Wednesday

December 7, 2016
**physics**

a cart if weight 25 N is released at the top of an inclined plane of length 1m, which makes an angle of 30 degree with the ground. It rolls down the plane and hits another cart of weight 40 N at the bottom of the incline. Calculate the speed of the first cart at the bottom of ...

*Wednesday, September 23, 2015 by ancy*

**Physics**

A fast, measured pitched baseball left the pitcher's hand at a speed of 48.6 m/s. The pitcher was in contact with the ball over a distance of 1.44 m and produced constant acceleration. I know that t=(Vf-Vi)/a based on a kinematic equation. Also, I setup: 1.44=Vi(t) + 0.5at...

*Wednesday, September 23, 2015 by Skylar*

**AP Physics **

A baseball player throwing the ball from the outfield usually allows it to take one bounce on the theory that the ball arrives sooner this way. Suppose that ball hits the ground at an angle θ and then bonuses but loses half of its speed. A. Assuming that the ball is ...

*Tuesday, September 22, 2015 by Rachel *

**Physics**

A boy sledding down a hill accelerates at 2.33 m/s2 . If he started from rest, in what distance would he reach a speed of 8.70 m/s? Answer in units of m

*Tuesday, September 22, 2015 by Nadeen*

**physics**

A bullet is fired straight up from a gun with a muzzle velocity of 217 m/s. Neglecting air resistance, what will be its displacement after 9 s? The acceleration of gravity is 9.8 m/s2 .

*Tuesday, September 22, 2015 by pedro*

**Physics(volume flow rate)**

Imagine a house with two bathrooms/showers: one downstairs, the other upstairs. The volume flow rate of the shower head downstairs (2 meters above the ground level) is 4*10-4 m3/s. The cross sectional area of the shower head is 30 mm2. What is the volume flow rate of an ...

*Tuesday, September 22, 2015 by Jason*

**Physics (density)**

A steel drum (barrel) has a volume of 200 Liters and a mass of 16 kg. It is filled to the top with an unknown liquid, sealed and thrown into water. It is floating with 50% of its volume underwater. What is the density of the liquid inside the drum? Assume the walls of the drum...

*Tuesday, September 22, 2015 by Jason*

**Physics**

Basically... distance is 4 km Takes 4 min to go down river Takes 6 min to come up How fast is the river?

*Tuesday, September 22, 2015 by Eric *

**Physics**

A 6.08 kg box sits on a ramp that is inclined at 37.4 ∘ above the horizontal. The coefficient of kinetic friction between the box and the ramp is 0.30. What horizontal force is required to move the box up the incline with a constant acceleration of 4.30 m/s2 ?

*Tuesday, September 22, 2015 by Nicholas*

**physics**

A speeder driving down the road at a constant 20m/s passes a patrolman parked on the roadside. The patrolman waits 3 seconds then pursue the speeder accelerating at a constant 4m/s2. When does the patrolman catch the speeder

*Tuesday, September 22, 2015 by chelsea*

**Physics **

The tortoise and the hare are in a race of 1000m distance. The tortoise travels the entire race at a speed of 2.0 m/s while the rabbit runs the first 200 m @ 2.0 m/s. Then he stops to take nap for 1.3 hrs and awakens to finish the last 800m with an average speed of 3.0 m/s. ...

*Tuesday, September 22, 2015 by Karen*

**physics**

A block is at rest on the incline shown in the figure. The coefficients of static and kinetic friction are µs = 0.4 and µk = 0.34, respectively. The acceleration of gravity is 9.8 m/s. What is the largest angle which the incline can have so that the mass does not ...

*Tuesday, September 22, 2015 by king*

**Physics**

Suppose a rocket ship in deep space moves with constant acceleration equal to 9.80 m/s2, which gives the illusion of normal gravity during the flight. (a) If it starts from rest, how long will it take to acquire a speed 12% that of light, which travels at 3.0 × 108 m/s...

*Tuesday, September 22, 2015 by Jessica*

**PHYSICS**

1.)what is the magnitude of the force experienced by a proton moving at 3 km/s inside magnetic field of strength 0.05T 2.)an electron is moving at 2x10^5 m/s through a uniform magnetic field of 1.4x10^-3 T.what is the magnitude of magnetic force if the velocity of the electron...

*Tuesday, September 22, 2015 by Please! Anybody Help me.*

**Physics **

What are three different kinds of automatic switching devices? What are the conditions that cause the on/off action of the switch?

*Tuesday, September 22, 2015 by Grace*

**Physics**

Part A of this question asks for the sum of vector A = 3x+5y and vector B = 1x-3y. I did this and got the vector A + vector B = 4x+2y. Part B then asks what the magnitude and direction of vector A + vector B? The answer in the back of the textbook says that it is 4.5 at a 27 ...

*Tuesday, September 22, 2015 by Kendall*

**physics**

A giant bull running at 15 m/s slows at a rate of 2.4 meters per second per second. How long does it take it to stop?

*Tuesday, September 22, 2015 by ana*

**physics**

A bear spies some honey and takes off from rest, accelerating at a rate of 2.8 m/s^2. If the honey is 20m away, How fast will the bear be going when he gets to the honey?

*Tuesday, September 22, 2015 by ana*

**Physics **

Two small cars same weight travel towards each other red going 2.13 seconds/meter and blue going 2.99 seconds/meter at how many meters will they collide if one starts at 0 meters and one starts at 3.5 meters.

*Tuesday, September 22, 2015 by Nika*

**Physics**

A hose lying on the ground shoots a stream of water upward at an angle of 60deg. To the horizontal with a velocity of 16m/s . The height at which the water strikes the wall 8m away is?

*Tuesday, September 22, 2015 by Chaitanya*

**PHYSICS**

1.)what is the magnitude of the force experienced by a proton moving at 3 km/s inside magnetic field of strength 0.05T 2.)an electron is moving at 2x10^5 m/s through a uniform magnetic field of 1.4x10^-3 T.what is the magnitude of magnetic force if the velocity of the electron...

*Tuesday, September 22, 2015 by Tricia*

**Physics**

1.)what is the magnitude of the force experienced by a proton moving at 3 km/s inside magnetic field of strength 0.05T 2.)an electron is moving at 2x10^5 m/s through a uniform magnetic field of 1.4x10^-3 T.what is the magnitude of magnetic force if the velocity of the electron...

*Tuesday, September 22, 2015 by ROSE-Help Me Please PLEASE!!!!!*

**physics/algebra**

82.35 m = (0)t + 1/2(-9.8)t^2 t = 4.1 s is correct Could someone please walk me through this? I could not get an answer because of the negative (maybe my order of operations is wrong) I have no idea!

*Monday, September 21, 2015 by asher*

**physics**

You do a physics lab experiment on another planet. A small block is released from rest at the top of a long frictionless ramp that is inclined at an angle of 36.9° above the horizontal. You measure that a small block travels a distance 17.0 m down the incline in 8.60 s. ...

*Monday, September 21, 2015 by dianna li*

**Physics: Please help!**

I can't figure this out at all...Can someone please explain it to me? It has been claimed that an insect is the best jumper in the animal kingdom. This insect can accelerate at 3950 m/s2 over a distance of 2.3 mm as it straightens its legs. (a) Assuming a uniform ...

*Monday, September 21, 2015 by Claire*

**Physics**

Car A and B are facing each other at rest, 100 m apart. Car A accelerates at 5 m/s^2. Car B accelerates at 3 m/s^2. When and where do they meet?

*Monday, September 21, 2015 by Steven*

**Physics**

A boat travels across a wide river. if the boat can travel at a speed of 25 mph and its pilot heads in a direction of 30 degrees, while the current's velocity is 5.1 mph at a heading of 270 degrees, what will the final velocity of the boat be?

*Monday, September 21, 2015 by Lindsey*

**Physics**

I cannot figure out this question, and it would be greatly appreciated if someone could help me out! :) It has been claimed that an insect is the best jumper in the animal kingdom. This insect can accelerate at 3950 m/s2 over a distance of 2.3 mm as it straightens its legs. (a...

*Monday, September 21, 2015 by Claire*

**physics**

Help! A train flies 2000km at a bearing of 145° and again 500km at bearing of 270°. Calculate displacement

*Monday, September 21, 2015 by Merriam*

**Physics**

You shoot an arrow straight ahead; it leaves your bow moving parallel to the ground. You find it embedded in the ground 50m away from where you shot it. It makes an 82 degree angle with the level ground , reflecting the direction it was traveling at the time it hit. How fast ...

*Monday, September 21, 2015 by Chris*

**physics**

Another scheme to catch the roadrunner has failed. A safe falls from rest the top of a 30.2 m high cliff toward Wiley Coyote, who is standing at the base. Wiley first notices the safe after it has fallen 17.4 m. How long does he have to get out of the way? The acceleration of ...

*Monday, September 21, 2015 by luma*

**physics**

A ball is thrown upward. What is its time interval between the release of he ball and the time it reaches its maximum height? Its initial vertical speed is 9 m/s and the acceleration of gravity is9.8 m/s^. Neglect air resistance. Answer in units of s.

*Monday, September 21, 2015 by luma*

**physics**

the tallest volcano in the solar system I the 23 km tall Martian volcano, Olympus Mons. An astronaut drops a ball off the rim of the crater and that he fee fall acceleration of the ball remains constant throughout he ball's 23 km fall at a value of 3.3 m/^. (We assume that...

*Monday, September 21, 2015 by luma*

**physics**

1)Johnny Football throws a football straight up in the air. It travels to a maximum height of 7.1 m. It then falls and is caught at the exact location where it was released 2.4 seconds later. a) What was the ball's average speed during this entire toss? b) What was the ...

*Monday, September 21, 2015 by Anonymous*

**physics**

A uniform circular disk of mass 24.0 g and radius 40.0 cm hangs vertically from a fixed, frictionless, horizontal hinge at a point on its circumference. A horizontal beam of electromagnetic radiation with intensity 10.0 MW/m2 is incident on the disk in a direction ...

*Monday, September 21, 2015 by theo*

**Physics**

An object is released from rest and falls in free fall motion. The speed v of the object after it has fallen a distance y is given by v2 = 2gy. In an experiment, v and y are measured and the measured values are used to calculate g. If the percent uncertainty in the measured ...

*Monday, September 21, 2015 by Anonymous*

**Physics**

A small block travels up a frictionless incline that is at an angle of 30.0° above the horizontal. The block has speed 4.21 m/s at the bottom of the incline. Assume g = 9.80 m/s2. How far up the incline (measured parallel to the surface of the incline) does the block ...

*Monday, September 21, 2015 by Anonymous*

**Physics**

A small block is released from rest at the top of a long frictionless ramp that is inclined at an angle of 36.9° above the horizontal. You measure that a small block travels a distance 12.0 m down the incline in 8.20 s. What is the value of g, the acceleration due to ...

*Monday, September 21, 2015 by Anonymous*

**Physics**

A small block is released from rest at the top of a long frictionless ramp that is inclined at an angle of 36.9° above the horizontal. You measure that a small block travels a distance 12.0 m down the incline in 8.20 s. What is the value of g, the acceleration due to ...

*Monday, September 21, 2015 by Karlie*

**physics **

A stone is projected vertically upwards with velocity 40m/show that the stone will reach the point of projection with the same velocity

*Monday, September 21, 2015 by samod*

**Physics**

An artillery shell is launched on a flat, horizontal field at an angle of α = 36.2° with respect to the horizontal and with an initial speed of v0 = 318 m/s. What is the horizontal distance covered by the shell after 7.68 s of flight? I'm confused on how to even ...

*Monday, September 21, 2015 by Amber*

**physics-heat transfer-urgent pls**

Calculate the energy absorbed when 8.5g of ice is melted at 0 Celsius. thank you

*Monday, September 21, 2015 by happy *

**Physics **

John takes off running towards his house that is 6 meters away. His initial velocity is 2m/s. How long will it take John to get to his hose (his orgin)? What if his house was 15 meters away?

*Monday, September 21, 2015 by Hilary*

**College Physics**

A snowball off a roof that slopes downward at an angle of 40degrees. The edge of the roof is 14 m above the ground and the snowball has a speed of 8 m/s as it rolls off the edge of the roof. If a 1.8 m tall man is standing 4 m from the top of the edge of the roof, will he be ...

*Monday, September 21, 2015 by Bryan*

**Physics**

A snowball off a roof that slopes downward at an angle of 40degrees. The edge of the roof is 14 m above the ground and the snowball has a speed of 8 m/s as it rolls off the edge of the roof. If a 1.8 m tall man is standing 4 m from the top of the edge of the roof, will he be ...

*Monday, September 21, 2015 by Bryan*

**Physics**

A thin uniform rod of length 2m is bent at 90 degree angle from the mid point . find the centre of mass of bent road

*Monday, September 21, 2015 by Anonymous*

**Physics**

A thin uniform rod of length 2m is bent at 90 degree angle from the mid point . find the centre of mass of bent road

*Monday, September 21, 2015 by Anonymous*

**physics**

How much heat is needed to convert 1.0kg ice at -5celsius to steam at 105 celsius?

*Monday, September 21, 2015 by happy *

**physics**

Calculate the energy absorbed when 8.5g of ice is melted at 0 celsius

*Monday, September 21, 2015 by happy *

**physics **

A student observes an airplane fly overhead with a constant velocity parallel to the x-axis at a height of 7.60 × 103 m. At time t = 0 the airplane is directly above the student, the vector P~ o = 7.60 × 103ˆj m describes the position on the airplane with ...

*Monday, September 21, 2015 by simon *

**physics**

how long will it take for a car to accelerate to come to a stop if it is traveling at 20 m/s and the car has a maximum deceleration of 6 m/s squared? So far I think im supposed to do 6-20/26

*Monday, September 21, 2015 by anonymous*

**Physics**

How high will you be when you stop rising if you jump upward with an initial vertical speed of 2 m/s? Answer to the nearest 0.1 m, and use g = 9.80 m/s2.

*Monday, September 21, 2015 by Emey*

**Physics**

A force F1 of magnitude 6.90 units acts on an object at the origin in a direction θ = 54.0° above the positive x-axis. (See the figure below.) A second force F2 of magnitude 5.00 units acts on the object in the direction of the positive y-axis. Find graphically the ...

*Sunday, September 20, 2015 by Jennifer*

**physics **

Knowing that in most all movement situations the mass of the system stays constant, how do you get the momentum of a system to change?

*Sunday, September 20, 2015 by kat*

**physics **

Add the following vectors: 440 N at 100 degrees 905 N at 160 degrees A.1187.7 N at 128.7 degrees B.1010.4 N at 48.2 degrees C.1345 N at 130 degrees D.1013.5 N at 149 degrees

*Sunday, September 20, 2015 by kat*

**physics **

Convert the resultant vector into its x and y components. 225 N at 12 degrees A.(222.3 N, 37.4 N) B(201.1 N, 10.8 N) C.(45.8 N, 201.1 N) D.(220.1 N, 46.8 N)

*Sunday, September 20, 2015 by john *

**physics**

When a 0.106 kg mass is suspended at rest from a certain spring, the spring stretches 3.50 cm. Find the instantaneous acceleration of the mass when it is raised 5.20 cm, compressing the spring 1.70 cm.

*Sunday, September 20, 2015 by john*

**Physics **

A 17.8 kg block is dragged over a rough, horizontal surface by a constant force of 72.8 newtons acting at an angle of 31.3 degrees above the horizontal. the block is displaced 64.4 m and the coefficient of kinetic friction is 0.239. find the work done by the 72.8 n force. ...

*Sunday, September 20, 2015 by Giana*

**Physics**

A boy weighing 3.9 102 N jumps from a height of 2.15 m to the ground below. Assume that the force of the ground on his feet is constant. a) Compute the force of the ground on his feet if he jumps stiff-legged, the ground compresses 1.80 cm, and the compression of tissue and ...

*Sunday, September 20, 2015 by Stacey*

**Physics-HELP**

An airplane is traveling 775 km/h in a direction 42.5° west of north (Figure 3-31). (a) Find the components of the velocity vector in the northerly and westerly directions. northerly km/h westerly km/h (b) How far north and how far west has the plane traveled after 3.00 h...

*Sunday, September 20, 2015 by Manny*

**Physics**

A sustained force of 44 N moves a model airplane 10 m along its runway to provide the required speed for takeoff. Find the kinetic energy at takeoff.

*Sunday, September 20, 2015 by Genesis*

**Physics**

a box weighing 800n is dragged across a level floor at a constant speed under the influence of a 60n applied force.What is the coefficient of sliding friction between the box and the floor?

*Sunday, September 20, 2015 by Lyd*

**physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 6.27 m/s. The car is a distance d away. The bear is 32.1 m behind the tourist and running at 9.06 m/s. The tourist reaches the car safely. What is the maximum possible value for d?

*Sunday, September 20, 2015 by Hannah*

**physics**

A fire fighter is trying to shoot water straight to the window located at the second floor of a house 6 m above the ground. The distance between the fire fighter and the house is 8 m and he holds the fire hose 1.8 m above the ground. The water leaves the hose with a constant ...

*Sunday, September 20, 2015 by Phillip*

**Physics**

10. A military jet flies horizontally with a velocity of 450 m/s and 20,000 m above the ground. When the jet is straight above an artillery gun a shell is fired. Assuming the shell hits the jet. a. Calculate the horizontal component of the initial velocity of the shell. b. ...

*Sunday, September 20, 2015 by Zachary Star*

**Physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.34 m. The stones are thrown with the same speed of 9.35 m/s. Find the location (above the base of the ...

*Sunday, September 20, 2015 by Hannah*

**Physics**

a driver of a car traveling at 17.3 m/s applies the brakes causing a uniform deceleration of 2.8m/s^2. How long does it take the car to accelerate to a final speed of 13.5 m/s?

*Sunday, September 20, 2015 by Tytiana*

**AP Physics I**

A placekicker is about to kick a field goal. The ball is 26.6 m from the goal post. The ball is kicked with an initial velocity of 19.0 m/s at an angle θ above the ground. Between what two angles, θ1 and θ2, will the ball clear the 2.8-m-high crossbar? (Hint: ...

*Sunday, September 20, 2015 by Matt*

**Physics-HELP**

An Olympic long jumper is capable of jumping 7.5 m. Assume that his horizontal speed is 8.8 m/s as he leaves the ground. How long is he in the air? How high does he go? Assume that he lands standing upright, that is, the same way he left the ground.

*Sunday, September 20, 2015 by Manny*

**Physics **

A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 56.3 ° above the horizontal. The rocket is fired toward an 11.0-m high wall, which is located 21.5 m away. The rocket attains its launch speed in a negligibly short period of time, after which its ...

*Sunday, September 20, 2015 by Physisc Help*

**physics**

what is the pressure on the bottom of an aquarium 0.3 m deep filled with water

*Sunday, September 20, 2015 by cath*

**Physics**

a student sees a ball fall from the third floor of a building and notes that it takes 2.50 s for the ball to fall the last half of the way to the ground. What is the height of the building?

*Sunday, September 20, 2015 by Liselotte*

**physics**

A truck starts from the rest and moves with a accelaration 1.5m/s^2 ,at the same time a car which is 150m behind the truck starts from the rest with an accelaration of 2m/sec^2. Find the time which the car will overtake the truck and the distance travel.

*Sunday, September 20, 2015 by Afreed *

**Physics **

Calculate the height through which a crane can lift a load of 4 ton when it's motor of 4 H.P operates for 10 sec. Acceleration due to gravity is 10 m/s2

*Sunday, September 20, 2015 by Sarthak *

**Physics**

A hammer is thrown horizontally from the flat roof of a tall building at a velocity of 10m/s and hits the ground below after 5 seconds. (a) How high is the roof? (b) How far from the building does it land.

*Sunday, September 20, 2015 by Heinnrick*

**Physics**

A 0.340 kg particle moves in an xy plane according to x(t) = -15.00 + 2.00t - 4.00t3 and yet) = 25.00 + 7.00t - 9.00t2, with x and y in meters and t in seconds. At t = 0.700 s, what are (a) the magnitude and (b) the angle (relative to the positive direction of the x axis) of ...

*Sunday, September 20, 2015 by Haad*

**Physics **

A married couple is driving on a dark road at night at the rate of 98.0 m/s until they see a clown 50m in front of them and slam the brakes to slow the car down to 10.0m/s and still manage to hit the clown. How much time would the clown have had to move before being roadkill? ...

*Sunday, September 20, 2015 by Tiffany *

**physics**

A 15-V battery is hooked up to three resistors in series. The voltage drop across the first resistor is 3V and the voltage drop across the sencond resistor is 10V. What is the voltage drop across the last resistor? I don't understand what equation to do for this problem. ...

*Saturday, September 19, 2015 by Grace *

**physics**

A rocket is fired at an angle from the top of a tower of height h0 = 65.5 m . Because of the design of the engines, its position coordinates are of the form x(t)=A+Bt2 and y(t)=C+Dt3, where A, B, C , and D are constants. Furthermore, the acceleration of the rocket 1.50 s after...

*Saturday, September 19, 2015 by justin*

**Physics**

The mass of a satellite is 2 Kg. Assuming that the mass is evenly distributed throughout the satellite, calculate the moments of inertia about the X, Y and Z axes.

*Saturday, September 19, 2015 by Darrin*

**physics **

Vector A has magnitude 8.0 units at an angle of 60o from the x-axis. Vector B has magnitude 6.0 at an angle of -30o from the x-axis. Find the magnitude and direction of vector C = A + B I tried actually drawing it to see if it would help but it didn't I'm pretty sure ...

*Saturday, September 19, 2015 by JOHN SMITH*

**Physics**

When a 0.111 kg mass is suspended at rest from a certain spring, the spring stretches 3.90 cm. Find the instantaneous acceleration of the mass when it is raised 6.20 cm, compressing the spring 2.30 cm.

*Saturday, September 19, 2015 by Stacey*

**physics**

100 kg car moving at 22 m/s runs into a horizontal spring with spring constant 4200 N/m. How far does the car displace the spring before coming to a stop? Please show your work.

*Saturday, September 19, 2015 by Brandi*

**physics**

A man drops a stone into a water well on his farm. He hears the sound of the splash 3.55 s later. How deep is the well? The acceleration due to gravity is 9.8 m/s 2 and the speed of sound in air is 324 m/s. Answer in units of m Vo= something V= 324 m/s?? a= 9.8 m/s^2 t= 3.55 s...

*Saturday, September 19, 2015 by Anonymous*

**physics**

A 1100 kg car accelerates from rest to 27 m/s in 6.0 seconds. Neglecting friction, hat is the average power consumption in horsepower?

*Saturday, September 19, 2015 by Brandi*

**Physics**

Using GRAPHICAL METHOD, find the vector sum of a force of 20 N directed 60 degrees east of north and a force of 60 N directed west? Please show all steps and equations used.

*Saturday, September 19, 2015 by Alyssa*

**Physics**

Police find skid marks 65.0 m long on a highway showing where the car made an emergency stop. Assuming the acceleration was -10.3 m/s^ ( about the maximum for dry pavement) how fast was the car going?

*Saturday, September 19, 2015 by Tyler*

**Physics**

Maria throws a ball straight up with an initial velocity of 10 m/s. What is its velocity at the highest point? What is its velocity when it returned to the elevation from where it is thrown ? What is its acceleration at the highest point? What is its acceleration just before ...

*Saturday, September 19, 2015 by Joyce*

**Science- Physics**

Two plane mirrors, A and B, are separated by 30.0 cm facing each other. An object is placed 20 cm from mirror A. Locate the first two nearest image formed by each mirror.

*Saturday, September 19, 2015 by trsgts*

**Science- Physics**

A plane mirror is mounted at the back of the truck that is moving at 25 km/h. How fast does the image of a man standing on the road seem to be moving away from him?

*Saturday, September 19, 2015 by trsgts*

**PHYSICS**

3 PARTICLES OF MASS 1KG,2KG,3KG PLACED AT CORNER A,B,C OF AN EQUILARERA TRIANGLE A,B AND C.LOCATE THE POSITION OF PARTICLE/FIND COORDINATES

*Saturday, September 19, 2015 by ARYAN *

**Physics**

If the electric field inside a capacitor exceeds the dielectric strength of the dielectric between its plates, the dielectric will break down, discharging and ruining the capacitor. Thus, the dielectric strength is the maximum magnitude that the electric field can have without...

*Saturday, September 19, 2015 by Anonymous*

**Physics**

A 11.0-µF capacitor and a 50.0-µF capacitor are charged by being connected across separate 55.0-V batteries. (a) Determine the resulting charge on each capacitor. (b) The capacitors are then disconnected from their batteries and connected to each other, with each ...

*Saturday, September 19, 2015 by Nick*

**physics**

In college softball, the distance from the pitcher's mound to the batter is 43 feet. If the ball leaves the bat at 105 mph, how much time elapses between the hit and the ball reaching the pitcher? I figured out how many ft there would be in a second, but I'm not so ...

*Friday, September 18, 2015 by Laura*

**Physics **

A boy threw a rock straight down from a tree top with a velocity of 5.00 m/s. If the rock struck the ground below 1.80 s later, what was its velocity at this time?

*Friday, September 18, 2015 by Kali*

**Physics**

Two airplanes leave an airport at the same time. The velocity of the first airplane is 730 m/h at a heading of 44.6 degrees. The velocity of the second is 610 m/h at a heading of 100 degrees. How far apart are they after 2.3 h? Answer in units of m.

*Friday, September 18, 2015 by Jeff*

**Physics**

An airplane flies at an airspeed of 445km/hr. The pilot wants to fly 785km to the north. She knows that she must head 18.0° east of north to fly directly there. If the plane arrives in 1.97hr, find the magnitude of the wind velocity vector.

*Friday, September 18, 2015 by Lash*

**Physics**

A ball on the end of a string is whirled around in a horizontal circle of radius 0.300m. The plane of the circle is 1.19m above the ground. The string breaks and the ball lands 1.91m (horizontally) away from the point on the ground directly beneath the ball's location when...

*Friday, September 18, 2015 by Lash*

**Physics**

A river flows with a uniform velocity v. A person in a motorboat travels 1.21km upstream, at which time she passes a log floating by. Always with the same throttle setting, the boater continues to travel upstream for another 52.6min and then returns downstream to her starting ...

*Friday, September 18, 2015 by Lash*

**Physics**

A child in danger of drowning in a river is being carried downstream by a current that has a speed of 2.60km/h. The child is 0.615km from shore and 0.815km upstream of a boat landing when a rescue boat sets out. If the boat proceeds at its maximum speed of 21.2km/h relative to...

*Friday, September 18, 2015 by Lash*