Sunday
August 2, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
How much work is needed to move a -8.00 uC charge from the ground to a point whose potential is +75.0V ? I know -8.00 uc = -0.8 x 10^-6 then I used W = Fd but I can't seems to get right answer any hint is appreciated.
Wednesday, May 13, 2015 by john

PHYSICS HELP!!
A drop hammer of mass 120 kg falls 2.5 m onto a pile of mass 250 kg and drives it 70 mm into the ground. Calculate: a.The velocity with which the hammer strikes the pile (use the conservation of energy principle) b.The velocity immediately after the impact(use the conservation...
Tuesday, May 12, 2015 by baz

PHYSICS HELP!!
A motorised gearbox has a reduction ratio of 50:1. The power input to the gearbox is 5 kW at 1440 RPM. The gearbox efficiency is 85% under maximum load conditions. The output shaft of the gearbox is attached to a winch drum of pitch diameter 220 mm and is used to hoist a load...
Tuesday, May 12, 2015 by baz

PHYSICS
The force of repulsion between two identical negative charges is 3.95 N, when the charges are 35.0 cm apart. What is the magnitude of these charges?
Tuesday, May 12, 2015 by Jonny

Electronics, Physics, Math
5. A circuit is supplied with 30 VDC and contains three resistors connected in series. The value or R1 is 80Ω, the value of R2 is 1,000Ω , and the value of R3 is 4,200Ω . What is the voltage drop across R2? A. 5.68 V B. 2.14 V C. 4.61 V D. 6.82 V I keep coming ...
Tuesday, May 12, 2015 by Vicki

Physics
a hockey player makes a slap shot, exerting a constant force of 25.0N on the puck for .16 seconds. What is the magnitude of the impulse given to the puck
Tuesday, May 12, 2015 by Morgan Hopp

Physics (optics)
A ray of light traveling in air strikes the midpoint of one face of an equiangular glass prism (n = 1.74) at an angle of exactly 30.0â—¦ Trace the path of the light ray through the glass and find the angle of incidence of the ray at the bottom of the prism. ...
Tuesday, May 12, 2015 by Dave

Physics
If a small planet were discovered whose orbital period was twice that of Earth, how many times farther from the Sun would this planet be? The answer for this one is 1.6 earth radii, but I can't seems to get solution to find the answer. I would appreciate for any hint or help.
Tuesday, May 12, 2015 by john

physics
A skateboarder starts up a 1.30m high, 25.0° ramp at a speed of 6.70m/s. The skateboard wheels roll without friction. How far from the end of the ramp does the skateboarder touch down?
Tuesday, May 12, 2015 by Anonymous

physics
. A 1030-kg car going 3.4 m/s through a parking lot hits and sticks to the bumper of a stationary 1140-kg car. Find the speed of the joined cars immediately after the collision.
Tuesday, May 12, 2015 by derrelk

physics
a 22 kilo ohm resistor having a tolerance of 10% has failed. you have on hand five resistors, valued at 120, 220, 47, 33 and 120 kilo ohm respectively. what combination of these would you choose to connect in parallel to replace the failed component?
Tuesday, May 12, 2015 by lou

Electronics, Physics
In a circuit, a 10 Ω resistor is connected in series to a parallel group containing a 60 Ω resistor and a 5 Ω resistor. What is the total resistance in this circuit? A formula and explanation would be great!
Tuesday, May 12, 2015 by Vicki

Physics
What is the greatest safe speed, without skidding, that a 1700 kg car can have on a level curve of radius 215 meters if Mk=0.4 and Ms=.85? The correct answer is 42.3 but idk how to get it.
Tuesday, May 12, 2015 by Victoria

Physics
A 4 kg mass is held at rest against a vertical wall by force F, acting perpendicular to the wall. If Mk=.25 and Ms=.6, what is the minimum force that will keep the mass from moving?
Tuesday, May 12, 2015 by Victoria

Physics
What is the greatest safe speed, without skidding, that a 1700 kg car can have on a level curve of radius 215 meters if Mk=0.4 and Ms=.85? Answer=42.3 I tried using the equation mv^2/r=mg+Mk.
Tuesday, May 12, 2015 by Victoria

Physics
Does displacement always have to include angles and direction? For example a man travels 3 m (N) and 4m (E). Can you just put 5m for displacement or do you have to put the angle and direction? Explain why
Monday, May 11, 2015 by Anonymous

Physics
Does displacement always have to include angles and direction? For example a man travels 3 m (N) and 4m (E). Can you just put 5m for displacement or do you have to put the angle and direction? Explain why.
Monday, May 11, 2015 by Anonymous

Physics
A pendulum swings back and forth up to a maximum height of 1.52 m. Neglecting friction, what is the speed of the pendulum at the lowest position. a) 2.7 m/s b) 3.9 m/s c) 5.5 m/s d) 30. m/s I thought the answer would be 0 m/s because it wouldn't move at the lowest position...
Monday, May 11, 2015 by Megan

PHYSICS HELP!!
A drop hammer of mass 120 kg falls 2.5 m onto a pile of mass 250 kg and drives it 70 mm into the ground. Calculate: a.The velocity with which the hammer strikes the pile (use the conservation of energy principle) b.The velocity immediately after the impact(use the conservation...
Monday, May 11, 2015 by baz

PHYSICS HELP!!
A motorised gearbox has a reduction ratio of 50:1. The power input to the gearbox is 5 kW at 1440 RPM. The gearbox efficiency is 85% under maximum load conditions. The output shaft of the gearbox is attached to a winch drum of pitch diameter 220 mm and is used to hoist a load...
Monday, May 11, 2015 by baz

physics
an object of mass mf to fall a distance L, giving its energy to raise the bus of mass 0.50 kg. The focal point of the lab was the effect of an inclined plane (a ramp). What is the effect of a ramp on the force necessary to raise an object a vertical distance H? What is the ...
Monday, May 11, 2015 by jake

physics questions
1. The batteries in a digital alarm clock provide a terminal voltage of 9 V. What is the potential difference across the entire clock current? A. 4.5 V B. 18.0 V C. 9.0 V D. 6.0 V **C is my answer 2. Why does the earth have a magnetic declination? a. the earth's axis of ...
Monday, May 11, 2015 by nnd

Physics
Two resistors have resistances R1 and R2. When the resistors are connected in series to a 12.4-V battery, the current from the battery is 2.13 A. When the resistors are connected in parallel to the battery, the total current from the battery is 9.01 A. Determine R1 and R2. (...
Monday, May 11, 2015 by Abigail

Physics
two stars with equal mass of 4.0x10^15 kg are separated by a distance of 2 km. They are moving in circular obits around the middle between the two stars. What is the speed of the stars?
Sunday, May 10, 2015 by Ricky

Physics
A girl swings on a playground swing in such a way that at her highest point she is 4.1 m from the ground, while at her lowest point she is 0.8 m from the ground.What is her maximum speed? The acceleration due to gravity is 9.8 m/s2 .Answer in units of m/s.
Sunday, May 10, 2015 by Anonymous

physics
A bar of gold measures 0.15 m × 0.050 m × 0.050 m. How many gallons of water have the same mass as this bar?
Sunday, May 10, 2015 by Anonymous

physics
sixty complete waves passes a particular point in 4 seconds if the distance between 3 successive troughs of the wave is 15m calculate the speed of the wave
Sunday, May 10, 2015 by eniola pelumi

physics
sixty complete waves passes a particular point in 4 seconds if the distance between 3 successive troughs of the wave is 15m.calculate the speed of the wave
Sunday, May 10, 2015 by Anonymous

Physics
Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is whisked away in a space ship at 90% of the speed of light. After 65 years they are reunited. Will they look the same? Show proof of your answer through ...
Sunday, May 10, 2015 by Brian

Physics
Which of the following is correct for the two coherent light waves to produce zero light? The light waves should travel in perpendicular directions. The light waves are in phase with each other. The light waves are out of phase with each other. The light waves should pass ...
Sunday, May 10, 2015 by Brian

Physics
Laser light of wavelength 632nm is incident on a diffraction grating having 600 lines per mm. Determine the angular separation between the first and second order maxima
Sunday, May 10, 2015 by Felicia

physics
Two identical balls each of mass 0.1*10-3kg carry identical charges and are suspended by two non conducting threads of equal length. At equilibrium they position themselves. Calculate the charge on either ball.
Saturday, May 9, 2015 by shivangi

Physics
Calculate the tension in the string if a single pulley of velocity ratio 5 is used to raise a body of mass 200g through a distance of 4cm.
Saturday, May 9, 2015 by John

Physics
A car travels 300 m [N] along a road, then turns a corner and drives an additional 400 m [E]. Draw a vector diagram of the path travelled by the car, and then calculate the car's distance travelled and its displacement. The displacement is 500m and the distance is 1200m. ...
Saturday, May 9, 2015 by Anonymous

physics
If a small planet were discovered whose orbital period was twice that of Earth, how many times farther from the Sun would this planet be?
Saturday, May 9, 2015 by Jon

Physics
The speed of light is about 3.00 x 10 to the power of 5 km/s. It takes approx. 1.28 seconds for light reflected from the moon to reach Earth. What is the average distance from Earth to the moon? Thank you
Friday, May 8, 2015 by Steph

Physics
A heat engine is 20% efficient. If it loses 800 J to the cooling system and exhaust during each cycle, the work done by the engine is: 200 J 1000 J 800 J 20 J
Friday, May 8, 2015 by Steve

Physics
If ∆Q is the heat supplied to a gas so that the internal energy of the system increases by ∆U, then the work done ∆W by the gas is equal to: ∆Q – ∆U ∆Q + ∆U ∆Q x ∆U ∆U/∆Q
Friday, May 8, 2015 by Gary

Physics
How many kg of ice needs to be added to 1.31 kg of water at 64.9°C to cool the water to 14.9°C when the Latent heat of ice = 80 kcal/kg?
Friday, May 8, 2015 by Steve

Physics
You know there are 1,609 metres in a mile. The number of feet in a mile is 5,280. Use these equalities to answer hoe many centimetres equals once inch. Thank you.
Friday, May 8, 2015 by Steph

Physics
How far can a person run in 15minutes if he or she runs at an average of 16km/hr? Thank you
Friday, May 8, 2015 by Steph

Physics
The average speed of a car was 60m/s by the time it reached the finish line. The car moved in a straight line and travelled from the starting line to the finish line in 8.0 sec. How far was the finish line? d = v x t d = 60 x 8 = 480 metres. Thank you
Friday, May 8, 2015 by Steph

Physics
The space shuttle releases a space telescope into orbit around the earth. The telescope is traveling at a speed of 1700m/s in 25 seconds. What is the distance of the satellite? d = v x t d = 1700 x 25 = Is that the correct formula? Thank you.
Friday, May 8, 2015 by Steph

physics
a bullet fired with a speed of 150 m/sec from car whose velocity is 25/3 m/sec to car next to it whose velocity is 50 m/sec.what is velocity of bullet with respect to ground?
Thursday, May 7, 2015 by vishal

Physics Electric Circuits
3. A 15.0 ohm resistor is connected in series to a 120 V generator and two 10.0 ohm resistors that are connected in parallel to each other. b) What is the current through the 15.0 ohm resistor? c) What is the current through one of the 10.0 ohm resistors? b- I did 120 V/15.0 ...
Thursday, May 7, 2015 by Bridget

physics
A rock falls off the edge of a cliff and strikes the ground after 3.8 s. What is the height of the cliff? Assume air resistance is negligible
Thursday, May 7, 2015 by angela

physics
A ball is thrown straight upward from ground level with a velocity of 41 m/s How much time passes before the ball strikes the ground? Disregard air resistance.
Thursday, May 7, 2015 by angela

PHYSICS
Consider a classroom 10.0m long by 6.0m wide by 4.0m high at "room temperature" 20.C and 1.0 atmosphere. A) How many moles of gas are contained in the room? B) Assuming an average molecular weight of 28, what is the mass of the room air?
Thursday, May 7, 2015 by Physics

Physics
Suppose you're an astronaut and you're sitting in a 6000kg space capsule riding on a 4000 m x 8000 m sail (whose mass is included in the 6000 kg). You're orbiting in the vicinity of a distant bright hot star giving off light with an intensity 8 x 10^9 W/m^2 at a ...
Thursday, May 7, 2015 by M

Physics
Suppose two conducting wires each of mass 25g and length 40m are both hanging from a support beam. When the circuit is turned on, the wires repel each other so that the angle between the supporting strings is 30 degrees at a height 5cm below the support beam. A. Are the ...
Thursday, May 7, 2015 by M

Physics
Suppose a light wave is in the visible spectrum, with frequency 740 THz(which will have a deep purple color). What will be the ratio of the electric to magnetic fields constitute the light wave? What fraction of the total energy is conveyed by the electric field?
Thursday, May 7, 2015 by M

Physics
Suppose two charged conducting wires each have current I, and they're placed parallel to each other. Fins the line charge density that needs to be placed on each wire so that the electric repulsion between them balances the magnetostatic force so that they are in equilibrium.
Thursday, May 7, 2015 by M

Physics
Suppose a 7kg bob is hanging from the ceiling in a region with uniform electric field E= 46x + 29y N/C. Find the charge on the bob if it's angular position is displaced from the vertical by 20 degrees.
Thursday, May 7, 2015 by M

physics
Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 521 nm, determine the number of photons per second per square meter that reach the earth.
Wednesday, May 6, 2015 by selu

Physics
In an AC circuit with a frequency 25 Hz producing an rms voltage of 30 V and a 20 farad capacitor, what is the end current?
Wednesday, May 6, 2015 by M

Physics
In an ac circuit with frequency 25 Hz producing an rms voltage of 30 V and a 30 Henry inductor, what is the rms current going through the inductor?
Wednesday, May 6, 2015 by M

physics
A rain cloud contains 3.56 x 107 kg of water vapor. How long would it take (in seconds) for a 4.5 kW pump to raise the same amount of water to the cloud which has an altitude of 1741.4 meters?
Wednesday, May 6, 2015 by raeg

Physics
A weather balloon is released at an altitude of 500m. The force of gravity on the balloon is 21.1n. The lift force provided by the atmosphere is 18.7n. Which of the following is true about the balloon? a. The balloon rises at constant velocity. b. the net force on the balloon...
Wednesday, May 6, 2015 by Katie

Physics
A sled mass of 40 kg is pulled along a snow covered surface. The coefficient of static friction is 0.40 and the coefficient of sliding friction is 0.25 a) what force is needed to start the sled moving? b)what force is needed to start to keep the sled moving at a constant speed...
Wednesday, May 6, 2015 by Sarah

Physics
A sled mass of 40 kg is pulled along a snow covered surface. The coefficient of static friction is 0.40 and the coefficient of sliding friction is 0.25 a) what force is needed to start the sled moving? b)what force is needed to start to keep the sled moving at a constant speed...
Wednesday, May 6, 2015 by Sarah

physics
water is flowing at 3 m/s in a horizontal pipe under a pressure of 200 kpa. the pipe, which narrows to half its original diameter, is laid out on a level ground? a) what is the speed of flow in the narrow section? b) what is the pressure in the narrow section? c)how do the ...
Wednesday, May 6, 2015 by Arnel Comia

Physics
we have an unknown mass of water at an initial temp of 35 degrees C and 100 g ice cube at -5 degrees, the final temp is 5 degrees. What is the mass of the water? Specific heat of ice is 2100 j/(kg*k) latent heat of fusion of ice is 333.7 kj/kg
Tuesday, May 5, 2015 by Amber

Physics
Not sure what formula to use.. im given the molar mass of a molecule the temperature it's at and the distance it traveled, and im looking for the time it takes to travel that distance
Tuesday, May 5, 2015 by Amber

physics
Consider three charges arranged in a triangle as shown. + - + 0.266 m 0.599 m −3.4 nC 8.1 nC 4.8 nC y x What is the net electric force on the charge at the origin? The value of the Coulomb constant is 8.99 × 109 N · m2 /C 2 . Answer in units of N. 010 (part ...
Tuesday, May 5, 2015 by jamie

physics
4. Three point charges, +6.3 µC, +2.3 µC, and −3.4 µC, lie along the x-axis at 0 cm, 2.6 cm, and 5.2 cm, respectively. What is the force exerted on q1 by the other two charges? (To the right is positive.) The Coulomb constant is 8.99 × 109 N &...
Tuesday, May 5, 2015 by jamie

Physics
A paperboy moves at 3 m/s delivering newspaper. He throws a newspaper directly behind himself at 3 m/s, in the frame of reference of someone standing nearby, what is the motion of the newspaper?
Tuesday, May 5, 2015 by TRW

Physics
A rowboat is moving at 3 km/hr straight across a river from north to south and the river is flowing east at 4 km/hr. What is the resultant velocity?
Tuesday, May 5, 2015 by TRW

Physics
Test Bank, Question 13 In a classroom demonstration, a 79.2-kg physics professor lies on a "bed of nails." The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. ...
Tuesday, May 5, 2015 by Seham

Physics
A stone is thrown vertically upward with a speed of 12.0 m/s. (a) How fast is it moving when it reaches a height of 5.0 m? (b) How long is required to reach this height?
Tuesday, May 5, 2015 by Shing

physics
A spring has an unstretched length of 20 cm. A 100 g mass hanging from the spring stretches it to an equilateral length of 30 cm. suppose the mass is pulled down to where the spring's length is 40 cm. When it is released, it begins to oscillate. What is the amplitude of ...
Monday, May 4, 2015 by Marie Barrientos

Physics
The standard sampling rate (in Hz) used for sampling speech signals in telephony systems is 8 kHz with 8 bits assigned per sample. Based on this fact, calculate how much time it would take to transmit one second of raw digitized speech over a transmission line that has the ...
Monday, May 4, 2015 by Sabrina

physics
Find the total change in the internal energy of a gas that is subjected to the following two-step process. In the first step the gas is made to go through isochoric heating until it gains 5963 J and its pressure is 3.12 105 Pa. In the second step it is subjected to isobaric ...
Monday, May 4, 2015 by Anonymous

physics
The length of a moving spaceship is 27.0 m according to an astronaut on the spaceship. If the spaceship is contracted by 14.5 cm according to an Earth observer, what is the speed of the spaceship? I know L=27m and delta L= 0.145 so our contracted length is 26.855 so what ...
Monday, May 4, 2015 by Robby

Physics
a 4.0 cm high object is placed 5.10 cm from a concave mirror whose redius of curvature is 21.2 cm. Find the inmage distance and the image size.
Monday, May 4, 2015 by Jacbo

PHYSICS PLEASE HELP
When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume that the star is a...
Monday, May 4, 2015 by KS

Physics
A horizontal overhead power line carries a current of 500A in west to east direction. What is the magnetic field 1.5m below? What is it's direction?
Monday, May 4, 2015 by Shifa

Physics
A 24V lamp has a resistance of 8.0 ohms. What resistance must be placed in series with the lamp if it is to be used in a 117V line? I think I understand how resistors work but this HW question is completely over my head..
Monday, May 4, 2015 by John Q

physics
A fixed mass of gas has a pressure of 8700 Pa, a volume of 10.5 m3 and temperature of 68 °C. The pressure and volume of the gas are changed to 9 243 Pa and 14.4 m3. The new temperature of the gas is
Monday, May 4, 2015 by danny

PHYSICS
Please help me, I don't understand how to solve this: When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple...
Monday, May 4, 2015 by Anonymous

Physics
Given an object distance of 48[mm] and a thin-lens focal length of 110[mm], then what is the image distance? What is the scale factor (M) of the image seen in the previous question?
Sunday, May 3, 2015 by Bri

physics
A cube has a density of 2200kg/m3 while at rest in the laboratory. What is the cube's density as measured by an experimenter in the laboratory as the cube moves through the laboratory at 81.0{\rm \\%} of the speed of light in a direction perpendicular to one of its faces?
Sunday, May 3, 2015 by Anonymous

Physics
Prove that if an object is at a distance of twice the focal length from a lens the image is the same size as the object. Show this using an algabraic method.
Sunday, May 3, 2015 by Anonymous

physics
Bill has a mass of 66.9 kg. Jane has a mass of 58.8 kg. If they are seated 2.2 m apart, how much gravitational force attracts them?
Sunday, May 3, 2015 by liz

PHYSICS
When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume that the star is a...
Sunday, May 3, 2015 by Anonymous

physics
vibrating a long spring with a succession of pulses with a frequency of 50Hz produces adjacent nodes that are separated by 3.5cm. what is the velocity of the longitudinal waves formed?
Sunday, May 3, 2015 by Anonymous

Physics
Consider two students, a 65 kg guy and a 50 kg girl who are attracted to each other, gravitationally, that is. They sit next to each other in Physics class which means there is 1.5m between their centers. What is the magnitude of the force of gravity between these two students...
Sunday, May 3, 2015 by Maria

Physics Help Please
A 35-mm camera equipped with a 40-mm focal length lens is used to photograph a tree 17 m tall. If a 32-mm high image of the tree on the CCD sensor is required, how far should the camera lens be from the tree? Show Work Please! Thank you so much!
Sunday, May 3, 2015 by Need Help Urgent

physics
Francesca, who likes physics experiments, dangles her watch from a thin piece of string while the jetliner she is in takes off from JFK Airport. She notices that the string makes an angle of 25° with respect to the vertical as the aircraft accelerates for takeoff, which ...
Sunday, May 3, 2015 by Scar

physics
a box is given a push so that it slides across the floor. how far will it go, given that the coefficient of kinetic friction is 0.2 and the push imparts an initial speed of 4m/s?
Sunday, May 3, 2015 by Scar

physics
a box is given a push so that it slides across the floor. how far will it go, given that the coefficient of kinetic friction is 0 .2 and the push imparts an initial speed of 4m/s?
Sunday, May 3, 2015 by Scar

PHYSICS
When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume that the star is a...
Saturday, May 2, 2015 by Anonymous

PHYSICS
A uniform board is leaning against a smooth vertical wall. The board is at an angle above the horizontal ground. The coefficient of static friction between the ground and the lower end of the board is 0.750. Find the smallest value for the angle , such that the lower end of ...
Saturday, May 2, 2015 by Anonymous

PHYSICS
A hiker, who weighs 977 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 4500 N, and rests on two concrete supports, one on each end. He stops 1/6 of the way along the bridge. What is the magnitude of the force that a ...
Saturday, May 2, 2015 by Anonymous

PHYSICS
The figure shows a jet engine suspended beneath the wing of an airplane. The weight of the engine is 14600 N and acts as shown in the figure. In flight the engine produces a thrust of 55100 N that is parallel to the ground. The rotational axis in the figure is perpendicular to...
Saturday, May 2, 2015 by Anonymous

Physics Helpppp
Q11 a(ii)A sinusoidal carrier wave has frequency 500 kHz and amplitude 6.0 V. It is to be frequency modulated by a sinusoidal wave of frequency 8 kHz and amplitude 1.5 V. The frequency deviation of the carrier wave is 20 kHz V^–1 Describe, for the carrier wave, the ...
Saturday, May 2, 2015 by Ariana

Physics Help Please
Scientists at Oak Ridge National Laboratory confirmed the existence of element 104 by creating 3000 atoms of it. If radioactive decay caused the number of atoms to drop by half within 4.0 s, how many atoms were left after 12 s? Show work please! Thank you!
Saturday, May 2, 2015 by Kim

physics
A hydraulic jack is used to lift a 2600 pound car. If the output piston (the one the car is sitting on) has an area of 60 square inches, how much force must be applied to the 0.5 square inch input piston to lift the car? ______ pounds.
Saturday, May 2, 2015 by Amy

Physics Help Please
A 35-mm camera equipped with a 40-mm focal length lens is used to photograph a tree 17 m tall. If a 32-mm high image of the tree on the CCD sensor is required, how far should the camera lens be from the tree? Show Work Please! Thank you so much!
Saturday, May 2, 2015 by Need Help Urgent

Physics Help Please --- Telescope
An astronomical refracting telescope is made from two lenses. the objective lens has a focal length of 114 cm, and the eyepiece lens has a focal length of 17 cm. a) What is the total length of the telescope? b) What is the angular magnification of the telescope? c) What is the...
Saturday, May 2, 2015 by Tanya

physics
suppose you want to know the amount of heat heat needed to raise the temperature of 2kg of copper by 10 degrees.what property of copper do yiu need to know?
Saturday, May 2, 2015 by fredericks

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