1. A ship has a top speed of 3.0 m/s in calm water. The current of the ocean tends to push the boat at 2.0 m/s on a bearing of due South. What will be the net velocity of the ship if the captain points his ship on a bearing of 55 North or West and applies full power?
*Wednesday, March 5, 2014 at 11:41pm*

**Physics**

A superball with a mass of 71.2 g is dropped from a height of 2.5 m. It rebounds to a height of 2 m. What is the change in its linear momen- tum during the collision with the floor? The acceleration of gravity is 9.8 m/s2 . Answer in units of kg · m/s
*Wednesday, March 5, 2014 at 11:05pm*

**physics**

what is the physics behind the process of administering the following 1. measurement of blood pressure using sphygmomanometer 2.giving injections 3.administering intravenous infusion 4.giving oxygen in the ward and operating theater 5. administering blood transfusion 6.sucking...
*Wednesday, March 5, 2014 at 11:04pm*

**Physics**

F = m*g = 0.05kg * 9.8N/kg = 0.49 N. d = 18-12 = 6 cm = 0.06 m. k = 0.49N/0.06m = 8.17N/m.
*Wednesday, March 5, 2014 at 10:40pm*

**Physics**

After a 0.200-kg rubber ball is dropped from a height of 1.95 m, it bounces off a concrete floor and rebounds to a height of 1.45 m. (a) Determine the magnitude and direction of the impulse delivered to the ball by the floor. (b) Estimate the time the ball is in contact with ...
*Wednesday, March 5, 2014 at 9:29pm*

**Physics**

If m1 = 4.72kg, what mass m2 is required to balance the system? (two masses are connected by a rope. m1 is sitting on an incline and m2 is hanging from a pulley)
*Wednesday, March 5, 2014 at 8:53pm*

**Physics**

distance engineer moved = 500 m = .5 km average speed = (84.2 +16.4)/2 = 50.3 km/hr (during constant acceleration you can use the average of first and last for the distance and time) time = distance/speed = .5km / 50.3 km/hr = .00994 hours * 3600 = 35.8 seconds
*Wednesday, March 5, 2014 at 8:51pm*

**Physics**

charge has no effect on mass
*Wednesday, March 5, 2014 at 8:39pm*

**Physics**

m g down mu m g friction force F = m a mu m g = m a a = mu g = .4 (9.81) = 3.92 m/s^2 a = change in speed/time change in speed = v average speed during stop = v/2 distance = average speed * time 5 meters = v/2 t so t = 10/v a = v /(10/v) = v^2/10 so v^2/10 = 3.92 v^2 = 39.2 v...
*Wednesday, March 5, 2014 at 8:38pm*

**Physics**

A train 500 m long is moving on a straight track with a speed of 84.2 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.4 km/h. Assuming constant acceleration, determine how long the train blocked the crossing....
*Wednesday, March 5, 2014 at 8:34pm*

**Physics**

If the spherical ball is negatively charged.How the mass of the sphere or ball get effected?
*Wednesday, March 5, 2014 at 8:26pm*

**Physics**

A 0.80 10^3 kg Toyota collides into the rear end of a 2.6 1^03 kg Cadillac stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 5.0 m before stopping. The police officer, knowing that the coefficient of kinetic friction between tires ...
*Wednesday, March 5, 2014 at 8:20pm*

**Physics**

D= mass times volume Think of it as a pie shape so density is on top and mass and volume is on the bottom.... so you have to times 85 and 550 to get 382850 g/cm3
*Wednesday, March 5, 2014 at 8:08pm*

**Physics**

You look it up.
*Wednesday, March 5, 2014 at 7:56pm*

**Physics**

so in my head I am supposed to have stored the Young's modulus of steel ? delta L/L = tensile stress/E or delta L = F L /(E A) F = 4700 N A = (pi/4) .005^2 meters^2 L = 1.2 meters E = you look it up
*Wednesday, March 5, 2014 at 7:54pm*

**Physics**

A piece of metal has a mass of 85 cg and a volume of 450L. What is it's density in g/cm3?
*Wednesday, March 5, 2014 at 7:48pm*

**Physics**

A 1.2m -long steel rod with a diameter of 0.50cm hangs vertically from the ceiling. An auto engine weighing 4.7kN is hung from the rod. By how much does the rod stretch?
*Wednesday, March 5, 2014 at 7:46pm*

**Physics**

F = G M m/r^2 = m Ac so Ac = G M/r^2 G = 6.67 * 10^-11 M = 6 * 10^24 kg Copy this 4175 miles = meters into a Google search box and get r = 6.72*10^6 meters and 90 minutes is 5,400 seconds
*Wednesday, March 5, 2014 at 7:46pm*

**Physics**

acceleration= v^2/r= = (2pir/period)^2/r= 2PI*(r)/period^2 no change 90 min to seconds, and 4175 miles to meters, and you have it.
*Wednesday, March 5, 2014 at 7:44pm*

**Physics**

length= 10ft(12in/ft)(2.54cm/in) do the math.
*Wednesday, March 5, 2014 at 7:42pm*

**Physics**

how many centimeters long is the proverbial "10-foot pole?"
*Wednesday, March 5, 2014 at 7:38pm*

**Physics**

There is no horizontal force. Therefore the horizontal velocity REMAINS CONSTANT v = - g t = -9.81*5 = 49 m/s down
*Wednesday, March 5, 2014 at 7:34pm*

**Physics**

A satellite that is 4175 miles from the center of the earth, orbits with a period of 90 minutes. What is its centripetal acceleration?
*Wednesday, March 5, 2014 at 7:32pm*

**Physics**

You throw a ball horizontally off a building with a horizontal velocity of 10m/s. What is the ball's horizontal velocity 5 seconds later. What is the ball's vertical velocity 5 seconds later?
*Wednesday, March 5, 2014 at 7:25pm*

**physics**

F = G M m /d^2 6.67*10^-11*7.8*10^23*2.5*10^4/57.8*10^16 =2.25 * 10^0 = 2.25 N
*Wednesday, March 5, 2014 at 7:13pm*

**Physics**

for a more elaborate analysis see http://www.braeunig.us/space/propuls.htm read starting around equation (1.11)
*Wednesday, March 5, 2014 at 7:05pm*

**Physics**

initial momentum = 4.6*10^4 * 6.3*10^3 = 29 * 10^7 kgm/s no external forces so that is the final momentum final momentum = ship mass m *7.84*10^3 + exhaust momentum exhaust mass = (4.6*10^4 - m) what is the exhaust speed? I assume that 4.86 * 10^3 is relative to the space ship...
*Wednesday, March 5, 2014 at 6:52pm*

**physics**

(1/2) m u^2 = m g (Hup - Hdown) so u = sqrt(2*9.81*.954) u is horizontal speed, does not change How long in the air? Well, how long to fall .256 m ? .256 = 4.9 t^2 solve for t, time in the air distance horizontal = d = u t
*Wednesday, March 5, 2014 at 6:32pm*

**physics**

A 25000 kg rock is located at a distance of 7.6 x 108 m away from a small planet of mass 7.8 x 1023 kg. What is the mutual force of attraction between these two
*Wednesday, March 5, 2014 at 6:25pm*

**Physics**

A spaceship with a mass of 4.60 10^4 kg is traveling at 6.30 10^3 m/s relative to a space station. What mass will the ship have after it fires its engines in order to reach a speed of 7.84 10^3 m/s? Assume an exhaust velocity of 4.86 10^3 m/s.
*Wednesday, March 5, 2014 at 6:23pm*

**Physics**

work in = potential energy stored = (1/2) k x^2 double x, four times the energy stored so four times the work in.
*Wednesday, March 5, 2014 at 6:21pm*

**physics**

A 1.80-kg block slides down a frictionless ramp.The top of the ramp is h1 = 1.21 m above the ground; the bottom of the ramp is h2 = 0.256 m above the ground. The block leaves the ramp moving horizontally, and lands a horizontal distance $d$ away. Calculate the distance d.
*Wednesday, March 5, 2014 at 6:19pm*

**Physics**

3/4 = .75 hour at 70 ---> 52.5 1/6 = .167 hr at 95 ---> 15.8 1/2 = .5 hr at 55 ---> 27.5 20/60 = .333 hr at 0 --> 0 total time = 1.75 hours total distance = 95.8 km so 95.8 km / 1.75 hr = 54.7 km/hour
*Wednesday, March 5, 2014 at 6:18pm*

**Physics**

Does it take twice the work to stretch a spring 2cm from its equilibrium position as it does to stretch it 1cm from its equilibrium position?
*Wednesday, March 5, 2014 at 6:16pm*

**physics**

Two blocks, each with a mass m = 0.400 kg, can slide without friction on a horizontal surface. Initially, block 1 is in motion with a speed $v$ = 1.20 m/s; block 2 is at rest. When block 1 collides with block 2, a spring bumper on block 1 is compressed. Maximum compression of ...
*Wednesday, March 5, 2014 at 6:07pm*

**physics**

4
*Wednesday, March 5, 2014 at 5:47pm*

**physics**

A dust particle carrying a charge of is 2 mm to the left of another dust particle carrying a charge of . Find the magnitude and direction of the elec- tric force on the first particle.
*Wednesday, March 5, 2014 at 5:38pm*

**Physics***

222
*Wednesday, March 5, 2014 at 5:36pm*

**Physics**

Please help me with the following problem: Joe is on a cross-country trip from New York to Los Angeles. He drives for 45.0 min at 70.0 km/h, 10.0 min at 95 km/h, and 30.0 min at 55.0 km/h, and he spends 20.0 min eating lunch and buying gas. What is the average speed for this ...
*Wednesday, March 5, 2014 at 5:26pm*

**physics**

A block of mass m = 2.7 kg is released from rest at a height of H = 0.49 m on a curved frictionless ramp. At the foot of the ramp is a spring whose spring constant is k = 515.0 N/m. What is the maximum compression of the spring, x? B)After the spring reaches its maximum ...
*Wednesday, March 5, 2014 at 4:50pm*

**Physics**

initial momentum = 3.7 * 5 = 18.5 kg m/s mass after crash = 3.7 + 2.0 = 5.7 kg so 18.5 = 5.7 u u = 3.25 m/s which is the horizontal speed until it hits the floor. NOW I DO NOT BELIEVE that your table is 6.9 meters high so I will just outline the rest How long to fall h meters...
*Wednesday, March 5, 2014 at 4:38pm*

**Physics - I am Confused**

Also, why did you convert the minutes into seconds, but in fraction form? The home-school lesson did not teach me how to do that. I don't understand why you would turn it into a fraction, can you explain it to me?
*Wednesday, March 5, 2014 at 4:31pm*

**Physics**

In the figure below, a 3.7 kg box of running shoes slides on a horizontal frictionless table and collides with a 2.0 kg box of ballet slippers initially at rest on the edge of the table, at height h = 6.9 m. The speed of the 3.7 kg box is 5.0 m/s just before the collision. If ...
*Wednesday, March 5, 2014 at 4:31pm*

**Physics**

Okay, I get what you did, but is there other ways of doing this?
*Wednesday, March 5, 2014 at 4:27pm*

**Physics**

average velocity=distance/time distance=3/4*70+1/6*95 + 1/2*55 time= (45+10+30)/60 check my thinking. I get none of the answers.
*Wednesday, March 5, 2014 at 4:10pm*

**Physics**

work done by friction: (M+m)g*mu*distance KE after imact: 1/2 (M+m)*v^2 set them equal, solve for v just after impact. Now, use the conservation of momentum (M+m)V=mV' solve for V', the speed before the impact.
*Wednesday, March 5, 2014 at 4:05pm*

**Physics**

In order to convert a tough split in bowling, it is necessary to strike the pin a glancing blow as shown in Fig. 9-47. The bowling ball, initially traveling at 13.0 m/s, has four times the mass of a pin and the pin flies off at 80° from the original direction of the ball. ...
*Wednesday, March 5, 2014 at 3:54pm*

**Physics**

A 96.0-g wooden block is initially at rest on a rough horizontal surface when a 11.4-g bullet is fired horizontally into (but does not go through) it. After the impact, the block–bullet combination slides 6.5 m before coming to rest. If the coefficient of kinetic friction...
*Wednesday, March 5, 2014 at 3:54pm*

**Physics**

Please help me with the following problem: Joe is on a cross-country trip from New York to Los Angeles. He drives for 45.0 min at 70.0 km/h, 10.0 min at 95 km/h, and 30.0 min at 55.0 km/h, and he spends 20.0 min eating lunch and buying gas. What is the average speed for this ...
*Wednesday, March 5, 2014 at 3:47pm*

**physics**

north
*Wednesday, March 5, 2014 at 1:50pm*

**science**

physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, esp. as distinct from energy.
*Wednesday, March 5, 2014 at 1:37pm*

**physics**

F = G M m/R^2 = m v^2/R so v^2 = G M/R G = 6.67 * 110^-11 M = 6 * 10^24 Re = 6.38*10^6 meters Ra = 6.38*10^6 + .418*10^6 Rb = 6.38*10^6 + .731*10^6
*Wednesday, March 5, 2014 at 11:10am*

**physics 1**

F = G Mm/R^2 = m v^2/R v^2 R = G M = 6.67*10^-11 * 5.98*10^24 v^2 R = 39.9 * 10^13 v T = circumference = 2 pi R so R = v T/(2 pi) R = v [1.77*10^4/(2 pi)] R = 2.82*10^3 v so v^3 (2.82*10^3) = 39.9 * 10^13 v^3 = 14.1 * 10^10 = 141 * 10^9 v = 5.2 * 10^3 v = 5,200 m/s
*Wednesday, March 5, 2014 at 11:05am*

**physics**

I assume that a Mg is a "megagram, a term I have never heard before. In that case we have 4*10^6 grams which is 4,000 Kilograms 4,000 * 30 = 120,000 kg m/s south
*Wednesday, March 5, 2014 at 10:52am*

**physics**

What is the momentum of a 4 Mg semi truck going 30 m/s south?
*Wednesday, March 5, 2014 at 10:40am*

**physics**

Two satellites are in circular orbits around the earth. The orbit for satellite A is at a height of 418 km above the earth’s surface, while that for satellite B is at a height of 731 km. Find the orbital speed for (a) satellite A and (b) satellite B.
*Wednesday, March 5, 2014 at 8:39am*

**physics 1**

A satellite is in a circular orbit about the earth (ME = 5.98 x 1024 kg). The period of the satellite is 1.77 x 104 s. What is the speed at which the satellite travels?
*Wednesday, March 5, 2014 at 8:35am*

**Physics**

What exactly is Maggie's situation value? Which may perhaps not be as simple as QuotesChimp appears to discover. Calculating her unique problems looks easy, plus often it is. But occasionally issues aren't constantly as they seem initially. Say imagine if Maggie had ...
*Wednesday, March 5, 2014 at 8:24am*

**physics**

100j
*Wednesday, March 5, 2014 at 6:57am*

**physics**

7820N
*Wednesday, March 5, 2014 at 6:30am*

**Physics**

How do u solve the question?
*Wednesday, March 5, 2014 at 5:31am*

**college physics 1**

Reviewing Interactive Solution 5.46 will help in solving this problem. A stone is tied to a string (length = 1.29 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next...
*Wednesday, March 5, 2014 at 3:36am*

**college physics 1**

A special electronic sensor is embedded in the seat of a car that takes riders around a circular loop-the-loop ride at an amusement park. The sensor measures the magnitude of the normal force that the seat exerts on a rider. The loop-the-loop ride is in the vertical plane and ...
*Wednesday, March 5, 2014 at 3:35am*

**college physics 1**

Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 35.1 km/s and 63.3 km/s. The slower planet's orbital period is 6.74 years. (a) What is the mass of the star? (b) What ...
*Wednesday, March 5, 2014 at 3:35am*

**physics**

3
*Wednesday, March 5, 2014 at 1:35am*

**physics**

A DC circuit has a single battery of voltage V = 10.0 V attached to a resistor R = 100 Ohms. If the voltage is increased to 20.0 V, then by what factor does the power emitted by the resistor increase?
*Wednesday, March 5, 2014 at 12:33am*

**Physics**

Two children pull a third child on a snow saucer sled exerting forces F1 and F2 as shown from above in Figure 4.36. Find the acceleration of the 49.00-kg sled and child system. Note that the direction of the frictional force is unspecified; it will be in the opposite direction...
*Tuesday, March 4, 2014 at 11:52pm*

**physics**

A roller-coaster car of mass 1.80 103 kg is initially at the top of a rise at point circle a. It then moves 40.8 m at an angle of 50.0° below the horizontal to a lower point circle b. (a) Find both the potential energy of the system when the car is at points circle a and ...
*Tuesday, March 4, 2014 at 11:26pm*

**Physics**

A 96.0-g wooden block is initially at rest on a rough horizontal surface when a 11.4-g bullet is fired horizontally into (but does not go through) it. After the impact, the block–bullet combination slides 6.5 m before coming to rest. If the coefficient of kinetic friction...
*Tuesday, March 4, 2014 at 11:22pm*

**Physics **

A sound wave in a solid has a frequency of 15.0 kHz and a wavelength of 0.333 m. What would be the wave speed, and how much faster is this speed than the speed of sound in air?
*Tuesday, March 4, 2014 at 10:45pm*

**AP physics**

Pilots of high-performance fighter planes can be subjected to large centripetal accelerations during high-speed turns. Because of these accelerations, the pilots are subjected to forces that can be much greater than their body weight, leading to an accumulation of blood in the...
*Tuesday, March 4, 2014 at 10:42pm*

**physics**

The plane is traveling at 288 m/s on a vertical circle of radius 622 m. Determine the ratio of the normal force to the magnitude of the pilot's weight. For comparison, note that black-out can occur for ratios as small as 2 if the pilot is not wearing an anti-G suit.
*Tuesday, March 4, 2014 at 10:41pm*

**physics**

A stone is tied to a string (length = 1.25 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next, the circle is vertical. In the vertical case the maximum tension in ...
*Tuesday, March 4, 2014 at 10:19pm*

**introductory to physics**

A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 4.0 m/s. The acceleration of gravity is 9.81 m/s 2 . What is the initial height of the bob? Answer in units of m
*Tuesday, March 4, 2014 at 10:10pm*

**physics**

A bullet with mass 4.95 g is fired horizontally into a 1.994 kg block attached to a horizontal spring. The spring has a constant 5.58 10^2 N/m and reaches a maximum compression of 6.27 cm. (a) Find the initial speed of the bullet-block system. (b) Find the speed of the bullet.
*Tuesday, March 4, 2014 at 10:06pm*

**physics **

Can you help me everybodyyyy!!!! A charge Q = 14.0 μC is distributed evenly on a wire bent into an arc of radius R = 40.0 cm, as shown in the figure. What is the electric field at the center of the arc that subtends θ = ±53.0°?
*Tuesday, March 4, 2014 at 10:01pm*

**physics**

A pilot heads her plane with a velocity of 275 km/hr north. If there is a strong wind of 130 km/hr blowing east, what is the magnitude of the velocity of the plane in reference to the ground.
*Tuesday, March 4, 2014 at 10:01pm*

**physics**

dabuifs
*Tuesday, March 4, 2014 at 9:56pm*

**Physics**

Does it take twice the work to stretch a spring 2cm from its equilibrium position as it does to stretch it 1cm from its equilibrium position? Yes it does. (Just want to double check my answer)
*Tuesday, March 4, 2014 at 9:47pm*

**Physics**

a. Range = Vo^2*sin(2A)/g = 60 m. Vo^2*sin(60)/9.8 = 60 0.0884Vo^2 = 60 Vo^2 = 679 Vo = 26.06 m/s.[30o] b. Yo = 26.06*sin30 = 13.03 m/s = Ver. component. hmax = (Y^2-Yo^2)/2g hmax = (0-13.03^2)/-19.6 = 8.66 m.
*Tuesday, March 4, 2014 at 9:23pm*

**Physics**

NONE !!!! work is force IN THE DIRECTION OF MOTION times distance
*Tuesday, March 4, 2014 at 9:20pm*

**Physics**

You are carrying a backpack across campus. What is the work done by your verticals carrying force on the backpack? Please explain...
*Tuesday, March 4, 2014 at 9:17pm*

**Physics**

A 96.0-g wooden block is initially at rest on a rough horizontal surface when a 11.4-g bullet is fired horizontally into (but does not go through) it. After the impact, the block–bullet combination slides 6.5 m before coming to rest. If the coefficient of kinetic friction...
*Tuesday, March 4, 2014 at 9:09pm*

**Physics**

A block of weight 4.8 N is at rest on a horizontal table. An upward vertical force of 0.6 N is applied to the block by means of a string. What is the magnitude of the force exerted by the block on the table top?
*Tuesday, March 4, 2014 at 8:52pm*

**Physics - Some equations that I used.**

One of the things that I did was: Delta d -------- Delta t and I did: m - m ------- s - s distance is m time is s I did both of them, but I get different answers. Thanks, if you guys help. :)
*Tuesday, March 4, 2014 at 8:48pm*

**Physics**

Please help me with the following problem: Joe is on a cross-country trip from New York to Los Angeles. He drives for 45.0 min at 70.0 km/h, 10.0 min at 95 km/h, and 30.0 min at 55.0 km/h, and he spends 20.0 min eating lunch and buying gas. What is the average speed for this ...
*Tuesday, March 4, 2014 at 8:44pm*

**Physics**

A 96.0-g wooden block is initially at rest on a rough horizontal surface when a 11.4-g bullet is fired horizontally into (but does not go through) it. After the impact, the block–bullet combination slides 6.5 m before coming to rest. If the coefficient of kinetic friction...
*Tuesday, March 4, 2014 at 7:36pm*

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