Thursday

May 5, 2016
**PHYSICS:**

find the maximum velocity of a swingling pendulum bob.Hint potential energy(P.E)=kinetic energy(K.E)
*Tuesday, February 2, 2016 by CHIDIEBERE*

**physics**

a block of mass m is placed on a smooth turntable at a distance of 20cm from the centre.a string is tied to the block and its other end passed through a gole in the centre of the table.A 2nd block of mass m is suspended from the free end of the string as shown in fig.At what ...
*Tuesday, February 2, 2016 by Rutvik*

**Physics**

A metal ball of mass 2kg is allowed to fall freely from rest from height of 5m. Calculate potential energy it possesses and kinetic energy before it reaches the ground. What happens to mechanical energy of the ball after it hits the ground?
*Tuesday, February 2, 2016 by Angela*

**Physics **

A Boeing 747 has a mass of 400,000kg and a takeoff speed of 100m/s . It cruises at a height of 10,000m at a speed of 255m/s
*Tuesday, February 2, 2016 by Darth vader *

**physics **

1. A 50.0 Lb box is to be moved along a rough floor at a constant velocity. The coefficient of the kinetic friction is 0.300. A. What force must you exert if you push downward on the box? B. What force must you exert if you pull upward on the box? C. Which is the better way to...
*Tuesday, February 2, 2016 by Anonymous*

**physics**

A ball is thrown vertically upword with an initial velocity of 40m/s (1) calculate 1 it velocity after 3secs (2) the maximum height attend and the time taken to reach the maximum height (3) the total taken for the ball to return to the grand again
*Tuesday, February 2, 2016 by TLIMAN*

**Physics**

Work Function 1 > Work Function 2 In which case will the Kinetic energy of the emitted electrons be greater ?
*Tuesday, February 2, 2016 by Minhye*

**Physics**

why do photoelectrons emitted from a metal surface has energy distribution for an incident radiation of frequency?
*Tuesday, February 2, 2016 by Minhye*

**Science (physics)**

Before Felix enters the capsule, what can we say about his gravitational potential energy and kinetic energy?
*Monday, February 1, 2016 by elle*

**Physics**

a projectile is fired horizontally outward from the top of a table. the initial height of the bullet above the ground is 1.5 meters and the bullet travels a horizontal distance of 3.0 meters before striking the ground. Calculate the time bullet was in the air, B)muzzle(initial...
*Monday, February 1, 2016 by Rosi*

**Physics **

A Styrofoam bucket of negligible mass contains 1.75 kg of water and 0.450 kg of ice. More ice, from a refrigerator at -15.0∘C, is added to the mixture in the bucket, and when thermal equilibrium has been reached, the total mass of ice in the bucket is 0.884 kg. Assuming ...
*Monday, February 1, 2016 by Jen*

**Physics please i really need help**

Suppose a car is traveling at +23.7 m/s, and the driver sees a traffic light turn red. After 0.427 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 9.00 m/s2. What is the stopping distance of the car, as measured from the point where...
*Monday, February 1, 2016 by Erica*

**Physics**

What is the average linear speed of Mercury about the Sun? (The distance from the Sun to Mercury is 5.80 1010 meters. The orbital period around the Sun is 88 days.)
*Monday, February 1, 2016 by Melanie*

**Physics HELPPP**

(0 m/s)^2 - (23.7 m/s)^2 divided by 2(9.00 m/s)^2 ?
*Monday, February 1, 2016 by Erica*

**physics**

a bullet of mass 20g travelling at 16m/s penetrates a brock of wood and it comes to rest in 0.5seconds.find(a)the acceralation (b)the average redating force(c)the depth of the penetration
*Monday, February 1, 2016 by luckson mulanshi*

**Physics**

Why are electrons allowed to fall on a crystal plate for diffraction ?
*Monday, February 1, 2016 by Minhye*

**physics**

Falls resulting in hip fractures (or head injuries) are a major cause of injury and even death to the elderly. Typically, the hip’s speed at impact is about 2.0 meters per second. If this can be reduced to 1.3 meters per second or less, the hip will usually not fracture. ...
*Monday, February 1, 2016 by tommy*

**physics**

Falls resulting in hip fractures (or head injuries) are a major cause of injury and even death to the elderly. Typically, the hip’s speed at impact is about 2.0 meters per second. If this can be reduced to 1.3 meters per second or less, the hip will usually not fracture. ...
*Monday, February 1, 2016 by tom*

**physics**

It has been suggested, and not facetiously, that life might have originated on Mars and been carried to Earth when a meteor hit Mars and blasted pieces of rock (perhaps containing primitive life) free of the surface. Astronomers know that many Martian rocks have come to Earth ...
*Monday, February 1, 2016 by tom*

**Physics**

A jeepney slows down from 10 m/s to 4 m/s in 6 s. What is the distance covered?
*Monday, February 1, 2016 by Anonymous*

**physics**

Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.'
*Monday, February 1, 2016 by ang*

**physics**

Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.
*Monday, February 1, 2016 by ang*

**Physics**

A 112 g hockey puck glides across a frictionless ice surface with no horizontal forces acting on it. If the puck's velocity is 22.5 m/s to the right at t = 0 s, what will the puck's horizontal velocity be at t = 225 ms? Round your answer to the nearest 0.1 m/s.
*Monday, February 1, 2016 by Anonymous*

**Physics HELP!!**

From the top of a cliff overlooking a lake, a person throws two stones, as shown in the drawing. The cliff is 39.2 m high. The two stones described have identical initial speeds of v0 = 19.2 m/s and are thrown at an angle θ = 29.2 °, one below the horizontal and one ...
*Monday, February 1, 2016 by James Houl*

**Physics**

The initial velocity and acceleration of four moving objects at a given instant in time are given in the following table. Determine the final speed of each of the objects, assuming that the time elapsed since t = 0 s is 2.0 s. Initial Velocity (a) +12 m/s (b) +12 m/s (c) -13 m...
*Monday, February 1, 2016 by Erica*

**Physics**

From the top of a cliff overlooking a lake, a person throws two stones, as shown in the drawing. The cliff is 39.2 m high. The two stones described have identical initial speeds of v0 = 19.2 m/s and are thrown at an angle θ = 29.2 °, one below the horizontal and one ...
*Monday, February 1, 2016 by James Houl*

**Physics**

A freight train has two engines, each with a mass of 50,000kg, pulling 15 freight cars, each having a mass of 40,000kg.The
*Monday, February 1, 2016 by Pious*

**physics**

a uniform beam 6.0 metre long and weighing 4kg rests on support at p and q placed left and right 1.0 metres from each end of the beam weights of mass 10 kg and 8kg are placed near p and q respectively one each end of the beam.calculate the reaction at p and q?
*Monday, February 1, 2016 by mary*

**Physics**

A jet aircraft rolls onto the end of a runway before accelerating down the runway for takeoff. At the point where the aircraft leaves the ground, it is traveling at 100 m/s. If the aircraft's initial speed when it rolled onto the runway was 10 m/s, and it accelerates for ...
*Sunday, January 31, 2016 by Matt*

**Physics**

If the maximum current in an LR circuit is 2 A what is the instantaneous current at t= time constant of the circuit?
*Sunday, January 31, 2016 by Minhye*

**physics**

A particle moving in simple harmonic motion passes through the equilibrium point x=0, 3 times per second. At t=0 its velocity at x=−0.0325m is negative. It travels 0.5m in a complete cycle. a) what is the phase constant in cm. i found the equation: x(t)=12.5sin(3pi t +x...
*Sunday, January 31, 2016 by maryam*

**Physics**

A 300g particle oscillating in SHM travels 11cm between the two extreme points in its motion with an average speed of 65 cm/s. a) Find the angular frequency b)The maximum force on the particle c)The maximum speed
*Sunday, January 31, 2016 by sarah*

**Physics**

An air-filled parallel plate capacitor has a capacitance of 37 pF. (a) What is the separation of the plates if each plate has an area of 0.8 m2? (cm) (b) If the region between the plates is filled with a material with κ = 5.0, what is the final capacitance? (pF)
*Sunday, January 31, 2016 by Anonymous*

**Physics**

(a) What is the electric potential V at a distance r = 3.1 10-8 cm from a proton? (V) (b) What is the electric potential energy in units J and eV of an electron at the given distance from the proton? (J) (eV)
*Sunday, January 31, 2016 by Anonymous*

**Physics**

We study the three point charges. They are held at the corners of an equilateral triangle with ℓ = 0.7 m. What is the electric potential energy of the system of three point charges? Use for the three charges q1 = +2Q, q2 = −3Q, q3 = +Q, where Q = 120 nC
*Sunday, January 31, 2016 by Anonymous*

**Physics**

Consider a circular track with a radius of 200 meters. A runner starts on the east side and runs around the track to a point diametrically opposite her starting point. -What is the magnitude of her displacement? 400m -She then runs the rest of the way around the track to ...
*Sunday, January 31, 2016 by Terry*

**physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.55 m/s. The car is a distance d away. The bear is 17.1 m behind the tourist and running at 4.84 m/s. The tourist reaches the car safely. What is the maximum possible value for d?
*Sunday, January 31, 2016 by Kim*

**physics**

A blue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.2 m/s2. A green car arrives at the position of the stop-light 7.5 s after the light had turned green. What is the slowest constant speed which the green car can ...
*Sunday, January 31, 2016 by hannah *

**Physics**

A cannonball is fired with initial speed v0 at an angle 30° above the horizontal from a height of 42.9 m above the ground. The projectile strikes the ground with a speed of 1.2v0. Find v0.
*Sunday, January 31, 2016 by Nicole*

**Physics**

An arrow is shot from a height of 1.5 m toward a cliff of height . It is shot with a velocity of 30 m/s at an angle of 60 deg above the horizontal. It lands on the top edge of the cliff 4.0 s later. (a) What is the height of the cliff? (b) What is the maximum height reached by...
*Sunday, January 31, 2016 by Jeff*

**physics**

A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 205 mi/h in 2.70 s. (a) Find the average acceleration of the plane. (answer in m/s^2) (b) Assuming the acceleration is constant, find the distance the plane moves. answer ...
*Sunday, January 31, 2016 by joanna*

**physics**

A ball is thrown directly downward with an initial speed of 8.95 m/s, from a height of 29.0 m. After what time interval does it strike the ground? answer in (in seconds)
*Sunday, January 31, 2016 by joanna*

**physics**

A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How high does it rise? (in meters) (b) How long does it take to reach its highest point? (in seconds)
*Sunday, January 31, 2016 by joanna*

**physics Help please!**

h(m) KE (J) PEgravity (J) PEelastic (J) E 0 ______ _________ _________ __ 0.2 ______ _________ __________ ___ 0.4 ______ _________ __________ __ A 2.40-kg object is hanging from the end of a vertical spring. The spring constant is 31.0 N/m. The object is pulled 0.200 m ...
*Sunday, January 31, 2016 by mike*

**Physics**

What is the likely identity of a substance (see Table 10-1) if a sample has a mass of 9.38 g when measured in air and an apparent mass of 8.55 g when submerged in water? A)Copper B)Iron or steel C)Aluminum D) Lead E)Concrete F)Gold
*Sunday, January 31, 2016 by Larisa*

**Physics**

Suppose a soccer player kicks the ball from a distance 30 m toward the goal. Find the initial speed of the ball if it just passes over the goal, 2.4 m above the ground, given the initial direction to be above the horizontal.
*Sunday, January 31, 2016 by Drew*

**physics**

Two force of 5n and 12n respectively act on the same point.show how you would determine the magnitude of the resultant by using the tail- to head and tail to tail methods and Pythagoras theorem (13n)
*Sunday, January 31, 2016 by Bontle Letsoalo*

**Physics**

A speaker has a diameter of 0.303 m. (a) Assuming that the speed of sound is 343 m/s, find the diffraction angle è for a 1.80-kHz tone. (b) What speaker diameter D should be used to generate a 3.72-kHz tone whose diffraction angle is as wide as that for the 1.80-kHz ...
*Sunday, January 31, 2016 by Japhet*

**Physics**

I'm preparing for a test. Can anyone check my answer for all these questions? These are my questions: 1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] ...
*Sunday, January 31, 2016 by Matt Damon*

**physics**

what is tripple point?
*Sunday, January 31, 2016 by promise*

**physics**

Imagine a parallel universe in which the electric force has the same properties as in our universe but there is no gravity. In this parallel universe, the sun carries charge Q, the earth carries charge −Q, and the electric attraction between them keeps the earth in orbit...
*Sunday, January 31, 2016 by jack*

**physics**

An electron is projected with an initial speed of (1.90x10^6 m/s) into the uniform field between two parallel plates. Assume that the field between the plates is uniform and directed vertically downward, and that the field outside the plates is zero. The electron enters the ...
*Sunday, January 31, 2016 by jack*

**Physïcs**

A body is displaced through a certain distance x by a force of 30 newtons.if the work done is 100 joules and the displacement is in the direction of force,what is the value of x?
*Sunday, January 31, 2016 by CHIDIEBERE*

**PHYSICS:**

A boy weighing 350N runs up a flight of stairs consisting of 20 steps each 10 cm high in 10 seconds.what is his power?
*Sunday, January 31, 2016 by CHIDI*

**physics**

A ball is thrown directly downward with an initial speed of 8.95 m/s, from a height of 29.0 m. After what time interval does it strike the ground?
*Sunday, January 31, 2016 by joanna*

**physics**

A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the ...
*Sunday, January 31, 2016 by jojo*

**physics**

A jet plane lands with a speed of 81 m/s and can accelerate at a maximum rate of −5.00 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest? (b) Can this plane land on a small tropical ...
*Sunday, January 31, 2016 by jojo*

**physics**

A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 205 mi/h in 2.70 s. (a) Find the average acceleration of the plane. (b) Assuming the acceleration is constant, find the distance the plane moves.
*Sunday, January 31, 2016 by jojo*

**Physics**

A 9.7 kg block moving at 3 m/s makes a head-on elastic collision with a stationary block of mass 7.6 kg. Find the velocity of the 7.6 kg block. Answer in units of m/s.
*Sunday, January 31, 2016 by Briana*

**Physics**

A 1000-kg aircraft going 25 m/s collides with a 1500-kg aircraft that is parked. They stick together after the collision and are moving at 10 m/s. If they skid for 30 seconds before stopping, how far (in meters) did they skid? Hint: Are the aircraft moving at a constant ...
*Saturday, January 30, 2016 by Bill*

**physics**

Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a) magnitude and (b) direction for the resultant that occurs ...
*Saturday, January 30, 2016 by Lydia*

**physics**

Can anyone help just can figure it out. Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a) magnitude and (b) ...
*Saturday, January 30, 2016 by Lydia*

**physics**

Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a) magnitude and (b) direction for the resultant that occurs ...
*Saturday, January 30, 2016 by Lydia*

**Physics**

Find the center of mass of two objects, one of mass M and one of mass m, separated by distance L? At R1 = L * (1 - m/(m+M)) from m and R2 = m * L/(m+M) from M At R1 = L^2 x (1 - m/(m+M)) from m and R2 = m * L^2/(m+M) from M At R1 = m * L/(m+M) from m and R2 = L * (1 - m/(m+M...
*Saturday, January 30, 2016 by Shantal*

**PHYSICS**

At what height above the ground must a body of mass 10kg be situated inorder to have potential energy equal in value to the kinetic energy possessed by another body of mass 10kg moving with a velocity of 10m/s?
*Saturday, January 30, 2016 by Anonymous*

**Physics**

I'm preparing for a test. Can anyone check my answer for all these questions? These are my questions: 1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] ...
*Saturday, January 30, 2016 by KevJumba*

**PHYSICS**

Can an act of fissure destroy a blackhole
*Saturday, January 30, 2016 by TRYSYENS*

**Physics 201**

A diver springs upward from a board that is 2.90 meters above the water. At the instant she contacts the water her speed is 9.11 m/s and her body makes an angle of 78.2° with respect to the horizontal surface of the water. Determine her initial velocity.
*Saturday, January 30, 2016 by Kenisha Frinks*

**Physics**

Find energy of an X-ray photon which can impart maximum energy of 50 keV to electron?
*Saturday, January 30, 2016 by Sachin *

**Physics**

find the angle of banking of curved railway track of radius 600m if the maximum saftey sppedd limit is 54;km/hr .if distance beetween the rails is 1.6m find elevation ofvthe outervtrack above the inner track
*Friday, January 29, 2016 by Rahul*

**Physics**

Charge A, +1 μC, is positioned at the origin of a coordinate system as shown below. Charge B, −1 μC, is fixed at x = 3 m. (a) Determine the magnitude and direction of the force that charge B exerts on charge A. (b) What is the force that charge A exerts on ...
*Friday, January 29, 2016 by Alyssa*

**Physics**

Charge A, +1 μC, is positioned at the origin of a coordinate system as shown below. Charge B, −1 μC, is fixed at x = 3 m. (a) Find the electric field on the x axis at x = 6 cm. (b) At what point on the x axis is the electric field zero?
*Friday, January 29, 2016 by Alyssa*

**Physics**

(a) Estimate the positive charge in you due to the protons in the molecules present in your body. (Assume that the human body is made entirely out of water.) (b) What is the net charge in your body?
*Friday, January 29, 2016 by Alyssa*

**physics**

A ball is thrown off a balcony (40 m high) and has an initial velocity of 18 m/s horizontally. (a) Determine the position of the ball at t = 4.0 s. (b) Determine the position after 4.0s?
*Friday, January 29, 2016 by anonymous*

**physics**

An object is moved left to right horizontally 2 meters while a force of 3 Newtons to the left acts. No other forces act on the object. Draw a diagram of showing the displacement and the force and calculate the work done on the object in Joules.
*Friday, January 29, 2016 by callie*

**physics projectile**

a body is projected horizontally with a velocity of 80m/s from the top of a tower 160m above the ground. find the time of flight,range,velocity at which the body strikes the ground
*Friday, January 29, 2016 by wisdom*

**Physics**

On earth, two parts of a space probe weigh 14500 N and 6400 N. These parts are separated by a center-to-center distance of 19 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far ...
*Friday, January 29, 2016 by Melanie*

**Physics**

A truck starts from rest and accelerates at 2.0 m/s² for 4.0 s. How far will it have gone at the end of this time?
*Friday, January 29, 2016 by Anonymous*

**PHYSICS**

explain how exotic matter stabilizes a wormhole,google's answer was not direct
*Friday, January 29, 2016 by STEVIUM*

**Physics**

A metal sphere is launched with an initial velocity of 1.5 m/s as it leaves the ramp. The end of the ramp is 1.20 m above the floor. Calculate the range of the sphere.
(Range is the horizontal displacement of the projectile.)
*Friday, January 29, 2016 by Jake Lammers*

**physics **

find a unit vector parallel to the resultant of vectors : A=2i^+j^-k^& B=3i^-2j^+2k^
*Friday, January 29, 2016 by gurleen*

**physics**

a metal ball falls from a. height 1m onto a. steel. plate and jump. up. to a. height of. 0.81m. .find. the. coefficient of restitution
*Friday, January 29, 2016 by Anonymous*

**sciense(physics)**

a car of mass 100kg travering at 36km/h is brought to rest over a distance of 40m.calculate(a)accelaration(b)the average abreaking force
*Thursday, January 28, 2016 by luckson*

**Physics**

Tarzan (80 kg) runs toward a vine at 4.8 m/s where Jane (60 kg) is hanging on. He jumps and grabs the vine. How high does the vine swing? If the vine is 25 m long, how much of an angle does that make?
*Thursday, January 28, 2016 by Alyssa*

**Physics**

A boy on a swing reaches a maximum height of 3.2 m and a minimum height of .55 m. What is the speed of the boy at the lowest point if the boy has a mass of 34 kg? v(final)=?
*Thursday, January 28, 2016 by Tori *

**physics**

A 10 kg mass moving at 6 m/s strikes a stationary 2 kg mass in an elastic collision. Determine the velocity of each after the collision. 10(6)+2(0)=(10)Vf1+(2)Vf2 60=(10)Vf1+(2)Vf2
*Thursday, January 28, 2016 by alyssa*

**Physics**

In the figure we see two blocks connected by a string and tied to a wall, with θ = 27°. The mass of the lower block is m = 1.2 kg; the mass of the upper block is 2.0 kg.
*Thursday, January 28, 2016 by Oreos*

**Physics **

A projectile is shot on level ground with a horizontal velocity of 21 m/s and a vertical velocity of 45 m/s. Part 1) Find the time the projectile is in the air. The acceleration due to gravity is 9.8 m/s^2 .Answer in units of s. Part 2) Find the range R. Answer in units of m. ...
*Thursday, January 28, 2016 by John Abrham*

**Physics help **

Did i do number 2 and 3 correct? 2. A billiard ball (0.62 kg) with a velocity of 2.0 m/s [N] hits another ball and has a velocity of 1.7 m/s [E] after the collision. Determine the impulse on the ball and the average force exerted on it during the collision if the duration of ...
*Thursday, January 28, 2016 by I NEED DAMON'S HELP*

**Physics**

In the figure we see two blocks connected by a string and tied to a wall, with θ = 27°. The mass of the lower block is m = 1.2 kg; the mass of the upper block is 2.0 kg.
*Thursday, January 28, 2016 by Oreos*

**Physics help **

I'm preparing for a test. Can anyone check my answer for all these questions? These are my questions: 1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] ...
*Thursday, January 28, 2016 by I NEED DAMON'S HELP*

**Physics help **

Are you sure that's how you do #4 because they have 2 different directions. I need physics help. I don't understand how to do these questions. Can someone show me what I should use? and explain. I'll do calculations by myself. A stationary curling stone is struck ...
*Thursday, January 28, 2016 by HENRY - I NEED YOUR HELP?*

**Physics help **

A car with a mass of 1800 kg is initially travelling with a velocity of 22 m/s [N] when it collides with a truck with a mass of 3200 kg traveling with a velocity of 14 m/s [E]. If the two vehicles become attached during the collision, determine their final velocity.
*Thursday, January 28, 2016 by JACKIE CHAN*

**Physics - Am I correct? **

I'm preparing for a test. Can anyone check my answer for all these questions? These are my questions: 1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] ...
*Thursday, January 28, 2016 by JOHN CENA*

**maths/physics**

4. Write down a diﬀerential equation to express each of the following relationships: (a) The rate at which the volume of a sphere changes with radius is proportional to the square of the radius. (b) Gravitational attraction F between two given bodies of masses m1 and m2...
*Thursday, January 28, 2016 by Sarah*

**Physics (**

3. Terminal velocity of an object in freefall is given by Vt = root 2gMA/Cdñ , where g is gravitational acceleration,Cd is the coefficient of drag, p is air density, and MA is the ratio M/A of mass M to ‘downwards facing’ area A. For a falling sphere of radius...
*Thursday, January 28, 2016 by Sarah*

**Physics (Gravitation)**

2. To leave the gravitational ﬁeld of a planet, a space rocket must be launched at an escape velocity of: ve =r2GM r , where G is the gravitational constant G ¡Ö 6.8¡Á10−11Nm2/kg2, M is the mass of the planet and r is its radius. Suppose ...
*Thursday, January 28, 2016 by Sarah*

**Physics**

A man uses a lever jack to lift a 2.00 × 10^3 kg car to change a tire. Each stroke of the jack lifts the car a distance of 5.00 × 10^(-3) m. The vertical displacement of the handle is 0.75 m for each stroke. How much total force does he use with each stroke of the ...
*Thursday, January 28, 2016 by Grace*

**physics**

How much positive charge is in 0.8 kg of neon? The atomic weight (20.1797 g) of neon contains Avogadro’s number of atoms, with each atom having 10 protons and 10 electrons. The elemental charge is 1.602 × 10−19 C and Avogadro’s number is 6.023 × ...
*Thursday, January 28, 2016 by sami*

**physics**

can anyone help me in this question please A particle of mass 27 g and charge 32 µC is released from rest when it is 79 cm from a second particle of charge −22 µC. Determine the magnitude of the initial acceleration of the 27 g particle. Answer in units of m/...
*Thursday, January 28, 2016 by alin*