Sunday

October 4, 2015
**physics**

A woman measures the angle of elevation from her current location to a mountaintop to be 12.0°. After walking 1.10 km closer to the mountain on level ground, she measures the angle again and finds it to be 14.0°. What is the height of the mountain?
*Monday, January 12, 2015 by Brittani*

**physics**

The acceleration of a particle which moves along the x axis is given by a=4x+5x^(3/2) The particle has speed of 2m/s when x=1m x is in meters a is in m/s^2 evaluate the velocity when x = 8m I know that I need to use kinematic eqn 3 adr = vdv then take the integral but I'm ...
*Monday, January 12, 2015 by Anonymous*

**physics**

A student in the laboratory connects a 13 Ω resistor, a 24 Ω resistor, and a 41 Ω resistor in parallel and then connects the arrangement to a 43 V dc source. What is the current? What is the power? (in watts)
*Monday, January 12, 2015 by Lo*

**AP Physics**

A dart gun vertically launches a 25g dart 50 cm high. Determine the minimum energy stored in the spring when the dart gun was loaded. What would the qualitative bar graph and energy flow diagrams look like?
*Monday, January 12, 2015 by AnnWarren*

**AP Physics**

A ball has an initial velocity of 3 m/s. If there is no friction, what is the highest it could roll? What would the qualitative bar graphs and energy flow diagram look like?
*Monday, January 12, 2015 by AnnWarren*

**Physics-Check**

In a marathon race, one runner is moving at 5.0 m/s passes a second runner moving at 4.5. What is the distance between the runners 10 minutes after the one runner has passed the other? 5m?
*Monday, January 12, 2015 by Lucina*

**Physics**

Determine the magnitude of the gravitational force Mars would exert on man if he was on the surface of Mars. The mass of the man is 69.0kg . The mass of the Mars is 6.42×1023kg and its radius is 3396 km.
*Monday, January 12, 2015 by Katie*

**physics**

how much heat is needed to raise the temperature of 5kg of silver from 20 degrees C to 96 decgrees C?
*Monday, January 12, 2015 by patrick*

**physics**

1. While strolling along on unknown planet, an astronaut decides to throw a hammer and a feather upwards at 5.0 m/s. They both return to the point of release in 3.0 s. What is the acceleration due to gravity on Planet X. 2. Marii jumps straight upward at 15.0 m/s. How high is ...
*Monday, January 12, 2015 by chen*

**physics**

an airplane is flying at 300 m/s(672 mi/h).How much time must elapse before a clock in the airplane and one on the ground differ by 1.00 s?
*Monday, January 12, 2015 by habtamu.amogne*

**physics**

The linear impulse delivered by the hit of a boxer is 222 N · s during the 0.187 s of contact. What is the magnitude of the average force exerted on the glove by the other boxer? Answer in units of N.
*Sunday, January 11, 2015 by Jackie*

**physics**

A golf ball (m = 35.4 g) is struck a blow that makes an angle of 61.8 ◦ with the horizontal. The drive lands 176 m away on a flat fairway. The acceleration of gravity is 9.8 m/s 2 . If the golf club and ball are in contact for 3.01 ms, what is the average force of impact...
*Sunday, January 11, 2015 by Alex*

**Physics **

The linear impulse delivered by the hit of a boxer is 97.7 N·s during the 0.368 s of contact. What is the magnitude of the average force exerted on the glove by the other boxer? Answer in units of N.
*Sunday, January 11, 2015 by Kim *

**Physics**

Why do citizens have a responsibility to have some basic understanding of nature's rules?
*Sunday, January 11, 2015 by Victoria*

**Physics**

How would Ion Propulsion affect the cpst of spaceflight? Or How much does ion thrusters/ ion propulsion cost? I have been googling this for an hour and have yet discovered a answer. Help ??
*Sunday, January 11, 2015 by Amber*

**physics**

A 32 kg gun is standing on a frictionless surface. The gun fires a 55.1 g bullet with a muzzle velocity of 320 m/s. The positive direction is that of the bullet. Calculate the momentum of the bullet immediately after the gun was fired. Answer in units of kg · m/s.
*Sunday, January 11, 2015 by Jackie*

**physics**

A runner travelling at a velocity of 2.5 m/s[S] accelerates at a constant rate to pass another runner to win the race. She accelerates at a steady 1.5 m/s2 for 4.0 s and wins the race. (a) How fast was she running at the end of the race?
*Sunday, January 11, 2015 by kl*

**Physics**

An object moves in a circular path at 861 rpm. If the radius of its circular path is 9.27 meters, calculate a) the distance traveled in one complete revolution d = m b) the time it takes for one complete revolution T = seconds c) the linear speed of the object as it moves in a...
*Sunday, January 11, 2015 by JOHNNY*

**Conceptual Physics**

Why do citizens have a responsibility to have some basic understanding of nature's rules?
*Sunday, January 11, 2015 by Victoria*

**physics**

The coefficient of static friction between a skier and the snow is 0.16, with a coefficient of kinetic friction of 0.13. The skier weighs 550N. How much force directed parallel to the horizontal surface is required for the skier to start to move? Known, Us= 0.16 Uk=0.13 Wt=...
*Sunday, January 11, 2015 by Peta*

**physics**

The hypotenuse of a right triangle is 35 cm long, and the length of the short sides is 23 cm. Find the length of the other side.
*Sunday, January 11, 2015 by Rona*

**physics**

A racing car has a mass of 1970 kg. The acceleration of gravity is 9.8 m/s^2. What is its kinetic energy if it has a speed of 102 km/h? Answer in units of J.
*Sunday, January 11, 2015 by anna*

**physics**

Shawn and his bike have a total mass of 51.1 kg. Shawn rides his bike 1.7 km in 10.7 min at a constant velocity. The acceleration of gravity is 9.8 m/s squared. What is Shawn’s kinetic energy? Answer in units of J.
*Sunday, January 11, 2015 by sarah*

**Physics**

A bath toy is floating stationary in water such that half of the toy is above water and half of the toy is below the water. A kid pulls the toy 3.9 cm down into the water and then lets go. The toy then proceeds to bob up and down. It bobs up and down 26 times in a minute. NOTE...
*Saturday, January 10, 2015 by Anonymous*

**physics**

A bath toy is floating stationary in water such that half of the toy is above water and half of the toy is below the water. A kid pulls the toy 3.9 cm down into the water and then lets go. The toy then proceeds to bob up and down. It bobs up and down 26 times in a min.
*Saturday, January 10, 2015 by DS*

**Physics and Maths**

A sphere of uniform density d1 has a radius R. It also consists of a hollow sphere of radius r. the sphere floats slightly on water of density d2. Find r.
*Saturday, January 10, 2015 by Anonymous*

**physics**

'Melvin lifts a 28.9 kg bucket from a well and does 3.41 kJ of work. how deep is te well'
*Saturday, January 10, 2015 by mari*

**physics**

A playground merry-go-round has a radius 2.6 m and a rotational inertia 83 kg.m^2. When the merry-go-round is at rest, a child with mass 27 runs with speed 4.3 along a line tangent to the rim and jumps on. The angular velocity of the merry-go-round is then:
*Saturday, January 10, 2015 by marya*

**physics**

A quantity of steam (750 g) at 122°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?
*Friday, January 9, 2015 by lo*

**Physics**

A golf club strikes a 0.040-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball's motion, has a magnitude of 7050 N, and is in contact with the ball for a distance of 0.014 m. With...
*Friday, January 9, 2015 by B.Mac*

**Aristotle **

I know Aristotle studied a lot of things but was he a physicist as well? I feel like he wasn't really one quite yet because it wasn't really officially developed yet. But I know he was very into the math of astronomy and that's basically the first beginnings of ...
*Friday, January 9, 2015 by Manie*

**physics**

A 10-g pin ball rolls over a track like the one shown above. If the second hill forms a curvature with a radius of 1.5 m, what is the maximum velocity that the pin ball can roll with over the top of the second hill without flying off? G) 10g=mass 1.5m=radius U) VF=? E)
*Friday, January 9, 2015 by Donny G*

**physics**

a horse pull a barge with a force at an angle of 30¡ã to the horizontal for a distance of 20km . find the work done.
*Friday, January 9, 2015 by elder*

**physics**

weight of a person in newton on mars who weigh 882N on earth ( g = 9.8m/s^2). weight of person on earth who weighs 333N on mars.
*Friday, January 9, 2015 by Anonymous*

**physics**

weight of a person in newton on mars who weigh 882N on earth ( g = 9.8m/s^2)
*Friday, January 9, 2015 by Anonymous*

**Physics**

Concerning Newton's Cradle: a) Determine the velocity of ball 2 just after the collision in terms of vi. Also I am having problems with the following question: A boy moves on a skateboard at a constant velocity of 3 m/s. The combined mass of the boy and the skateboard is ...
*Friday, January 9, 2015 by Shanita*

**Physics**

Right now in physics we are learning about electric potential energy and electric potential. My question is: P and Q are points within a uniform electric field that are separated by a distance of 0.1 m. The potential difference between P and Q is 50 V. How much work is ...
*Friday, January 9, 2015 by Jeff*

**Physics**

A 1500 kg car traveling at 100 km/h west collides with a 1200 kg car traveling east at 85 km/h. The heavier car slows to 25 km/h after the collision. How fast is the lighter car traveling after the two cars collide?
*Thursday, January 8, 2015 by Monica*

**Physics**

Amy walks at an average speed of 1.75 m/s toward her airport gate. When she comes within 57.5 m of her gate, she gets onto and continues to walk on a people mover at the same rate. (A) If she arrives at the gate 15.3 seconds after getting on the people mover how fast was the ...
*Thursday, January 8, 2015 by Anita*

**physics**

A daredevil decides to jump a canyon of width 12 m. To do so, he drives a motorcycle up an incline sloped at an angle of 14.2◦. The acceleration of gravity is 9.8 m/s2 . What minimum speed must he have in order to clear the canyon? Answer in units of m/s.
*Thursday, January 8, 2015 by rebecca*

**physics**

A vertically hanging bungee cord has a length of 6 m and k = 50N/m. What is the new length of the bungee if a student of mass 40 kg is suspended from the lower end?
*Thursday, January 8, 2015 by Anonymous*

**Physics**

A 22 g ball is fastened to one end of a string 86 cm long and the other end is held fixed at point O so that the string makes an angle of 35 ◦ with the vertical, as in the figure. This angle remains constant as the ball rotates in a horizontal circle. The angle θ ...
*Thursday, January 8, 2015 by Lita*

**physics**

When we say that an object wants to maintain its state of motion, we’re talking about inertia. Which term determines the quantity of inertia for an object?
*Thursday, January 8, 2015 by Jay*

**Physics help - Earths force**

Is the force of the earth’s gravity on the sun stronger, weaker, or the same as the force of the sun’s gravity on the earth? Explain why the sun’s attraction affects the motion of the earth more than the earth’s attraction affects the sun’s motion. So ...
*Thursday, January 8, 2015 by Emily*

**physics**

A block of mass m slides down a frictionless incline as The block is released from height h above the bottom of the circular loop. (a) Find the force exerted on the block by the inclined track at point A. (Hint: Consider the Newton’s 2nd law in the radial direction and ...
*Thursday, January 8, 2015 by ahmed*

**physics**

A spaceship moving with an initial velocity of 58.0 meters/second experiences a uniform acceleration and attains a final velocity of 153 meters/second. What distance has the spaceship covered after 12.0 seconds?
*Thursday, January 8, 2015 by luisa*

**Physics and Math**

[a bullet weighing 50gm hits a 10cm wall with velocity 100ms-1 and comes out of the wall. If the frictional force on the bullet while in the wall is assumed to be a constant 2000N then with what velocity does the bullet come out of the wall?
*Thursday, January 8, 2015 by Anna*

**physics**

A heavy table of mass M is vibrationally isolated by being hung from the ceiling by springs, so that its frequency of vertical oscillation is \omega_0 (take \omega_0 to be 2\pi/sec, a typical value). Assume now that the ceiling vibrates vertically with amplitude A at frequency...
*Thursday, January 8, 2015 by david*

**physics**

An MRT Train accelerates at a rate of 2.75 m/s^2 from rest for 3.00 seconds.How fast will the train be moving after that time?
*Thursday, January 8, 2015 by Anonymous*

**Physics and Math**

[a bullet weighing 50gm hits a 10cm wall with velocity 100ms-1 and comes out of the wall. If the frictional force on the bullet while in the wall is assumed to be a constant 2000N then with what velocity does the bullet come out of the wall?
*Thursday, January 8, 2015 by Serah!*

**Physics and Math**

A small ball with a mass of 1 kg rolls down a long frictionless inclined ramp, which is at an angle 3o Degree above the horizon. A linear spring, whose length is not negligible, is attached to the bottom of the ramp. The ball is released from a distance of 1 m above the spring...
*Thursday, January 8, 2015 by Anonymous*

**science**

home / homework help / questions and answers / science / physics / the temperature of an ideal gas at an initial pressure ... Question The temperature of an ideal gas at an initial pressure P1 and volume V1 is increased at constant volume until the pressure is doubled. The ...
*Thursday, January 8, 2015 by ahmad*

**physics **

A person at the roof of a high building has projected a ball at velocity 50m/s given that the acceleration due to gravity = 10 the displacement and velocity when : The ball has been protected upwards with angle 30 to the horizontal. And when the ball been projected ...
*Thursday, January 8, 2015 by Youssef ismail*

**physics**

An Olympic pool has dimensions 50.0 m × 25.0 m × 2.68 m (length × width × depth). The density of the pool water is 1007 kgm-3. Atmospheric pressure (1.00 atm) is acting on the surface of the water. If a child dives down to the bottom of the pool what ...
*Thursday, January 8, 2015 by sam*

**physics **

A proposed space station consists of a circular tube that will rotate about its center(like a tubular bicycle tire). The circle formed by the tube has a diameter of 1.1km. What must be the rotation speed(revolutions per day) in an effect nearly equal to gravity at the surface ...
*Wednesday, January 7, 2015 by Alexis*

**physics**

A baseball has a mass of about 0.15 kg, and it is pitched towards home plate at a speed of about 60 m/s. If the bat exerts an average force of 8600 N for 2.4 ms, what is the final speed of the ball in m/s?
*Wednesday, January 7, 2015 by han *

**PHYSICS! **

A 3.0 g coin moving to the right at 27.0 cm/s makes an elastic head-on collision with a 20.0 g coin that is initially at rest. After the collision, the 3.0 g coin moves to the left at 12.5 cm/s. (b) Find the amount of kinetic energy transferred to the 20.0 g coin. I found part...
*Wednesday, January 7, 2015 by Sara*

**physics**

1. A billiard ball of mass mA = 0.4 kg moving with a speed vA = 2 m/s strikes a second ball, initially at rest, of mass mB = 0.4 kg. As a result of the collision, the first ball is deflected off at an angle of 30.0o with a speed v’A = 1.2 m/s. Taking the xaxis to be ...
*Wednesday, January 7, 2015 by Jesse*

**Physics**

A 0.500 kg bead slides on a straight frictionless wire with a velocity of 1.50 cm/s to the right. The bead collides elastically with a larger 0.750 kg bead initially at rest. After the collision, the smaller bead moves to the left with a velocity of 0.70 cm/s. Find the ...
*Wednesday, January 7, 2015 by Wendell*

**Physics **

"A moving object has a kinetic energy of 145 J and a momentum with a magnitude of 40.0 kg·m/s. Determine the mass and speed of the object." I simply cannot figure it out. I know that KE=.5mv^2 and that p=mv but I can't seem to piece it together. Please ...
*Wednesday, January 7, 2015 by Jane*

**Physics**

A car travels around a curve banked at 45 degrees at 30 m/s. The radius of the track is 40m. What is the resultant force on the driver of the car?
*Wednesday, January 7, 2015 by Jody*

**physics**

A dart player throws a dart horizontally at a speed of 13.5 m/s. The dart hits the board 0.32 m below the height from which it was thrown. How far away is the player from the board?
*Wednesday, January 7, 2015 by Jade*

**physics**

A riﬂe ﬁres a(n) 5 g bullet with a muzzle velocity of 360 m/s into a block of wood. The bullet comes to rest after it has made a(n)19 cm deep hole in the wood.A riﬂe ﬁres a(n) 5 g bullet with a muzzle velocity of 360 m/s into a block of wood. The ...
*Wednesday, January 7, 2015 by Anonymous*

**Physics**

A box is pulled along a level floor at a constant speed by a rope that makes a 45 degree angle with the floor. The box weighs 100N. The coefficient of sliding friction is 0.75. The normal force exerted on the box by the floor is?
*Wednesday, January 7, 2015 by Ava*

**physics**

A child is pulling a sled across a horizontal surface by a rope that makes a 27.5 degree angle with the ground. The child pulls with a force of 32.7 N and the total mass of the sled is 23.5 kg. Find the weight of the sled.
*Wednesday, January 7, 2015 by Michael*

**physics**

Two 4.6 g bullets are fired with speeds of 36.9 m/s and 74.8 m/s, respectively. a) What is the kinetic energy of the first bullet? Answer in units of J. b) What is the kinetic energy of the second bullet? Answer in units of J. I got part A), which is 3.131703J but i cant get ...
*Wednesday, January 7, 2015 by allan*

**Physics**

The coefficient of friction sliding on wood is 0.30. The force needed to slide a wooden block weighing 500N across a horizontal surface is: a. 50N b. 150N c. 300N d. 500N
*Wednesday, January 7, 2015 by Buck*

**Physics**

Suppose the position of an object at time t is (6 + 5t, 2t2, 7t − 5t3). (a) What is the instantaneous velocity at time t? (b) What is the acceleration at time t? (c) What is the instantaneous velocity at time t = 0? (d) What is the acceleration at time t = 0? I know that...
*Wednesday, January 7, 2015 by Sarah *

**physics **

A racing car travels on a circular track of radius 399 m, moving with a constant linear speed of 40.5 m/s. Find its angular speed. Answer in units of rad/s
*Wednesday, January 7, 2015 by Amanda Om *

**Physics**

A block of mass 4 kg slides down a frictionless inclined plane angled 30 degrees above the horizontal. The force accelerating the block down the plane is thus: a. zero, since there is no friction b. 9.8N c. 19.6N d. 33.9N e. 39.2N
*Wednesday, January 7, 2015 by Buck*

**Physics**

How fast would a 4.8 kg object slide down a frictionless incline of 10.3 degrees?
*Wednesday, January 7, 2015 by Paige*

**physics**

5000J of heat is supplied to 10kg of water at 30degrees. What will be the water's final temperature
*Wednesday, January 7, 2015 by arnold*

**physics**

A roller coaster car with a mass of 130 kg travels through a loop with a diameter of 20meters. What is the minimum speed at the top of the loop so that the car stays on the tracks? m= 130kg r= 10m v= ?
*Wednesday, January 7, 2015 by angelica*

**physics**

a pool ball weighing 2 kg is traveling at 30 degree at 0.8 meter hits another ball moving at 0.5 m/s at 180 degree. if the second ball leaves the collision at 0 degree and the first moves away at 150 degree, find the final velocity vectors of the balls.
*Wednesday, January 7, 2015 by winnsie*

**physics**

An object A, of mass 1 kg that is moving at a velocity of 6ms^-1 collides with a stationary object of mass 3kg. after the collision, the object move in the directions as shown. Determine the value of V1 and V2.
*Wednesday, January 7, 2015 by saima*

**physics**

A rocket with mass of 60,000 kg is placed on a launching platform verticlly. its engine is started and the rocket gives out gas at rate of 50kgs^-1 with a speed of 5000ms^-1 a) calculate the up trust force caused by the gas. b) can the rocket be launched at this moment?
*Wednesday, January 7, 2015 by saima*

**physics**

A rifle with weight of 30N fires a 5.0g bullet with a speed of 300ms^-1. a) Find the recoil speed of the rifle. b) if a700N man holds the rifle firmly against his shoulder, find the recoil speed of man and rifle.
*Wednesday, January 7, 2015 by saima*

**physics**

a girl is using a rope to pull a box that weighs 300N across a level surface with constant velocity. the rope makes an angle of 30 degree above the horizontal and the tension in the rope is 100N. What is the normal force of the floor on the box?
*Wednesday, January 7, 2015 by saima*

**physics please help**

A student throws a baseball from the ground to the top of the flag pole. If returns to the ground in 4.00s what it the height of the flagpole? Please show all work need help have a test comine up
*Tuesday, January 6, 2015 by greoge*

**phySICS NEED HELP ASAP**

Sally the bug has an initial speed of 20.0cm/s. She then accelerates at 8.00cm/s^2 for 5.00s. calculate sallys total displacement? which i did and got 200 cm Displacement during the 5th second? can you please help and show all work
*Tuesday, January 6, 2015 by sarah*

**PHYSICS NEED HELP ASAP**

A race car moving at 157km/hr decelerates at -7.00 m/s^2 to a speed of 75.0km/hr A) how long did this take? B) how many meters did the car travel during this deceleration? I attempted this problem many times and i don't seem to get the correct answer please show all work ...
*Tuesday, January 6, 2015 by sahar*

**physics**

A rifle bullet is fired at an angle of 28.3° below the horizontal with an initial velocity of 177 m/s from the top of a cliff 52.2 m high. How far from the base of the cliff does it strike the level ground below?
*Tuesday, January 6, 2015 by Natalie*

**physics**

Two blocks are placed at the ends of a horizontal massless board, as in the drawing. The board is kept from rotating and rests on a support that serves as an axis of rotation. The block on the right has a mass of 5.4 kg. Determine the magnitude of the angular acceleration when...
*Tuesday, January 6, 2015 by genius girl *

**Physics**

An object has a volume of 4.0m^3 and weighs 40,000 Newtons. What will be its weight in water?
*Tuesday, January 6, 2015 by Lucy*

**Physics**

What is the difference between scalar and vector quantities and what two methods are used to describe vectors? Answer: Scalar quantities measure only distance (speed) while vector quantities measure both distance and direction, ( which is specifically known s displacement?) I ...
*Tuesday, January 6, 2015 by Lucina*

**physics**

The small piston of a hydraulic lift has a diameter of 8 cm and its large piston has a diameter of 40cm. The lift raises a load of 15,000 Newtons. A. Determine the force that must be applied to the small piston. B. Determine the pressure applied to the fluid in the lift.
*Tuesday, January 6, 2015 by Lucy*

**Physics**

a rectangular box of negligible mass measures 5m long,1m wide and 0.5m high. How many kilograms of mass can be loaded into the box before it will sink in a freshwater lake?
*Tuesday, January 6, 2015 by Lee*

**Physics**

A person weighing 900 Newtons is standing on snowshoes. Each snowshoe has an area of 2500cm^2. What is the pressure on the snow?
*Tuesday, January 6, 2015 by jenn*

**physics**

A rock is given a KE of 2.00*10^4 J when it is launched vertically upward. If the rock reaches a height of 50m determine the mass of the rock.
*Tuesday, January 6, 2015 by moooose*

**physics**

A tugboat pulls a ship with a constant net horizontal force of 5.72 × 103 N and causes the ship to move through a harbor. How much work does the tugboat do on the ship if each moves a distance of 3.11 km ? Answer in units of J.
*Tuesday, January 6, 2015 by allan*

**physics**

A 18.4 kg block is dragged over a rough, horizontal surface by a constant force of 126 N acting at an angle of 34.1 ◦ above the horizontal. The block is displaced 20 m, and the coefficient of kinetic friction is 0.123. The acceleration of gravity is 9.8 m/s 2 .Find the ...
*Tuesday, January 6, 2015 by allan*

**Physics**

tarzan, mass 85 kg, swings from a tree on the end of a 20. m vine his feet touch the ground 4.0m below the tree. how fats was he moving when he reaches the ground
*Tuesday, January 6, 2015 by Anonymous*

**physics **

A race car moving at 157km/hr decelerates at -7.00 m/s^2 to a speed of 75.0km/hr A) how long did this take? B) how many meters did the car travel during this deceleration? I attempted this problem many times and i don't seem to get the correct answer please show all work ...
*Tuesday, January 6, 2015 by sahar*

**physics **

Sally the bug has an initial speed of 20.0cm/s. She then accelerates at 8.00cm/s^2 for 5.00s. calculate sallys total displacement? which i did and got 200 cm Displacement during the 5th second? can you please help and show all work
*Tuesday, January 6, 2015 by Georgy*

**physics please help**

A student throws a baseball from the ground to the top of the flag pole. If returns to the ground in 4.00s what it the height of the flagpole? Please show all work need help have a test comine up
*Tuesday, January 6, 2015 by Georgy*

**Physics**

A lunar lander in powered descent at 100 m above the surface of the moon slows down from a velocity of 20 m/s to 0.5 m/s at constant acceleration. Assume that the lander has a mass of 20,000 kg and that burning the fuel does not change the mass. Answer the following questions...
*Tuesday, January 6, 2015 by Anonymous*

**Physics**

A lunar lander in powered descent at 100 m above the surface of the moon slows down from a velocity of 20 m/s to 0.5 m/s at constant acceleration. Assume that the lander has a mass of 20,000 kg and that burning the fuel does not change the mass. Answer the following questions...
*Tuesday, January 6, 2015 by Z*

**Physics**

At time t = 0, a projectile is launched from ground level. At t = 2.00 s, it is displaced d = 53 m horizontally and h = 54 m vertically above the launch point. What are the (a) horizontal and (b) vertical components of the initial velocity of the projectile? (c) At the instant...
*Tuesday, January 6, 2015 by Barry*

**physics**

solve the magnitude of two force such that if any act at right angle resultant is 5kn while the act at angle60 their resultant is square 37
*Tuesday, January 6, 2015 by SEGUN*

**physics**

A 70 kg person is riding on a frictionless skateboard at 5 m/s. A friend facing him throws a 5 kg ball toward him at 20 m/s. What is his final speed after catching the ball?
*Tuesday, January 6, 2015 by Kareem*