Sunday

March 29, 2015

March 29, 2015

Number of results: 12,612

**Physics**

A projectile is fired from ground level with an initial velocity of 50m/s and an initial angle of 30degree. Assuming g= 9.8 m/s*2, find: (a) The projectile total time of flight. (b) The maximum height attained (c) The total horizontal traveled (d) The final horizontal and ...
*September 24, 2012 by Abraham*

**physics**

While standing on a bridge 30.0 m above the ground, you drop a stone from rest. When the stone has fallen 3.20 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach the ground at the same instant? Take the ...
*January 26, 2013 by brizett*

**math**

galileo showed that objects of different weights fall at the same velocity by dropping 2 objects of different weight form the top of the leaning tower of pisa. a model for the heigh h in feet of an object dropped from an initial h0 feet is h=16t^2+h0, where t is the time in ...
*January 28, 2013 by Leslie*

**Physics**

A parachutist relies on air resistance (mainly on her parachute) to decrease her downward velocity. She and her parachute have a mass of 55.5kg and air resistance exerts a total upward force of 620N on her and her parachute. What is the combined weight of the parachutist and ...
*April 1, 2013 by Ben*

**science**

an astronaut on a space walk bumps the shuttle and starts moving away at a velocity of 0.02m/s. The astronauts mass is 100kg. He has takesa 1kr "safety week" and shoves it away in exactly the direction of his motion at a speed of 6m/s. what speed does the astronaut move back ...
*September 25, 2013 by trisha*

**science**

An astronaut on a space walk bumps the shuttle and starts moving away at a velocity of 0.02m/s. The astronauts mass is 100kg. He has takes a 1kg "safety week" and shoves it away in exactly the direction of his motion at a speed of 6m/s. What speed does the astronaut move back ...
*September 26, 2013 by Trisha*

**Science**

An astronaut on a space walk bumps the shuttle and starts moving away at a velocity of 0.02m/s. The astronauts mass is 100kg. He has takes a 1kg "safety week" and shoves it away in exactly the direction of his motion at a speed of 6m/s. What speed does the astronaut move back ...
*October 1, 2013 by Please help me.*

**physics **

You jog at 9.5 km/h for 7.0km , then you jump into a car and drive an additional 16km . With what average speed must you drive your car if your average speed for the entire 23km is to be 22 km/h? Work: i tried setting up a proportion and setting it to each other using the ...
*August 12, 2014 by Zara*

**Physics**

What is the kinetic energy of an ideal projectile of mass 19.4 kg at the apex (highest point) of its trajectory, if it was launched with an initial speed of 29.2 m/s and at an initial angle of 46.9° with respect to the horizontal? I know kinetic energy equals half of mass ...
*October 21, 2014 by Anonymous*

**physics**

An arrow is shot from the top of a building (height of 30 meters). The arrow travels 100 meters in the horizontal direction from the base of the building to the point where it hits the ground in 4 seconds. Find the angle of release, actual velocity at release, and maximum ...
*February 22, 2010 by Brad*

**College Physics**

At t=0 the current to a dc electric motor is reversed, resulting in an angular displacement of the motor shaft given by theta(t)= 258t - 20.4t^2 - 1.47t^3 How many revolutions does the motor shaft turn through between the time when the current is reversed and the instant when ...
*October 30, 2012 by Lizzy*

**Pre-Calculus**

An Alfa Romeo going at 70 mph requires 169 feet to stop. Assuming that the stopping distance is proportional to the square of velocity, find the stopping distances required by an Alfa Romeo going at 35 mph and at 140 mph (its top speed).
*February 3, 2013 by Becky*

**physics**

Which of the following statements about a system in resonance is true A.The energy of the system is always increasing. B.The greater the damping the larger the amplitude of the oscillations C.The driving force is always in the direction of the velocity. D.The frequency of the ...
*April 16, 2014 by Paige*

**Physics**

object of mass 2 kg is attached to string and rotate in vertical circle of radius 1 m. at highest point it has velocity of 4 m/s. what is tension in string at that point. at lowest point it is .5 m above ground. if string breaks at highest point how far does it travel ...
*November 20, 2014 by Anonymous*

**physics**

A tallest vocano in the Solar System is the 24 km tall Martian volcano, Olympus Mons. Assume an astronaut drops a ball off the rim of the crater and that the free fall acceleration remains constant throughout the ball's 24 km fall at a value of 3.7m/s^2. Find (a) the time for ...
*September 16, 2007 by Anonymous*

**Physics / Dynamics**

After the fuel is turned off, the rotor of a jet engine decelerates under the action of air friction, which depends on the square of its speed, and constant bearing friction. Thus the deceleration is written as b + c * w^2, where b and c are constants and w is the angular ...
*April 11, 2008 by Kyle*

**Physics**

Tarzan swings on a 27.0 m long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest? (b) What is his speed at the bottom of the swing if he pushes off with a speed of 3.00 m/s? I tried to use ...
*March 10, 2010 by Kelsey*

**physics**

An airplane with a speed of 46.4 m/s is climbing upward at an angle of 44° counterclockwise from the positive x axis. When the plane's altitude is 700 m the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point ...
*December 10, 2013 by Bree*

**Physics**

A floor polisher has a rotating disk that has an 11-cm radius. The disk rotates at a constant angular velocity of 1.1 rev/s and is covered with a soft material that does the polishing. An operator holds the polisher in one place for 43 s, in order to buff an especially scuffed...
*October 15, 2014 by Anon*

**Science**

An airplane with a speed of 27.4 m/s is climbing upward at an angle of 48° counterclockwise from the positive x axis. When the plane's altitude is 860 m the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point ...
*December 12, 2014 by Prachi*

**Physics Help**

1.9 kg block slides along a frictionless surface at 1.8 m/s. A second block, sliding at a faster 4.5 m/s, collides with the first from behind and sticks to it. The final velocity of the combined blocks is 3.5 m/s. What was the mass of the second block? How do you set this ...
*August 10, 2011 by falcon306*

**PHYSICS**

When the force F acting on a particle depends only on the particle's position coordinate x, and when the particle moves along the x-axis, then the work done by the force is the area under: a) F versus x curve b) F versus v curve (v is velocity) c) F versus a curve (a is ...
*March 19, 2007 by terrence*

**physics**

Mary walked north from her home to Sheila's home, which is 4.0 kilometers away. Then she turned right and walked another 3.0 kilometers to the supermarket, which is 5.0 kilometers from her own home. She walked the total distance in 1.5 hours. What were her average speed and ...
*January 27, 2012 by Nakiya*

**physics**

A group of engineering students constructs a slingshot to launch water balloons. The angle of launch is 30° and the initial velocity of the balloon is 14 m/s. The students launch a balloon from the roof of a building and the balloon lands 42 m away from the building. How tall ...
*September 21, 2012 by joseph*

**Physics**

A group of engineering students constructs a slingshot to launch water balloons. The angle of launch is 30° and the initial velocity of the balloon is 14 m/s. The students launch a balloon from the roof of a building and the balloon lands 42 m away from the building. How tall ...
*September 21, 2012 by josephz*

**Physics**

A rifle aimed horizontally at a target fired a bullet which lands 2 cm below the aim point. If the rifle was 25 m away find a) the flight time and b) the velocity with which the bullet left the rifle. I would first have to convert the 2 cm into m but what would be the ...
*November 2, 2006 by nix*

**physics**

A 3.0-kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest. After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction. What is M?
*March 18, 2014 by Anonymous*

**Physics**

A small fish is dropped by a pelican that is rising steadily at 0.44 m/s. After 2.6 s, what is the velocity of the fish? The acceleration of gravity is 9.81 m/s^2 Answer in units of m/s & How far below the pelican is the fish after the 2.6 s? Answer in units of m
*September 11, 2014 by Valerie*

**Physics Honors**

A car travels due east with a speed of 60.0 km/h. Rain is falling vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 45.0° with the vertical. Find the velocity of the rain with respect to the car and with respect to the...
*October 16, 2010 by Kristen*

**Algebra**

A ball is thrown from an initial height of 2 meters with an initial upward velocity of 25m/s. The ball's height h (in meters) after t seconds is given by the following. Find all values of t for which the ball's height is 12 meters. Round your answer(s) to the nearest hundredth.
*May 14, 2014 by Anonymous*

**math**

A diver on a platform 40 feet in height jumps upward with an initial velocity of 5ft/s. His height in h feet after t seconds is given by the function h=-16t^2+5t+50. a. What is his maximum height? I got 50.39 b. How long will it take him to reach the surface of the water? h=-...
*March 25, 2015 by Samuel *

**Physics**

Larry leaves home at 3:02 and runs at a constant speed to the lamppost. He reaches the lamppost at 3:18, immediately turns, and runs to the tree. Larry arrives at the tree at 3:26. What is Larry's average velocity during his trip from the lamppost to the tree?
*October 4, 2010 by Bala*

**Physics**

Larry leaves home at 3:02 and runs at a constant speed to the lamppost. He reaches the lamppost at 3:18, immediately turns, and runs to the tree. Larry arrives at the tree at 3:26. What is Larry's average velocity during his trip from the lamppost to the tree?
*October 4, 2010 by Bala*

**Math(repost)**

A football is kicked with an initial velocity of 42 ft/sec at an angle of 35 degrees with the horizontal. How far has the football traveled horizontally after 0.5 sec? round to nearest tenth. Could someone explain this please? x=t|v|cos(x) x=t(42)cos35 x=42tcos35 y=t|v|sin(x)-...
*October 6, 2008 by House*

**physics**

A shell is fired from a gun with a muzzle velocity of 466m/s at an angle of 57.4 degrees with the horizontal. At the top of the trajectory, the shell explodes into two fragments of equal mass. One fragment, whose speed immediately after the explosion is zero, falls vertically...
*October 10, 2011 by Kelly*

**physic**

A pair of students are lifting a heavy trunk on move-in day. (Figure 1) Using two ropes tied to a small ring at the center of the top of the trunk, they pull the trunk straight up at a constant velocity v⃗ . Each rope makes an angle θ with respect to the vertical. ...
*October 23, 2014 by physic ----please help*

**physics**

2 cars are in a race the first car is 200m ahead of the second car.the first car is moving with a uniform velocity of 30m/s while the second car starts from rest and accelerate to a rate of 4m/s how far and how long will it take the second car to meet the first car
*February 9, 2011 by Seun*

**calculus**

At t=0 , a particle starts at the origin with a velocity of 6 feet per second and moves along the x-axis in such a way that at time t its acceleration is 12t^2 feet per second per second. Through how many feet does the particle move during the first 2 seconds?
*February 19, 2012 by illy*

**AP Physics**

At time t=0, a 2kg particle has position vector r=(5.0m)i+(-8.0m)j relative to the origin. Its velocity just then is given by v=(-5.0t^2m/s)i. For the following answers, use t for the time. A) About the origin and for t>0, what is the particle's angular momentum? B) About ...
*February 8, 2008 by Bernadette*

**physics**

A diver springs upward with an initial speed of 2.1 m/s from a 4.5 m board. (a) Find the velocity with which he strikes the water. (Hint: When the diver reaches the water, his displacement is y = -4.5 m (measured from the board), assuming that the downward direction is chosen ...
*September 7, 2008 by Shundale*

**physics**

Water flows steadily along a uniform flow tube of cross-section 30cm^2. The static pressure is 1.20 x 10^5 Pa and the total pressure is 1.28 x 10^5 Pa. Calculate the flow velocity and the mass of water per second flowing past a section of the tube. (density of water= 1000 kg/...
*March 26, 2010 by Edwin*

**physics**

A progressive and a stationary simple harmonic wave each have the same frequency of 250Hz and the same velocity of 30m/s. Calculate (i) the phase difference between two vibrating points on the progressive wave which are 10cm apart. (ii) the distance between nodes in the ...
*March 26, 2010 by Edwin*

**Physics**

A person is riding a bicycle, the wheels of a bicycle have an angular velocity of +18.5 rad/s. Then, the brakes are applied. In coming to rest, each wheel makes an angular displacement of +14.5 revolutions. (a) How much time does it take for the bike to come to rest? 1 s (b) ...
*February 22, 2011 by Lauren*

**physics**

A cannon is used by the department of forestry to launch containers of fire retardant on to a fire. the cannon is at a distance of 1kilometre from a cliff that is 0.5kilometre high from the ground and the fire is 1kilometre away from the base of the cliff. if the retardant ...
*October 15, 2011 by Abel*

**Physics**

A 2.9-kg 12-cm-radius cylinder, initially at rest, is free to rotate about the axis of the cylinder. A rope of negligible mass is wrapped around it and pulled with a force of 20 N. (a) Find the magnitude of the torque exerted by the rope. (b) Find the angular acceleration of ...
*November 9, 2011 by Kayla*

**Physics**

A diver springs upward with an initial speed of 2.23 m/s from a 3.0-m board. (a) Find the velocity with which he strikes the water. [Hint: When the diver reaches the water, his displacement is y = -3.0 m (measured from the board), assuming that the downward direction is chosen...
*December 13, 2011 by T*

**physics**

After being struck by a bowling ball, a 1.4kg bowling pin sliding to the right at 4.5 m/s collides head-on with another 1.4 kg bowling pin initially at rest. Find the final velocity of the second pin in the following situations: a)The first pin moves to the right after the ...
*November 27, 2012 by mariah*

**physics**

A pitched ball was hit by a batter at a 30ᵒ angle at a velocity of 40 m/s. The outfield wall, being very short, was just the same height as the swing of the batter’s bat. If the hit was just enough to have been a homerun, how far from the batter was the outfield wall?
*December 19, 2012 by Anonymous*

**physics**

A diver springs upward with an initial speed of 1.66 m/s from a 3.0-m board. (a) Find the velocity with which he strikes the water. [Hint: When the diver reaches the water, his displacement is y = -3.0 m (measured from the board), assuming that the downward direction is chosen...
*July 8, 2013 by tcc*

**Physics**

A hockey player's arm and stick form a 1.6 m rigid segment. If the angular speed of the player's arm/stick is 1.2 rad/s, determine the resultant velocity of a motionless puck that is hit struck on if: a) the hockey player is stationary during the swing b) the hockey player is ...
*November 7, 2013 by Tori*

**Physics **

In one dimension, a 5g ball is moving to the right at 7 m/s collides with an 8g ball moving to the left at 4 m/s for a perfectly elastic collision. What is the final velocity of both balls? I just don't understand the whole left and right thing. I have already worked it out I ...
*April 25, 2014 by Michelle*

**physics**

A ship maneuvers to within 2.47×103 m of an island’s 1.76 × 103 m high mountain peak and fires a projectile at an enemy ship 6.13 × 102 m on the other side of the peak, as illustrated. The ship shoots the projectile with an initial velocity of 2.54×102 m/s at an angle of 72.6...
*December 6, 2014 by sis*

**Physics**

A football player punts the ball at a 45.0o angle. Without an effect from the wind, the ball would travel 60.0 m horizontally. (a) What is the initial speed of the ball? (b) When the ball is near its maximum height it experiences a brief gust of wind that reduces its ...
*June 4, 2014 by Anonymous*

**physics**

considering 3 identical balls. ball 1 with initial speed V collides elastically with balls 2 & 3 whose centres are on a line perpendicular to the initial velocity of ball 1 and ball 2 & 3 are in contact with each other. ball 1 is aimed directly at the contact point and all ...
*August 24, 2014 by Udayan*

**Dynamics**

an 800 lb cannon fires a 5 lb cannonball in a horizontal direction. the cannon sits on a skid; the kinetic coefficient of friction between the skid and the horizontal surface is .25. if the cannonball has a speed of 650 ft/s when it leaves the cannon, determine a) the recoil ...
*March 15, 2015 by Matt*

**physics**

A novice pilot sets a plane's controls, thinking the plane will fly at 2.50 * 2 to the 2nd power km/h to the north. if the wind blows at 75km/h toward the southeast, what will the plane's new resultant velocity be? use graphical techniques. Are you sure you don't mean the ...
*December 25, 2006 by yostina*

**Math **

Suppose a scientist on Earth throws a baseball upward. The scientist lets go of the ball 2 meters above the ground with an initial velocity of 10 meters per second. How long does it take for the ball to hit the ground (H=0)? (Use the quadratic formula to solve this problem, ...
*July 24, 2011 by A.S. *

**applied maths**

A tram starts from rest atone station and comes to a stop one minute later at the next. It accelerates uniformly at 2m/s2 until it reaches a speed of 20m/s. It travels at this constant speed for a certain time until it decelerates back to rest at 4m/s2. Find the average ...
*September 10, 2011 by Anonymous*

**College Physics**

suppose the two cars are headed in the same direction. A 1200kg car travels at 65 mph and a 1000kg car travels at 75mph. The faster car rear-ends the slower car and their bumpers catch so that they continue moving after the collision at the same speed. Use the concepts above ...
*March 22, 2012 by Anonymous*

**Math**

A batsman hits a cricket ball 'off his toes' towards a fieldsman who is 65 m away. The ball reaches a maximum height of 4.9 m and the horizontal compoenent of its velocity is 28 m/s. Find the constant speed with which the fieldsman must run forward, starting at the instant the...
*July 14, 2012 by Candice*

**math**

A batsman hits a cricket ball 'off his toes' towards a fieldsman who is 65 m away. The ball reaches a maximum height of 4.9 m and the horizontal compoenent of its velocity is 28 m/s. Find the constant speed with which the fieldsman must run forward, starting at the instant ...
*July 15, 2012 by candice*

**dynamics**

cars A and B are d=60m apart and traveling respectively with constant speeds v1=32km/h and v2=24km/h on an ice covered road.knowing that 45s after driver A apples his breaks to avoid overtaking car Bthe two cars collide,determine a)the uniform deceleration of car A b)the ...
*October 8, 2012 by rajesh*

**PHYSICS**

The roller coaster in the figure below starts with a velocity of 17 m/s. One of the riders is a small girl of mass 31 kg. Find her apparent weight when the roller coaster is at locations B and C. At these two locations, the track is circular, with the radii of curvature given ...
*October 13, 2013 by Anon C*

**Physics - Conducting Rails**

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

**Physics!!**

A car moving at 16.0 m/s, passes an observer while its horn is pressed. Find the difference between the frequencies of sound heard when the car approaches and when it recedes from the stationary observer. The velocity of sound is 343 m/s and the frequency of the sound of the ...
*April 4, 2009 by sophie*

**Physics**

At time t = 0, a hockey puck is sent sliding in the +x direction over a frozen lake, directly into a strong wind. Figure 2-13 gives the velocity v of the puck versus time, as the puck moves along a single axis. (The time axis is marked in increments of 1.0 s.) At t = 10. s, ...
*September 26, 2010 by Lily*

**Physics**

At time t = 0, a hockey puck is sent sliding in the +x direction over a frozen lake, directly into a strong wind. Figure 2-13 gives the velocity v of the puck versus time, as the puck moves along a single axis. (The time axis is marked in increments of 1.0 s.) At t = 10. s, ...
*September 26, 2010 by Lily*

**physics**

A ball of mass Ml = 0.250 kg and velocity V01 = +5.00 m/s (see Figure) collides head-on with a ball of mass M2 = 0.800 kg that is initially at rest. No external forces act on the balls. a) What was the kinetic energy of the first ball before the collision; b) If the collision ...
*May 21, 2011 by Fabiana*

**physics**

An 8 g bullet is shot into a 4.0 kg block, at rest on a frictionless horizontal surface. The bullet remains lodged in the block. The block moves into a spring and compresses it by 3.7 cm. The force constant of the spring is 2500 N/m. In the figure, the initial velocity of the ...
*March 31, 2014 by Georgey*

**physics**

001 (part 1 of 2) 10.0 points An 86 kg fullback moving east with a speed of 5.5 m/s is tackled by a 97 kg opponent running west at 3.6 m/s, and the collision is perfectly inelastic. a) What is the velocity of the players immediately after the tackle? Answer in units of m/s. ...
*January 5, 2010 by Anonymous*

**college physics**

While standing on a bridge 15.0 m above the ground, you drop a stone from rest. When the stone has fallen 3.10 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach the ground at the same instant? Take the ...
*January 31, 2010 by tina*

**college physics**

While standing on a bridge 15.0 m above the ground, you drop a stone from rest. When the stone has fallen 3.10 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach the ground at the same instant? Take the ...
*January 31, 2010 by tina*

**physics**

While standing on a bridge 18.5 m above the ground, you drop a stone from rest. When the stone has fallen 2.80 m, you throw a second stone straight down. What minimal initial velocity must you give the second stone if they are both to reach the ground at the same instant? Take...
*February 7, 2011 by shaknocka*

**Physics**

When the dried up seed pod of a scotch broom plant bursts open, it shoots out a seed with an initial velocity of 2.2 m/s at an angle of 60.0° above the horizontal. If the seed pod is 0.8 m above the ground, how long does it take for the seed to land? (Neglect air resistance.) ...
*July 5, 2011 by Blair*

**physics**

A 700-N man jumps out of a window into a fire net 10 m below. The net stretches 2 m before bringing the man to rest and tossing him back into the air. What is the spring constant of the net? What is the velocity just before hitting the net? (hint: Use cons. of energy twice)
*August 10, 2011 by yo*

**physics**

A rock is projected from the edge of the top of a building with an initial velocity of 19.6 m/s at an angle of 31 degrees above the horizontal. The rock strikes the ground a horizontal distance of 77 m from the base of the building. The acceleration of gravity is 9.8 m/s^2.(...
*November 1, 2011 by Julia*

**physics**

Two identical cannons fire cannonballs horizontally with the same initial velocity. One cannon is located on a platform partway up a tower, and the other is on top, four times higher than the first cannon. How much farther from the tower does the cannonball from the higher ...
*June 15, 2012 by daniel*

**Physics**

While standing on a bridge 19.1 m above the ground, you drop a stone from rest. When the stone has fallen 3.40 m, you throw a second stone straight down. What minimal initial velocity must you give the second stone if they are both to reach the ground at the same instant? Take...
*September 9, 2012 by jhockens*

**Physics**

While standing on a bridge 18.3 m above the ground, you drop a stone from rest. When the stone has fallen 2.60 m, you throw a second stone straight down. What minimal initial velocity must you give the second stone if they are both to reach the ground at the same instant? Take...
*September 9, 2012 by jhockens*

**Physics**

As part of a physics experiment, you stand on a bathroom scale in an elevator. Though your normal weight is 690 N, the scale at the moment reads 588 N. (a) Is the acceleration of the elevator upward, downward, or zero? (b) Calculate the magnitude of the elevator's acceleration...
*November 2, 2012 by James*

**physics **

In a game against the White Sox, baseball pitcher Nolan Ryan threw a pitch measured at 34.4 m/s. If it was 18.4 m from Nolan's position on the pitcher's mound to home plate, how long did it take the ball to get to the batter waiting at home plate? Treat the ball's velocity as ...
*September 6, 2013 by chris *

**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 and ...
*January 10, 2014 by Lisa *

**Physics**

A railroad car with a mass of 12400 kg collides and couples with a second car of mass 18700 kg that is initially at rest. The first car is moving with a speed of 7.7 m/s prior to the collision. (a) What is the initial momentum of the first car? (b) If external forces can be ...
*July 7, 2014 by Anonymous*

**physics**

A rod with length L and mass m stand on a frictionless table. a ball with mass m and speed u cimped perpendicular to the rod a distance x from the bottom of the rod and sticks to it. what is the angular velocity of the rod+ball after the collison? I need help on how to solve ...
*January 27, 2015 by david*

**physics **

In a game against the White Sox, baseball pitcher Nolan Ryan threw a pitch measured at 44.8 m/s. If it was 18.4 m from Nolan's position on the pitcher's mound to home plate, how long did it take the ball to get to the batter waiting at home plate? Treat the ball's velocity as ...
*February 8, 2015 by Ava*

**physics**

A car's wheel of radius r=50cm goes through 5000rev in 1min. find the car's average angular velocity,and how far it travels along the ground in 1min. The linear speed v and angular speed w of the point of a rotating body are connected by the equation v=wr. where r is the ...
*March 10, 2015 by Sarah*

**Physics**

At the entrance channel of a harbor, the tidal current has a velocity of 4.94 km/hr in a direction 23.2° south of east. Suppose a ship caught in this current has a speed of 15.6 km/hr relative to the water. If the helmsman keeps the bow of the ship aimed north, what will be ...
*October 16, 2007 by Lindsay*

**Physics**

At the entrance channel of a harbor, the tidal current has a velocity of 4.94 km/hr in a direction 23.2° south of east. Suppose a ship caught in this current has a speed of 15.6 km/hr relative to the water. If the helmsman keeps the bow of the ship aimed north, what will be ...
*October 18, 2007 by Lindsay*

**Physics**

At the entrance channel of a harbor, the tidal current has a velocity of 4.94 km/hr in a direction 23.2° south of east. Suppose a ship caught in this current has a speed of 15.6 km/hr relative to the water. If the helmsman keeps the bow of the ship aimed north, what will be ...
*October 18, 2007 by Lindsay*

**Physics**

I am having some trouble with some questions and need some help. A neutron with a mass of 1.68 x10(-27) exponent kg moves from a nuclear reactor with a velocity of 3.22 x10 (3) exponent m/s. What is the Broglie wavelength? Also, I need to write tge complete electron ...
*December 4, 2009 by Doly V*

**helpp in physics! so tough!**

A diver springs upward with an initial speed of 2.0 m/s from a 2.5-m board. Find the velocity with which he strikes the water. Hint: When the diver reaches the water, his displacement is y = -2.5 m (measured from the board), assuming that the downward direction is chosen as ...
*September 28, 2010 by MC*

**science , physics**

A person is riding a bicycle, and its wheels have an angular velocity of +15.5 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is +15.5 revolutions. (a) How much time does it take for the ...
*November 3, 2010 by Anonymous*

**Physics**

In a cathode ray tube, electrons initially at rest are accelerated by a uniform electric field of magnitude 4.71 x 105 N/C during the first 5.49 cm of the tube's length; then they move at essentially constant velocity another 47.9 cm before hitting the screen. Find the speed ...
*January 24, 2012 by Ashley *

**Physics**

In a cathode ray tube, electrons initially at rest are accelerated by a uniform electric field of magnitude 4.71 x 105 N/C during the first 5.49 cm of the tube's length; then they move at essentially constant velocity another 47.9 cm before hitting the screen. Find the speed ...
*January 25, 2012 by Megan*

**Physics**

In a cathode ray tube, electrons initially at rest are accelerated by a uniform electric field of magnitude 4.71 x 105 N/C during the first 5.49 cm of the tube's length; then they move at essentially constant velocity another 47.9 cm before hitting the screen. Find the speed ...
*January 26, 2012 by jason*

**physics**

a 2.00kg copper plate with an initial temperature of 20.0 degrees Celsius slides with a constant velocity down a 150m long surface that is inclined at 30 degrees angle to the horizontal. If the mechanical energy lost by the system due to friction is absorbed by the copper to ...
*November 25, 2012 by HELPME!♥*

**mechanical science**

10. A car is moving in a straight line starts from rest, accelerates uniformly at 12 m/s2 for the first 5s, then travels at uniform speed for the next 2s and finally decelerates uniformly at 4 m/s2 for the next 5s. Draw the acceleration-time graph, velocity-time graphs and ...
*December 20, 2012 by anshuman kumar*

**Physics**

In a target shooting game, wooden blocks are thrown into the air and shot in flight. A block of 0.8kg has a speed of 10 m/s at the top of its trajectory when it is hit by a bullet from below at an angel 60° from horizontal. The mass of the bullet is 5.0 g and its speed is 550m...
*March 4, 2013 by Mike*

**Physics**

In a target shooting game, wooden blocks are thrown into the air and shot in flight. A block of 0.8kg has a speed of 10 m/s at the top of its trajectory when it is hit by a bullet from below at an angel 60° from horizontal. The mass of the bullet is 5.0 g and its speed is 550m...
*March 4, 2013 by Mike*

**physics**

a satellite completes one revolution of a planet in almost exactly one hour. at the end of an hour , the satellite has traveled 2.0x10^7 meters and is only 10 meters away from its starting point. What is the numerical value of the satellite's average velocity after that one hour?
*May 19, 2012 by Anonymous*

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