Thursday

November 26, 2015
**physics**

A rocket is fired at a speed of 66.0 m/s from ground level, at an angle of 63.0 ° above the horizontal. The rocket is fired toward an 31.2-m high wall, which is located 28.0 m away. The rocket attains its launch speed in a negligibly short period of time, after which its ...
*Friday, September 11, 2015 by amanda*

**physics**

A swimmer, capable of swimming at a speed of 1.18 m/s in still water (i.e., the swimmer can swim with a speed of 1.18 m/s relative to the water), starts to swim directly across a 2.16-km-wide river. However, the current is 1.19 m/s, and it carries the swimmer downstream. (a) ...
*Friday, September 11, 2015 by amanda*

**physics**

A mountaintop is a height y above the level ground. A woman measures the angle of elevation of the mountaintop to be θ when she is a horizontal distance x from the mountaintop. After walking a distance d closer to the mountain, she measures the angle of elevation of the ...
*Friday, September 11, 2015 by jasleen*

**Physics**

A pilot flying low and slow drops a weight; it takes 2.8 s to hit the ground, during which it travels a horizontal distance of 100 m . Now the pilot does a run at the same height but twice the speed. How much time does it take the weight to hit the ground? How far does it ...
*Friday, September 11, 2015 by Lina*

**Physics**

An object travels with a constant acceleration for 10 s. The vectors in Figure 3-41 represent the final and initial velocities. carefully graph the x component of the velocity versus time, the y component of the velocity versus time and the y component of the acceleration ...
*Friday, September 11, 2015 by Alyssa*

**Physics. Help Please**

Gabriele enters an east-w straight bike path at the 3.0-km mark and rides w at a constant speed of 8.0 m/s. At the same time, Xena rides east from the1.0-km mark at a constant speed of 6.0 m/s. 1. Write function x(t) that describe the position of Gabriele as a function of time...
*Friday, September 11, 2015 by Matt*

**Physics**

An object travels with a constant acceleration for 10 s. The vectors in Figure 3-41 represent the final and initial velocities. carefully graph the x component of the velocity versus time and the y component of the acceleration versus time, in a Vx vs t graph, a Vy vs t graph ...
*Friday, September 11, 2015 by Alyssa*

**physics**

a man can swim in still water At 5 km/h . in order to cross the river through shortest path , at what approximate angle he should swim at, with the upstrem ?
*Friday, September 11, 2015 by Akansha*

**physics **

Two springs have force constant K1&K2 (K1>K2) .each spring is extended by same farce F. If their elastic potential energy are E1&E2then E1/E2)is?
*Friday, September 11, 2015 by Bn sharma*

**Physics **

During an all-night cram session, a student heats up a 0.360 liter (0.360 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 18.1 °C, and the beaker is filled to the brim. A short time later when the student returns, the temperature has risen to...
*Friday, September 11, 2015 by can anyone help me with this *

**Physics**

A treasure map instructs you to walk 27 m south, followed by 70 m east, then 64.5 m north, and finally 28.5 m east. Determine the magnitude of your total displacement, if you follow these instructions. Calculate the answer in meters (m) and rounded to three significant figures.
*Friday, September 11, 2015 by Anonymous*

**Physics**

To qualify for the finals in a racing event a car must achieve an average speed of 250 km/h on a track with a total length of 16,000 m if a particular car covers the first half of the track at an average speed of 230 km/h what minimum average speed Must It have in the second ...
*Thursday, September 10, 2015 by Aleksa*

**Physics**

A speed skater moving across frictionless ice at 8.3 m/s hits a 5.6 m -wide patch of rough ice. She slows steadily, then continues on at 6.5 m/s What is he acceleration on the rough ice?
*Thursday, September 10, 2015 by Caylee*

**Physics**

Calculate the total entropy change hat occurs when 2kg of lead at 40 degrees celcius are placed in a very large quantity of water at 10degrees celcius. the specific heat of lead is 0.031 cal/g K).
*Thursday, September 10, 2015 by Kelsey*

**physics- work **

what is the work required to raise a 10-kg bucket from a well 100-meter deep? Is this right? 10*9.8= 98N 98N*100= 9800J
*Thursday, September 10, 2015 by Anonymous*

**physics**

Which of the following does not involve a force? a.tug of war b.pushing a wagon c.riding a bike d.jumping e.None of the above f.towing a car g.hitting a ball Is the answer e. none of the above? I know a,b,c,d, and g exert a force, but I am not sure about f. towing a car.
*Thursday, September 10, 2015 by Anonymous*

**Physics Using hydrostatic equilbrium)**

3. A model of Earth’s interior: Look up the radius and mass of the Earth. Radius is 6,371 km Mass is 5.974 x 10^24 kg Calculate its average density. p_e = (5.974 x 10^24 kg)/ (4/3)pi r^3 = (5.974 x 10^24 kg)/ (4/3)pi (6371)^3 = 5.54 g/cm^3 Using this Imagine a planet of ...
*Thursday, September 10, 2015 by Jason*

**physics **

A ball is dropped from a helicopter which is descending at 1.5 m/s. After 2 seconds, what are a) the the velocity of the ball, and b) how far is the ball below the helicopter? c) & d) Repeat your calculations for a) and b) if the helicopter had been rising at 1.5 m/s instead.
*Thursday, September 10, 2015 by john smith*

**Physics**

The Space Shuttle travels at a speed of about 5.05 x 103 m/s. The blink of an astronaut's eye lasts about 93.5 ms. How many football fields (length = 91.4 m) does the Space Shuttle cover in the blink of an eye?
*Thursday, September 10, 2015 by Garren*

**Physics**

t a NASA research center free-fall research is performed by dropping experiment packages from the top of an evacuated shaft 156 m high. Free-fall imitates the so-called microgravity environment of a satellite in orbit. What constant acceleration would be required to stop an ...
*Thursday, September 10, 2015 by Ali*

**Physics (deriving Keplers 3rd law)**

How do I derive a straightforward form of Kepler's 3rd Law if I start with Newtons's Law of Gravitation. (the opposite of what Newton did)
*Thursday, September 10, 2015 by Jason*

**Physics**

The pressure in the room also increased when the temperature increased, because pressure is ___________ to temperature.
*Thursday, September 10, 2015 by Anonymous*

**physics**

In the (Figure 1) the coefficient of static friction between mass mA and the table is 0.42, whereas the coefficient of kinetic friction is 0.17. Ignore masses of the cord and the (frictionless) pulley. What minimum value of mA will keep the system from starting to move? What ...
*Thursday, September 10, 2015 by Allie*

**physics**

Two point charges of +30μC and -10μC are separated by a distance of 10cm. What is the magnitude of electric field due to these charges at a point midway between them? (k = 9 × 109 N · m2/C2)
*Thursday, September 10, 2015 by mike*

**Physics ( using earth to find pressure of planet y**

3. A model of Earth’s interior: Look up the radius and mass of the Earth. Radius is 6,371 km Mass is 5.974 x 10^24 kg Calculate its average density. p_e = (5.974 x 10^24 kg)/ (4/3)pi r^3 = (5.974 x 10^24 kg)/ (4/3)pi (6371)^3 = 5.54 g/cm^3 Imagine a planet of the same ...
*Thursday, September 10, 2015 by Kim*

**Physics**

A motor cyclist travelling at 12m/s decelerates at 3m/s square a) how long does he take to come to a rest b) how far does he travel in coming to rest
*Thursday, September 10, 2015 by Hannah*

**physics**

During an all-night cram session, a student heats up a 0.360 liter (0.360 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 18.1 °C, and the beaker is filled to the brim. A short time later when the student returns, the temperature has risen to...
*Thursday, September 10, 2015 by help*

**physics**

The human lungs can function satisfactorily up to a limit where the pressure difference between the outside and inside of the lungs is 1/21 of an atmosphere. If a diver uses a snorkel for breathing, how far below the water can she swim? Assume the diver is in salt water whose ...
*Thursday, September 10, 2015 by please help*

**PHYSICS**

A river is flowing from west to east at a speed of 8m/min, a man on the south bank of the river , capable of swimming at 20m/min in still water, wants to swim across the river in the shortest time. He should swim in a direction of a) due north b) 30 degree east of north c) 30 ...
*Thursday, September 10, 2015 by PRAJAKTA*

**Physics**

It takes you 7.1 min to walk with an average velocity of 2.4 m/s to the north from the bus stop to the museum entrance. How far did you walk? Answer in units of m.
*Thursday, September 10, 2015 by Anonymos *

**Physics**

The three displacement vectors in the drawing have magnitudes of A = 5.48 m, B = 5.23 m, and C = 4.75 m. Find the resultant ((a) magnitude and (b) directional angle) of the three vectors by means of the component method. Express the directional angle as an angle above the ...
*Wednesday, September 9, 2015 by joe*

**Physics ( Thickness of a Spherical Shell)**

Aluminum floater: A spherical shell with an outer radius R=2 cm is made of aluminum (mass density of Al is 2.7 g/cm3). How thick is the shell if the average density of the spherical object is exactly 0.5 g/cm3 ? Assume there is a vacuum in the hollow interior of the shell. ...
*Wednesday, September 9, 2015 by JC*

**PHysics**

An athlete crosses a 21 m wide river by swimming perpendicular to the water current at a speed of 1.1 m/s relative to the water. How fast is the water in the river flowing with respect to the ground in m/s?
*Wednesday, September 9, 2015 by Seth *

**physics**

After flying for 13 min in a wind blowing 44 km/h at an angle of 21° south of east, an airplane pilot is over a town that is 53 km due north of the starting point. What is the speed of the airplane relative to the air?
*Wednesday, September 9, 2015 by Help*

**physics**

A 4.30 kg block is pushed along a floor by a constant applied force that is horizontal and has a magnitude of 43.0 N. The figure gives the block's speed v versus time t as the block moves along an x axis on the floor. The scale of the figure's vertical axis is set by ...
*Wednesday, September 9, 2015 by rochelle*

**Physics**

A car travels along a straight stretch of road. It proceeds for 16.1 mi at 56 mi/h, then 24 mi at 46 mi/h, and finally 36.9 mi at 37.3 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h.
*Wednesday, September 9, 2015 by Isabelle*

**Physics **

In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.0854 s, during which time it experiences an acceleration of 217 m/s2. The ball is launched at an angle of 58.3° above the ground. Determine the (a) horizontal ...
*Wednesday, September 9, 2015 by Annie*

**Physics**

For chlorine gas, the van der Waals constants are: a = 0.658 J·m3/mol2, and b = 5.62 × 10-5 m3/mol. A 3.0-L tank contains 10.0 moles of chlorine gas at a temperature of 625 K. What is the pressure in the container? A) 15.0 MPa B) 17.3 MPa C) 13.5 MPa D) 18.2 MPa E...
*Wednesday, September 9, 2015 by Kelsey*

**Physics**

Nitrogen boils at -196°C. What is the corresponding temperature in the Fahrenheit scale? A) -290°F B) -346°F C) -315°F D) -196°F E) -321°F
*Wednesday, September 9, 2015 by Karen*

**Physics**

An ideal gas starts in state A at temperature T. The gas expands to new volume V by an adiabatic process and its final temperature is T′. What is the relationship between T and T′? A) T < T′ B) T > T′ C) T = T′ D) The answer depends on the ...
*Wednesday, September 9, 2015 by Tim*

**Physics **

On a drive from your home to town, you wish to average 52 mph. The distance from your home to town is 108 miles. However, at 54 miles (half way), you find you have averaged only 39 mph. What average speed must you maintain in the remaining distance in order to have an overall ...
*Wednesday, September 9, 2015 by Karen *

**Quick physics check**

1. During a five minute period a caterpillar crawls in a straight line along the edge of a meter stick from the 18 cm mark to the 42 cm mark. The displacement of the caterpillar during this time is A. 18 cm B. 24 cm C. 42 cm D. 60cm Is it 24 cm? 2. During a five minute period ...
*Wednesday, September 9, 2015 by Emily*

**Physics**

A ladder 10-m long and weighing 50 N rests against a smooth vertical wall. If the ladder is just on the verge of slipping when it makes a 50 degree angle with the ground, find the coefficient of static friction between the ladder and the ground.
*Wednesday, September 9, 2015 by RenRen*

**Physics**

PLEASE help! This is due tomorrow, and I really need to know how to do it. A ball of mass 0.6 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 18 m/s at angle of 58...
*Wednesday, September 9, 2015 by Anonymous *

**Physics**

PLEASE HELP! this is do tomorrow :( I have no clue how to do any of it. A plane is flying horizontally with speed 193 m/s at a height 2010 m above the ground, when a package is dropped from the plane.The acceleration of gravity is 9.8 m/s^2. 1.What is the horizontal distance ...
*Wednesday, September 9, 2015 by Lucy*

**Physics- Relativity**

A lighthouse sweeps its beam of light around in a circle once every 7.2 s. To an observer in a spaceship moving away from Earth, the beam of light completes one full circle every 9 s. What is the speed of the spaceship relative to Earth
*Wednesday, September 9, 2015 by John*

**physics**

Consider two vectors F~ 1 and F~ 2 with magnitude F1 = 61 N and F2 = 63 N and where θ1 = 98 ◦ and θ2 = 50 ◦The angles are measured from the positive x axis with the counter-clockwise angular direction as positive. What is the magnitude of the resultant ...
*Wednesday, September 9, 2015 by king*

**Physics **

A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 36.8 m/s. At the same time, it has a horizontal velocity of 52.6 m/s. At what speed does the vehicle move along its descent path? Answer in units of m/s. At what angle with the ...
*Wednesday, September 9, 2015 by Simon*

**Physics**

A plane is flying horizontally with speed 193 m/s at a height 2010 m above the ground, when a package is dropped from the plane.The acceleration of gravity is 9.8 m/s^2. 1.What is the horizontal distance from the release point to the impact point? Answer in units of m. 2.A ...
*Wednesday, September 9, 2015 by Anonymous *

**Physics**

A ball of mass 0.6 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 18 m/s at angle of 58◦ above the horizontal. The top of the fence is 10m high. The kicker&#...
*Wednesday, September 9, 2015 by Lucy*

**Physics**

An object is traveling at a constant speed of 12.0 m/s when it slows to a stop. If it takes 10.0 m for the object to stop, what is the magnitude of its acceleration?
*Wednesday, September 9, 2015 by Anonymous*

**Physics**

A box is pushed across a horizontal table by a boy applying a force of 32 N to the box. A force of friction of magnitude 19 N acts opposite the direction of motion. A stiff wind also opposes the box’s motion. What force does the box exert on the boy’s hand?
*Wednesday, September 9, 2015 by Jake*

**Physics**

A solar still is used to make fresh water from salt water by evaporation. Assume that during a summer day that 1000 BTU/ft sq of solar energy falls on the surface of the salt water. Determine how many inches of water are evaporated in 30 days. Assume that 1040 BTUs is needed ...
*Wednesday, September 9, 2015 by Steve*

**Physics**

An object initially at rest experiences an acceleration of 1.4 m/s² for 5.6 s then travels at that constant velocity for another 9.3 s. What is the magnitude of the object’s average velocity over the 14.9 s interval?
*Wednesday, September 9, 2015 by Austin *

**Physics**

A model rocket is launched from rest with an upward acceleration of 6.30 m/s2 and, due to a strong wind, a horizontal acceleration of 1.50 m/s2. How far is the rocket from the launch pad 5.30 s later when the rocket engine runs out of fuel?
*Wednesday, September 9, 2015 by Jeff*

**Physics**

An object is traveling at a constant speed of 12.0 m/s when it slows to a stop. If it takes 10.0 m for the object to stop, what is the magnitude of its acceleration?
*Wednesday, September 9, 2015 by Tyler*

**physics**

express the atmospheric pressure of 103360 pa in bar and milli bar
*Wednesday, September 9, 2015 by ajay*

**physics**

Two students are on a balcony 21.4 m above the street. One student throws a ball ver- tically downward at 15.6 m/s. At the same instant, the other student throws a ball verti- cally upward at the same speed. The second ball just misses the balcony on the way down. What is the ...
*Wednesday, September 9, 2015 by Heather*

**PHYSICS**

Calculate the centripetal force on a 2100 kg carrounding a curve of 175 m radius at a speed of 60 kph.
*Wednesday, September 9, 2015 by blabla*

**PHYSICS**

A 0.4 kg toy tied on a string can be whirled in a horizontal circle of of 1.2 m radius at a maximum of 3 rev/s before the string breaks. what is the force needed to break the string?
*Wednesday, September 9, 2015 by blabla*

**PHYSICS**

A bicycle tire is 68 cm in diameter. what frequency does it have if it travels at 8m/ sec?
*Wednesday, September 9, 2015 by blabla*

**PHYSICS**

what is the central acceleration of an automobile driving at 40 kph on a circular tracks having radius of 30m?
*Wednesday, September 9, 2015 by blabla*

**PHYSICS**

A grinding wheel with a 28cm diameter spins at a rate of 2020 revolutions per minute. What is the linear speed of the rim of the wheel?
*Wednesday, September 9, 2015 by blabla*

**Physics**

In a Thomson's e/m experiment , with an accelerating potential of 150V and a deflecting electric field of magnitude 6*10^6 N/C , the electrons travel in a straight line . i)At what fraction of the speed of light do the electrons move? ii)what magnitude of magnetic field do...
*Wednesday, September 9, 2015 by Prasanna*

**physics**

A cannon is mounted on a tower above a wide, level field. The barrel of the cannon is 20 m above the ground below. A cannonball is fired horizontally with an initial speed of 900 m/s. Assuming air resistance can be neglected, approximately how long will the cannonball be in ...
*Wednesday, September 9, 2015 by jordan*

**Physics **

The human lungs can function satisfactorily up to a limit where the pressure difference between the outside and inside of the lungs is 1/21 of an atmosphere. If a diver uses a snorkel for breathing, how far below the water can she swim? Assume the diver is in salt water whose ...
*Tuesday, September 8, 2015 by Help*

**Physics**

A point charge of 4 μC is placed at the origin. There is an external uniform field E = 400 i N/C. What is the net force on a 5 μC charge placed at (5 m, 3 m) ??? i + ??? j N
*Tuesday, September 8, 2015 by Josh*

**physics**

two forces whose resultant is 80N are perpendicular to each other,if one of them makes an angle 60degree with resultant.calculate its magnitude.
*Tuesday, September 8, 2015 by tosin*

**Physics**

An airplane flies at airspeed (relative to the air) of 470 km/h . The pilot wishes to fly due North (relative to the ground) but there is a 64 km/h wind blowing Southwest (direction 225◦). In what direction should the pilot head the plane (measured clockwise from North...
*Tuesday, September 8, 2015 by Linds*

**physics**

How long does it take the horse to cover the first 35.0 m of the race? acceleration is 3.00m/s^2
*Tuesday, September 8, 2015 by bnh*

**physics**

An amusement park carousel travels at a speed of 8.0 m/s. If the circular track of the carousel has a radius of 10.3 m, how many seconds will it take for the carousel to make one complete revolution?
*Tuesday, September 8, 2015 by Anonymous*

**physics**

A train is traveling south at 25.6 m/s when the brakes are applied. It slows down with a constant acceleration to a speed of 6.90 m/s in a time of 8.38 s. What is the acceleration of the train during the 8.38-s interval?
*Tuesday, September 8, 2015 by Anonymous*

**Physics**

A light bulb is placed 19.6 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 5.50 cm closer to the mirror. Calculate the focal length of the concave mirror.
*Tuesday, September 8, 2015 by Rachel*

**physics**

PLEASE HELP! When Babe Ruth hit a homer over the 10 m -high right-field fence 80 m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.2 m above the ground and its path initially made a 39 ∘ angle with the ground.
*Tuesday, September 8, 2015 by Al*

**Physics**

A lead ball is dropped into a lake from a diving board 4.50 m above the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 4.40 s after it is released. How deep is the ...
*Tuesday, September 8, 2015 by GraceW1*

**Physics**

A baseball traveling upward passes a window 28.0 m above the street with a vertical speed of 13.0 m/s. If the ball was thrown from street level, what is the maximum height that the baseball reaches?
*Tuesday, September 8, 2015 by GraceW1*

**Physics**

It takes a freely falling object 1.80 s to travel the last 32.00 m before it hits the ground. From how high of the ground did it fall? Assume it starts from rest.
*Tuesday, September 8, 2015 by GraceW1*

**Physics**

A piece of gum comes lose from underneath an elevator that is moving upward at a speed of 6.30 m/s. The gum reaches the bottom of the elevator shaft in 3.00 s. With what speed does the gum hit the bottom of the shaft?
*Tuesday, September 8, 2015 by GraceW1*

**Physics**

A ball is thrown directly downward with an initial speed of 7.00 m/s, from a height of 36.00 m. How long does it take the ball to strike the ground?
*Tuesday, September 8, 2015 by GraceW1*

**Physics**

A ballast bag is dropped from a balloon that is 280 m above the ground and rising at 14 m/s. What is the maximum height reached by the bag?
*Tuesday, September 8, 2015 by GraceW1*

**Physics**

You toss a quarter straight up. It takes about 2.6 seconds for it to land back on your hand at the same height you tossed it. Find the speed at which you tossed the quarter.
*Tuesday, September 8, 2015 by GraceW1*

**Physics**

A baseball is thrown straight up on the Moon with an initial speed of 28 m/s. Find the time it takes for the baseball to reach the maximum height. On the moon g = 1.6 m/s2
*Tuesday, September 8, 2015 by GraceW1*

**Physics**

A stone is thrown straight up and reaches a maximum height of 26 m. With what speed was the stone thrown?
*Tuesday, September 8, 2015 by GraceW1*

**Physics**

A rifle shoots a bullet upward from an initial height of 5m. After 3s, its height is 20m. What is the bullet's velocity at this time?
*Tuesday, September 8, 2015 by Emily*

**physics**

During takeoff, an airplane climbs with a speed of 120 m/s at an angle of 33 degrees above the horizontal. The speed and direction of the airplane constitute a vector quantity known as the velocity. The sun is shining directly overhead. How fast is the shadow of the plane ...
*Tuesday, September 8, 2015 by joe*

**Physics**

An initially motionless test car is accelerated uniformly to 135 km/h in 8.08 seconds before striking a simulated deer. The car is in contact with the faux fawn for 0.695 seconds, after which the car is measured to be traveling at 87.5 km/h. What is the magnitude of the ...
*Tuesday, September 8, 2015 by Jordan*

**Physics**

A car traveling 51.1 km/h is 29.6 m from a barrier when the driver slams on the brakes. The car hits the barrier 3.08 s later. (a) What is the car's constant deceleration magnitude before impact? (b) How fast is the car traveling at impact?
*Tuesday, September 8, 2015 by Jair*

**Physics**

A small turtle moves at a speed of 186 furlongs per fortnight. Find the speed of the turtle in centimeters per second. Note: 1 furlong = 220 yards, 1 yard = .9144 meters, and 1 fortnight = 14 days.
*Tuesday, September 8, 2015 by Chris*

**Physics**

The radius of the path of an object in uniform circular motion is halved. The centripetal acceleration needed if its speed remains the same is _____. -half as great, -the same as before, -twice as great as before, or -four times as great as before? could somebody explain the ...
*Tuesday, September 8, 2015 by Des*

**physics**

An unsuspecting bird is coasting along in an easterly direction at 4.00 mph when a strong wind from the south imparts a constant acceleration of 0.300 m/s2. If the acceleration from the wind lasts for 2.70 s, find the magnitude, r, and direction, θ, of the bird\'s ...
*Tuesday, September 8, 2015 by Jordan*

**physics**

On the Moon, the acceleration due to gravity is 1.62 m/s^2. How far would a 19 g rock fall from rest in 6.5 seconds if the only force acting on it was the gravitational force due to the Moon?
*Tuesday, September 8, 2015 by Jordan*

**Physics**

Prairie dogs are burrowing rodents. They do not suffocate in their burrows, because the effect of air speed on pressure creates sufficient air circulation. The animals maintain a difference in the shapes of two entrances to the burrow, and because of this difference, the air...
*Monday, September 7, 2015 by Help*

**Physics**

A truck with a mass of 2200 kg, moving at 31 m/s (69 mph), crashes into an immovable wall. It crumples; after the collision, the truck is 0.65m shorter in length than it was before. What is the average speed and how long did the collision last? I was confused on how to start ...
*Monday, September 7, 2015 by Krys*

**math/physics**

A pomegranate is thrown from ground level straight up into the air at time t = 0 with velocity 96 feet per second. Its height at time t seconds is f(t) = −16t2 + 96t. a) Find the time it hits the ground. t=? s b) Find the time it reaches its highest point. t=?s c) What ...
*Monday, September 7, 2015 by Natalie*

**Physics**

While John is traveling along a straight interstate highway, he notices that the mile marker reads 280. John travels until he reaches the 156-mile marker and then retraces his path to the 175-mile marker. What is John's resultant displacement from the 280-mile marker?
*Monday, September 7, 2015 by Robert*

**physics**

You throw a baseball directly upward at time t = 0 at an initial speed of 13.3 m/s. What is the maximum height the ball reaches above where it leaves your hand? At what times does the ball pass through half the maximum height? Ignore air resistance and take g = 9.80 m/s2.
*Monday, September 7, 2015 by Jordan*

**physics**

While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 7.65 m/s. The stone subsequently falls to the ground, which is 11.1 m below the point where the stone leaves your hand. At what speed does the stone impact the ground? How ...
*Monday, September 7, 2015 by Jordan*

**Physics**

A ball is dropped from rest and takes 0.43 s to fall to the floor. At what height was the ball released?
*Monday, September 7, 2015 by Anonymous*

**physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.09 m/s. The car is a distance d away. The bear is 20.9 m behind the tourist and running at 6.04 m/s. The tourist reaches the car safely. What is the maximum possible value for ...
*Monday, September 7, 2015 by Alex*

**physics 201**

A soccer ball is released from the top of a smooth incline. After 3.90 s the ball travels 10.0 m. One second later it has reached the bottom of the incline. Assume the ball's acceleration is constant and determine its value ( m/s2). How long is the incline?
*Monday, September 7, 2015 by austin*