Thursday

February 11, 2016
**Physics**

James Bond and the ever present bond girl are on a dirt bike escaping from a car load of bad guys. If we have the following conditions: James Bond’s mass is 84 Kg The Bond Girl is 48Kg The Dirt Bike’s mass is 113.6 Kg The tires on the dirt bike are 0.6m in diameter ...
*Tuesday, December 8, 2015 by Larry*

**physics**

A 150g iron ball is dropped into a cavity in a block of ice. The cavity is then found to contain 21g of water. Calculate the heat of fusion of ice.
*Tuesday, December 8, 2015 by omay*

**Physics **

A baseball player hits a home run over the left-field fence, which is 104 m from home plate. The ball is hit at a point 1.08 m directly above home plate, with an initial velocity directed 35.0° above the horizontal. By what distance does the baseball clear the 3.00 m high ...
*Tuesday, December 8, 2015 by Bill*

**Physics **

A brick is initially 12.90 cm high and an aluminum can is initially 12.91 cm high. By how much must their temperatures be raised in order for the brick and the can to have exactly the same height?
*Tuesday, December 8, 2015 by Dave*

**Physics **

A 1.05 liter flask contains a certain quantity of ideal gas at 305 K. Then an equal number of molecules of the same gas is added to the flask, after which the absolute pressure is 1.55 times its original value. What is the final temperature?
*Tuesday, December 8, 2015 by Dave*

**Physics **

By how much does the air pressure in a house increase if the house is sealed and the air temperature increases from 10.7° C to 21.0° C? The initial air pressure is 1.00 atmosphere.
*Tuesday, December 8, 2015 by Dave*

**Physics **

Find the volume occupied by 3.14 moles of an ideal gas at standard conditions of pressure and temperature (P = 1.00 atm, T = 273 K).
*Tuesday, December 8, 2015 by Dave*

**Physics **

A watertight car is submerged under water. What force is required to open a door of area 1.12 m2 if the average depth of water at the door is 1.50 m?
*Tuesday, December 8, 2015 by Dave*

**Physics **

A certain concrete will support a maximum compressive stress of 1.30 107 N/m2 before being crushed. A column of uniform width is to be made with this concrete. How tall can the column be if the stress in it at any point is not to exceed one half the maximum value? The weight ...
*Tuesday, December 8, 2015 by Dave*

**physics**

A box slides along a friction-less horizantal floor under the action of a constant applied force is the acceleration necessarily to be constant?
*Tuesday, December 8, 2015 by Marym*

**Physics **

A man doing a slow push-up is approximately in static equilibrium. His body is horizontal, with his weight of 750 N supported by his hands and feet, which are 1.36 m apart. One hand rests on a spring scale, which reads 268 N. If each hand bears an equal weight, how far from ...
*Tuesday, December 8, 2015 by Dave*

**College Physics**

How much energy is required to bring 10.0 grams of ice at -5.00 degrees to 105-degree steam? Assume the system is isolated so that no mass is lost to the surroundings
*Tuesday, December 8, 2015 by Jeff*

**Physics**

A ceiling fan of radius 1.0 m is rotating with a frequency of 300 RPM. How fast (in m/sec) is the tip of one of the blades moving?
*Tuesday, December 8, 2015 by Anonymous*

**Physics**

A 45.0 kg diver steps off a 8.0 m high diving board and drops straight down into the water. If the diver comes to rest 5.0 m below the surface of the water, determine the average resistance force exerted on the diver by the water.
*Tuesday, December 8, 2015 by Help!!!!*

**chemistry physics**

Which following assertions are true ? - unanswered 13C NMR is more sensitive than 1H NMR because of the 1.1% natural abundance of 13C nuclei. 13C nuclei have a ½ spin and can be detected in NMR, opposite to more abundant 12C nuclei. 13C NMR requires a different ...
*Tuesday, December 8, 2015 by Abd*

**physics**

A) Assume the mass of a pendulum is 3kg. Calculate the work done by the pendulum on the mass from 0 degrees to 180 degrees ( you will need to integrate with respects to d(theta ) instead of dx given: the mass at the end of the string experiences a restoring force given by: F=-...
*Tuesday, December 8, 2015 by Spice*

**Physics**

A 50 gram mass vibrates in SHM at the end of a spring. The amplitude of the motion is 0.12 meters, and the period is T= 1.70 seconds. Find: The maximum acceleration of the mass? The speed of the mass when the displacement is 0.06 meters?
*Monday, December 7, 2015 by Justin *

**physics**

A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 515 N. As the drawing shows, she is closer to the left cliff than to the right cliff, with the result that the tensions in the left and right sides of the rope are not the ...
*Monday, December 7, 2015 by Elijah*

**Physics**

A drone capable of flying north at a speed of 4.0 m/s in still air is attempting to fly across a field 120 m wide. There is a wind blowing at 5.0 m/s [E]. a) Find the drone's velocity relative to the ground. b) Find the time it takes the drone to cross the field.
*Monday, December 7, 2015 by Taha*

**physics**

The acceleration of gravity is 10 m/s2. What is the acceleration of a 46 kg pail of cement that is pulled upward (not sideways) with a force of 478 N? Answer in units of m/s2.
*Monday, December 7, 2015 by zach*

**physics**

A pinball machine launches a 139 g ball with a spring-driven plunger. The game board is inclined at 8 ◦ above the horizontal. Assume: The plunger’s mass and frictional effects are negligible. The acceleration of gravity is 9.8 m/s2 Find the force constant k of the ...
*Monday, December 7, 2015 by Anonymous*

**physics**

On planet X, an object weighs 18.1 N. On planet B where the magnitude of the free-fall acceleration is 1.28 g (where g = 9.8 m/s 2 is the gravitational acceleration on Earth), the object weighs 37.9 N. The acceleration of gravity is 9.8 m/s 2 . What is the mass of the object ...
*Monday, December 7, 2015 by zach*

**Physics**

1. A 55.0 kg pole vaulter running at 11.0 m/s vaults over the bar. Assuming that the vaulter's horizontal component of velocity over the bar is 1.0 m/s and disregarding air resistance, how high was the jump (include units)? 2. A 71 kg person rolls on a 2 kg skateboard with...
*Monday, December 7, 2015 by Help!!!!*

**physics**

if a worker pushes a box 3 times as far as you do and exerts double the force you applied, which one of you does more work and by how much?
*Monday, December 7, 2015 by bshayer*

**physics **

A) Assume the mass of a pendulum is 3kg. Calculate the work done by the pendulum on the mass from 0 degrees to 180 degrees ( you will need to integrate with respects to d(theta ) instead of dx given: the mass at the end of the string experiences a restoring force given by: F=-...
*Monday, December 7, 2015 by Spice*

**Physics Help**

A dumbbell has a mass m on either end of a rod of length 2a. The center of the dumbbell is a distance r from the center of the Earth, and the dumbbell is aligned radially. If r≫a, the difference in the gravitational force exerted on the two masses by the Earth is ...
*Monday, December 7, 2015 by jacob*

**physics**

A 56-kg student runs at 4.2 m/s , grabs a hanging 10.0-m-long rope, and swings out over a lake (Figure 1) . He releases the rope when his velocity is zero. What is the angle θ when he releases the rope? What is the tension in the rope just before he releases it? What is ...
*Monday, December 7, 2015 by Andres *

**Physics**

A star the size of our Sun runs out of nuclear fuel and, without losing mass, collapses to a white dwarf star the size of our Earth. The radius of our Sun is 6.96×108m , the radius of Earth is 6.37×106m . If the star initially rotates at the same rate as our Sun, ...
*Sunday, December 6, 2015 by Viert*

**Physics**

A fish tank has dimensions 46 cm wide by 1.0 m long by 0.70 m high. If the filter should process all the water in the tank once every 3.0 h, what should the flow speed be in the 3.0-cm-diameter input tube for the filter? I tried using Q=v/t and Q=vA... V=0.46m*1m*0.7m=0.322m^3...
*Sunday, December 6, 2015 by Ashley*

**Physics**

A man which travel due north in other to cross a river 5km wide flowing due east at 3km/h. If he can roll at 10km/h in still water. Find either by scale drawing or by calculation (1) the direction in which he must head is boat in order to get to his destination (2) the ...
*Sunday, December 6, 2015 by Dickson*

**Physics**

A steel bar has an initial length of 40 meters when the temperature is 20 oC. At what final temperature will the steel bar have a final length of 40.01 meters? The coefficient of linear expansion of steel is 12E-6 (1/C).
*Sunday, December 6, 2015 by Justin *

**Physics**

A certain diving bell for use in the ocean has a square window measuring 0.250 m on each side. The inside of the bell is pressurized and maintained at a pressure of 2.00 atm. The mass density of seawater is 1025 kg/m3. How deep can this bell be lowered before the vector sum of...
*Sunday, December 6, 2015 by Ethan*

**physics**

1) A 70 kg woman dives from a 2.5 m high diving board. The gravitational field strength is 10 N/kg. Describe whether she gains or loses gravitational potential energy, and calculate the change in gravitational potential energy
*Sunday, December 6, 2015 by kate*

**Algebra 1, Physics**

Muriel and Connie are playing a game of catch. They decided it would be fun to stand on different sides of the building and throw the ball back and forth. Muriel can throw the ball with a velocity of 14 m/s, and Connie can throw with a velocity of 16 m/s. Each stands 10 m from...
*Sunday, December 6, 2015 by Missy*

**physics**

Two plus lenses have focal lengths in the ratio 7:1. When placed together in close contact the focal length of the combination is +12.5cm. What are the focal lengths of the two lenses?
*Sunday, December 6, 2015 by shaky*

**physics**

When a body hanging from a spring balance is immersed in water it floats just below the surface of water and shows 100g loss in its weight (I) what is the weight of the body in water? (Ii) what is the weight of the body in air? (Iii) what is the up thrust on the body? (Iv) ...
*Sunday, December 6, 2015 by farheen fathima*

**Physics**

Some bags (the mass of each bag is 50 kg) are put in the truck of 200 kg mass. After applying 400 N force the car started moving with 1 m/s accelaration.Now my question is'', how many Bags are in the truck?
*Sunday, December 6, 2015 by Akhter*

**Ap physics**

fine sand moves through pipes just like fluid. a sandblasting machine moves fine sand through a pipe of inner diameter 2.8 cm at 75L/minutes. the sand comes out from two identical jets at speed 45 m/s. calculated the diameter of the holes through which the jets come out.(...
*Sunday, December 6, 2015 by jay*

**physics 20**

What is the true weight of a 60-kg astronaut on: a) the surface of Mars? b) the surface of Saturn? given: mass of Mars= 6.42x10^23 mass of Saturn= 5.69x10^26
*Sunday, December 6, 2015 by MJ*

**Physics**

A large statue in a crate is being moved. The mass of the statue and the crate is 150 kg. As the statue slides down a ramp inclined at 40.0°, the curator pushes up, parallel to the ramp’s surface, so that the crate does not accelerate. If the statue slides 3 m down ...
*Saturday, December 5, 2015 by Maddy*

**Physics**

Calculate the true weight of a 60 kg astronaut on: a) the surface of Mars, and b)the surface of Saturn. Mass of Mars= 6.42x10^23 Mass of Saturn= 5.69x10^26
*Saturday, December 5, 2015 by mj*

**physics**

A 48-kg girl stands on a 8-kg wagon holding two 19.5-kg weights. She throws the weights horizontally off the back of the wagon at a speed of 9.0 m/s relative to herself. - Assuming that the wagon was at rest initially, what is the speed of the girl after she throws both ...
*Saturday, December 5, 2015 by maria*

**physics**

A 48-kg girl stands on a 8-kg wagon holding two 19.5-kg weights. She throws the weights horizontally off the back of the wagon at a speed of 9.0 m/s relative to herself. Assuming that the wagon was at rest initially, what is the speed with which the girl will move after she ...
*Saturday, December 5, 2015 by sara*

**Physics**

The Volume of air in a car tire is 800cm^3 and the pressure is 290kPa. Determine the volume the air would occupy as soon as the tire bursts on a day when the atmospheric pressure is 102kPa. (Assume that the temperature remains constant and assume an ideal gas)
*Saturday, December 5, 2015 by Adam*

**Physics**

The Volume of air in a car tire is 800cm^3 and the pressure is 290kPa. Determine the volume the air would occupy as soon as the tire bursts on a day when the atmospheric pressure is 204kPa. (Assume that the temperature remains constant and assume an ideal gas)
*Saturday, December 5, 2015 by Adam*

**Physics/Science**

A steel bar reaches a temperature of 420 degrees celsius after it has been welded. Over the next 50 minutes the steel bar cools to 30 degrees celsius. What is the rate of temperature change of the iron?
*Saturday, December 5, 2015 by John Doswell*

**Physics**

A 35-g block of ice at -14°C is dropped into a calorimeter (of negligible heat capacity) containing 400 g of water at 0°C. When the system reaches equilibrium, how much ice is left in the calorimeter? The specific heat of ice is 2090 J(kg K) and the latent heat of ...
*Saturday, December 5, 2015 by Justin *

**Physics/Science**

After a gas furnace comes on, it takes 45 minutes for a room's temperature to warm 17 degrees Celsius to 22 degrees Celsius. What is the rate of temperature change of the air in the room?
*Saturday, December 5, 2015 by John Doswell*

**physics**

A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 83.0-kg water-skier has an initial speed of 5.9 m/s. Later, the speed increases to 11.4 m/s. Determine the work done by the net external force ...
*Saturday, December 5, 2015 by luis*

**Physics**

At the start of a road trip, the pressure of the air in a car tyre is 276kPa and the temperature is 12.0 degrees celsius. After driving for some time the pressure in the tyre is now 303kPa. Assuming that the volume of the air inside the tire remains constant, determine the new...
*Saturday, December 5, 2015 by Joseph*

**physics**

The weight of an object on earth is 20 newton if the object put 6400km above from the earth so what was the weight of the object if the radius of earth is 6400 km
*Saturday, December 5, 2015 by naina*

**PHYSICS**

The static pressure in horizontal pipeline is 43000Pa and the cross sectional area is 20cm. The fluid is said to be incompressible and non viscous and has density of 1000kg/m. Calculate:- -velocity -The volume flow rate in a pipe
*Saturday, December 5, 2015 by MORE*

**physics **

A beam 6 m long is simply supported at the ends,and carries a uniform distributed load of 1500kg/m (including its own weight ) and three concentrated loads of 1000,2000 and 3000 kg acting respectively at the left quarter point,centre point and right quarter point. Draw the ...
*Saturday, December 5, 2015 by Marfo *

**Physics**

Using the definition of work, get a job on the tension of the spring with a spring constant 300,0 H / m 20,0sm. The spring stiffness of the spring gun with 400 Nm pro- ryadili bullet clenched spring by 5.0 cm. Weight 10.0 g bullet from the spray gun shot up. Determine the ...
*Saturday, December 5, 2015 by Aung*

**physics**

Orders of magnitude 2: What is the energy of a photon of wavelength λ=780 nm. Please give the energy in K⋅kB units this time (to within 1%). This is an equivalent temperature unit: (Tequiv=E/kB), with the temperature in Kelvin (K), and kB is the Boltzmann constant. ...
*Saturday, December 5, 2015 by Abd*

**physics**

Orders of magnitude 4: Assume again a Rubidium atom (mass m=87⋅u) is initially at rest. Again it then absorbs a photon of wavelength λ=780 nm. What is the kinetic energy Ekin of the atom after this process? Please give the energy in μK⋅kB units. This is ...
*Saturday, December 5, 2015 by Abd*

**physics**

If you push a box for a distance of one meter with a force of 4,187 newtons How many calories have you used?
*Friday, December 4, 2015 by anonimous*

**Physics**

A gas cylinder has a volume on 200l, and contains Nitrogen at a pressure of 200kPa and a temperature of 290 degrees Kelvin. The molar mass of Nitrogen is 14.0067g. Calculate. The number of moles in the gas cylinder?
*Friday, December 4, 2015 by John*

**Physics**

The total U.S. consumption of electricity in a particular year was 5.0 x 1012 kilowatt-hours. What is the mass equivalence of this amount of energy? Show all calculations leading to an answer.
*Friday, December 4, 2015 by Lexi *

**Physics**

Suppose the thickness of an oil film on water is just the right thickness for canceling red light. What color will your eye see? Explain using 3 – 4 complete sentences.
*Friday, December 4, 2015 by Lexi*

**Physics**

In a lab experiment, 45 grams of a metal are heated from 22⁰C to 78⁰C by the addition of 450 J of heat. What is the specific heat of the metal? Show all calculations leading to an answer.
*Friday, December 4, 2015 by lexi*

**physics**

A 189.4 kg uniform, horizontal beam is hinged at one end and at the other is supported by a cable that is at 37 degrees to the vertical. The beam is 3.85 m long. Calculate the magnitude of the force at the hinge.
*Friday, December 4, 2015 by S*

**Physics, Statistics**

Consider a series of 8 flips of a fair coin. (a) Calculate the probabilities for obtaining 0-8 heads. We will consider each of these nine outcomes to be macrostates of the system. (b) Calculate the entropy for each of these macrostates. I was able to figure out part A, but I&#...
*Friday, December 4, 2015 by Heidi*

**Physics**

Consider eight, eight-cubic centimeter (8 cm3) sugar cubes stacked so that they form a single 2 x 2 x 2 cube. How does the surface area of the single, large cube compare to the total surface area of the individual eight cubes? Report your answer as a ratio. Be sure to show all...
*Friday, December 4, 2015 by Ariel*

**Physics **

A horizontal water pipe goes from a large diameter to a small diameter and then back to the first diameter as shown in the figure below. The level of water (8cm in the larger tube and 4 cm in the constricted tube) in the small vertical tubes provides us with information about ...
*Friday, December 4, 2015 by Anna*

**Physics**

A satellite has a mass of 6090 kg and is in a circular orbit 4.63 × 105 m above the surface of a planet. The period of the orbit is 2.4 hours. The radius of the planet is 4.86 × 106 m. What would be the true weight of the satellite if it were at rest on the planet...
*Friday, December 4, 2015 by Tim*

**Physics**

A 5000 kg truck rear ends a 2500 kg car. Both vehicles applied brakes at the moment of the impact and began to skid. After the impact, the acceleration of the truck is -2 m/s and the acceleration of the car is -3 m/s. If the car skid for 30 m and the truck for 2 m, how fast ...
*Friday, December 4, 2015 by Karen *

**Physics**

A cylinder of gas is compressed by a piston from an initial volume of 125 liters to a final volume of 90 liters. The compression occurs at constant pressure, and the work done on the gas by the piston is 104 joules. What is the gas pressure during the compression? (1 liter = ...
*Friday, December 4, 2015 by Johnny Black*

**Physics**

A child and sled with a combined mass of 45.0 kg slide down a frictionless hill. If the sled starts from rest and has a speed of 8.0 m/s at the bottom, what is the height of the hill (include units)?
*Friday, December 4, 2015 by Help!!!!*

**statistics**

a student gets the following grades in his 5 subjects: 87 for calculu; 82 for Physics; 79 for Chemistry; 81 for english; 83 for history. Compute the weighted mean if the weights for the 5 subjects are 5,4,4,3, and 3, repectively
*Friday, December 4, 2015 by wew*

**Physics**

The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle of 300 with the resultant, find its magnitude
*Friday, December 4, 2015 by Olamilekan*

**AP Physics**

How fast (in rpm) must a centrifuge rotate if a particle 6.0 cm from the axis of rotation is to experience an acceleration of 130000 g's
*Friday, December 4, 2015 by -*

**AP Physics**

A fire engine must lift 30 kg of water a vertical distance of 20 m each second. What is the amount of power needed for the water pump for this fire hose? Is the answer 5880W? If yes, why so?
*Friday, December 4, 2015 by Collins*

**AP Physics**

The Eiffel Tower is 300 m tall. When you are standing at a certain place in Paris, it subtends an angle of 7.0°. How far are you, then, from the Eiffel Tower?
*Thursday, December 3, 2015 by -*

**physics**

A hiker begins a trip by first walking 25.0 km 45.0° south of east from her base camp.On the second day she walks 40.0 km in a direction 60.0° north of east, at which point she discovers a forest ranger’s tower.Find the magnitude of the displacement from base camp...
*Thursday, December 3, 2015 by jasmeen*

**Physics Help Needed**

Two blocks are connected by massless string that is wrapped around a pulley. Block 1 has a mass m1=6.90 kg, block 2 has a mass m2=2.30 kg, while the pulley has a mass of 1.70 kg and a radius of 12.2 cm. The pulley is frictionless, and the surface mass 1 is on is also ...
*Thursday, December 3, 2015 by Anonymous*

**physics**

Calculate the gravitational force in N between a 17.3 kg object and 14.8 kg object that are separated by 1.02 m
*Thursday, December 3, 2015 by ciara*

**Physics**

Help Needed Please... After changing a tire on your car, you need to tighten one of the lug nuts to the proper specified torque of 49.0 N m. How much force is needed if you're pushing down on the end of the 39.0 cm long torque wrench at an angle of 120° with respect to...
*Thursday, December 3, 2015 by Anonymous*

**Physics**

Help Needed Please... After changing a tire on your car, you need to tighten one of the lug nuts to the proper specified torque of 49.0 N m. How much force is needed if you're pushing down on the end of the 39.0 cm long torque wrench at an angle of 120° with respect to...
*Thursday, December 3, 2015 by Anonymous*

**Physics**

On a frictionless horizontal air table, puck A (with mass 0.255 kg ) is moving toward puck B (with mass 0.365 kg ), which is initially at rest. After the collision, puck A has velocity 0.118 m/s to the left, and puck B has velocity 0.649 m/s to the right. What was the speed ...
*Thursday, December 3, 2015 by Amanda*

**Physics**

Two ice skaters stand at rest in the center of an ice rink. When they push off against one another the 61-kg skater acquires a speed of 0.63 m/s . If the speed of the other skater is 0.86 m/s , what is this skater's mass?
*Thursday, December 3, 2015 by Amanda*

**Physics**

A 30-06 caliber hunting rifle fires a bullet of mass 0.0101 kg with a velocity of 279 m/s to the right. The rifle has a mass of 3.46 kg. What is the recoil speed of the rifle as the bullet leaves the rifle? Answer in units of m/s.
*Thursday, December 3, 2015 by Elisabeth*

**physics**

A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H = 32.0 m above sea level, directed at an angle theta = 47.3° above the horizontal, and with a speed v = 35.5 m/s. Assuming that air friction ...
*Thursday, December 3, 2015 by danniel*

**Physics**

A stone is aimed at a cliff of height h with an initial speed of v = 36.0 m/s directed 75.0° above the horizontal, as shown in the Figure below by the arrow. The stone strikes at A, 6.25 s after launching. What is the height of the cliff?
*Thursday, December 3, 2015 by Kevin*

**Please Check My Work: College Physics**

Determine the minimum angle at which a roadbed should be banked so that a car traveling at 20 m/s can safely negotiate the curve if the radius of the curve is 200m. * Data: v=20 m/s r=200m *Formula TAN(theta)=v^2/rg *Solution TAN(theta)=(20 m/s)^2/(200m)(9.8 m/s^2) TAN(theta...
*Thursday, December 3, 2015 by Jose Luis*

**Please Check: College Physics**

A 8 kg block is moving with an initial speed of 6 m/s on a rough horizontal surface. If the force is 12 N, approximately how far does the block travel before it stops? *I have: V^2=Vi^2+2ax 0=(6 m/s)^2 + 2(-9.8 m/s^2)(x) -36 m^2/s^2 = -19.6 m/s^2(x) x = 1.83 m. *Is this ...
*Thursday, December 3, 2015 by Jose Luis*

**physics**

a 2.0 kg solid mass has an apparent weight 12.34N when totally immersed in water. Calculate the apparent weight of the body when totally immersed in a liquid of density 0.78
*Thursday, December 3, 2015 by jay*

**PHYSICS**

two masses m1 = 12 kg and m2 = 13 kg are connected by a light inextensible string passing over a frictionless pulley. Find (a) acceleration of the system when released from rest (b) tension in the string ?
*Thursday, December 3, 2015 by Camz*

**physics **

particle A makes a elastic collision with another particle B at rest.they fly apart in opposite directions with equal speed.if their masses are Ma and Mb respectively ,then relations between Ma and Mb.
*Thursday, December 3, 2015 by Bn sharma*

**physics**

ahmed throws a ball at initial velocity of 36 meter per second.assuming the ball is caught at the same height at which it was released. calculate the maximum distance the ball can reach.
*Thursday, December 3, 2015 by nuzhat*

**physics**

a brick of mass 2.0kg is dropped from a rest position 5.0m above the ground what is its velocity at a height of 3.0m above the ground [g=9.8meter per second square
*Thursday, December 3, 2015 by asma*

**Physics Check My Work Please**

Determine the minimum angle at which a roadbed should be banked so that a car traveling at 20 m/s can safely negotiate the curve if the radius of the curve is 200m. * Data: v=20 m/s r=200m *Formula TAN(theta)=v^2/rg *Solution TAN(theta)=(20 m/s)^2/(200m)(9.8 m/s^2) TAN(theta...
*Thursday, December 3, 2015 by Jose Luis*

**Physics Check My Work Please**

A 8 kg block is moving with an initial speed of 6 m/s on a rough horizontal surface. If the force is 12 N, approximately how far does the block travel before it stops? *I have: V^2=Vi^2+2ax 0=(6 m/s)^2 + 2(-9.8 m/s^2)(x) -36 m^2/s^2 = -19.6 m/s^2(x) x = 1.83 m. *Is this ...
*Thursday, December 3, 2015 by Jose Luis*

**physics**

two people run a race around a track. One is in the first lane and the other is in the 7th lane. they both start at the same start line. They both finish in the same amount of time, but the runner in the outside lane is determined to be the winner. Wh?
*Wednesday, December 2, 2015 by Anonymous*

**Physics**

In a typical golf swing, the club is in contact with the ball for about 0.0010s. If the 45-g ball acquires a speed of 59m/s, estimate the magnitude of the force exerted by the club on the ball.
*Wednesday, December 2, 2015 by Amanda*

**Physics**

Two ice skaters stand at rest in the center of an ice rink. When they push off against one another the 61-kg skater acquires a speed of 0.63 m/s . If the speed of the other skater is 0.86 m/s , what is this skater's mass?
*Wednesday, December 2, 2015 by Amanda*

**Physics**

A punter drops a .43 kg football from rest vertically 1 meter down onto his foot. The ball leaves his foot with a speed of 18m/s at an angle of 55* above the horizontal. What is the impulse delivered by the foot (magnitude and direction)?
*Wednesday, December 2, 2015 by Rob*

**Physics**

A child and sled with a combined mass of 45.0 kg slide down a frictionless hill. If the sled starts from rest and has a speed of 8.0 m/s at the bottom, what is the height of the hill (include units)?
*Wednesday, December 2, 2015 by Mariah*

**Physics**

You jump from a height of 1.0m from the surface of the Earth. The Earth will actually move a bit as you land. a.) Explain Why b.) Estimate the distance the Earth moves, listing any assumptions you make
*Wednesday, December 2, 2015 by Jack*

**Physics**

A stone is aimed at a cliff of height h with an initial speed of v = 54.0 m/s directed 55.0° above the horizontal, as shown in the Figure below by the arrow. The stone strikes at A, 7.31 s after launching. What is the height of the cliff? What is the maximum height H ...
*Wednesday, December 2, 2015 by Anonymous*