Select an area of the website to search
Physics
All
Study Guides
Homework Help
Lesson Plans
Search this site
Go
Page Citation
Start an essay
icon-question
Ask a question
Join
Sign in
Study Guides
Homework Help
Teacher Resources
Start free trial
Sign In
Start an essay
Ask a question
Physics
Start Free Trial
Questions & Answers
Start Free Trial
Physics Questions and Answers
Why is a parallel circuit arrangement best for house wiring?
I need urgent physics help. My teacher didn't explain this well. Please help with as many as u wish but if i can just get help with one at least i can figure out how to do the rest. 1. An Olympic long jumper leaves the ground at an angle of 23 degrees and travels through the air for a horizontal distance of 8.7m before landing. What is the takeoff speed of the jumper? 2. A driver springs upward from a board that is three meters above the water, A the instant she contacts the water ger speed is 8.90 m/s and her body makes an angle of 75.0degrees with respect to the horizontsl surface of the water. Dtermine her initial velocity, noth madnitude and direction. 3. A soccer player kicks the ball toward a goal that is 16.8m in front of him. The ball leaves his foot at a speed of 16.0m/s and at an angle of 28 degrees above the ground. Find the speed of the ball when the goalie catches it in fornt of the net. 4. The Javelin is launched at a speed of 29m/s at an angle of 36 degrees above the horizontal. A it travels upward, its velocity points aboce teh horizontal at an angle that decreases as time pases. how much time is required for the angle to be reduced from 36 degrees at launch to 18 degrees?
How are impulse and momentum applied in an egg drop challenge? The challenge was to construct something protective out of 3 sheets of newspaper, tape, and 4 straws so the egg wouldn't break after a fall.
A boulder with mass 2500 kg falls from a ledge 200 m above the ground. If mechanical energy is conserved what is the speed of the boulder just before it hits the ground?
In the context of conservation of energy what effect does friction have on kinetic energy and gravitational potential energy?
What is the force exerted on the ball in the following scenario? A child bounces a 54 g superball on the side-walk. The velocity change of the superball is from 23 m/s downward to 19 m/s upward.If the contact time with the sidewalk is 1/800 s, what is the magnitude of the average force exerted on the superball by the sidewalk?
A 100 N box falls from a truck moving at 25 m/s and slides to a stop in 55 m. What is the coefficient of friction between the box and the highway. How much work was done on the box by the friction?
Why do heavier things fall faster than lighter things if dropped from a certain height ?
What are the relationships between gravitational potential energy vs. position, kinetic energy vs. position, and total mechanical energy vs. position?
At sea level, what is the approximate value of atmospheric pressure in Pa, in mmHg and in atm? (where g = 10 N/kg)
What is the illuminance (in lm/m^2) on a desktop if the lamp is 0.9 m above it? The equation of the illuminance, E, of a small light source is E = P/ 4(pie)d^2, where P is the luminous flux (in lumens, lm) of the source and d is its distance from the surface. Suppose the luminous flux of a desk lamp is 1200 lm. Name the values of d if any that are not in the domain of the given function.
A 1800 kg car increases in velocity from 25m/s to 30m/s. How much work was done on the car to increase it to its final velocity.
A projectile is fired at an angle of 45 degrees to the horizontal. If its initial velocity is 90 m/s, how far does the projectile travel? (Assume g = 10m/s^2.)
PHYSICS help If a metal wire has its length doubled and its diameter tripled, by what factor does its Young's modulus change?
Are astronauts really weightless?
A girl starts from rest and reaches a walking speed of 1.4 m/s in 3.0 s. She walks at this speed for 6.0 s. The girl then slows down and comes to a stop in 10 s. What was the girl’s acceleration during each of the three time periods? What was her acceleration for the entire trip?
What actually distinguishes the future from the past, if the universe is governed by physical laws?
How Photoelectric effect is a proof of energy quantification?
Describe the experiment which describes Boyle's law.
A rock is hanging downwards from the top of a bus accelerating at 16 m/s^2. What is the angle of the string made with the vertical?
A pilot flying horizontally 300 m above the ground at 300 km/h wishes to drop a package on a platform moving at 30 km/h in the same direction. How many seconds before he is directly above the platform must he release the package and what must be the distance measured in the horizontal direction separating the plane and the platform?
A ball is projected horizontally with speed v m/s at a height of 5 m above the ground. When the ball has travelled a horizontal distance of 15 metres, it hits the ground. What is the time taken by the ball to hit the ground and what is v.
How are man made elements, such as UUS created?
What is the potential energy of a crate of 500N at the edge of a ramp 5 m long inclined at 20 degree to the horizontal?
A person weighing 560 N is on a spring and rising in a rocket at 4g. If the spring is compressed by .06 m what is the spring constant.
Can there be such a thing as a black hole cluster, with multiple black holes in very very small distances?
A rocket is fired at 60 m/s at an angle 32 degrees to the horizontal. When is the magnitude of its velocity the least?
Explain the energy loss in the system below, considering heat, sound, and deformation.Determining the efficiency of energy conversion from Potential to Kinetic in a bouncy ball.The system/method used -1. Weigh accurately the test ball (power, tennis, multicoloured tennis, plastic, and sponge) and record its mass.2. Drop the ball vertically from a height of 3m (h1) determined by the measuring tape.3. Watch the ball bounce back and measure the height it reaches (h2).4. Record the height (h2).5. Perform a rough run and three proper runs. Average the proper runs and record your result.6. Repeat steps 1 to 5 using the remaining types of balls.'Explain' the energy loss in the system above (please, use heat energy, sound energy, and deformation in your answer)?THANK YOU!
What is a convex lens?
A doorbell requires a current of 0.4 A and 6 volts. It is connected to a transformer with 2000 turns in the primary coil, which is plugged into a 120 Vac voltage source. Find the number of turns necessary in the secondary coil, and the current in the primary coil. Assume 100% efficiency.
A block of mass 3.73 kg is pushed 2.68m along a frictionless horizontal table by a constant 16 N force directed 24 degrees below the horizontal. What is the work done by: the applied force, the normal force exerted by the table, the force of gravity and the work done by the net force on theblock.
At what speed v will the mass of an object be 10% greater than its rest mass?
What is the weight of the statue of liberty in the following cases: 1. Calculate the weight of the Statue of Liberty (205 tons) on Earth. The Earth has a mass of 6 * 10^24 kg and a radius of 6.4 × 10^6 m. 2. What would this weight be on Mars, with mass 0.11 times that of Earth and radius 0.53 times that of Earth? The value of the universal gravitational constant is 6.67*10^-11 N*m^2/kg^2.
What is the period of moon B?Moon A is 1 J.D. from Jupiter and goes around in 1 day. Moon B is 5.1 J.D. from Jupiter. What is the period of Moon B? [0.00 decimal places]
A 2.2 kilo ohm resistor in a stereo system dissipates 42mW of power. What is the voltage across the resistor?
A roller coaster on the top of a hill rolls to the top of a lower hill. If mechanical energy is conserved, on which hill is the kinetic energy larger?
Can a body have a velocity equal to zero but non-zero acceleration?
What is John's resultant displacement from 234 mile marker? answer in units of km. While John is traveling along a straight interstate highway, he notices that the mile marker says 234 km. John travels until he reaches the 134 mile marker and then retraces his path to the 180 km marker.
If a person in the elevator were standing on a bathroom scale calibrated in newtons, what would the scale read while the elevator was (a) descending at constant speed and (b) while slowing to a stop? Please explain your answers.
A 70 kg cart is pushed for 50 m with a constant velocity upon a 45º frictionless incline. What is the work done on the cart?
A man pulls a block of 60 kg with a string that has a tension 25 N. If the strings forms an angle of 30 degrees... with the horizontal, what is the work done in pulling the block 30m.
What is the difference between solar (photo)thermal and photovoltaic solar energy conversion?
The energy in a bicycle is 6000 J at the top of a hill. The brakes are applied and its potential energy at the bottom of the hill is 2000 J. How much thermal energy was produced?
A ball is thrown vertically upwards with a velocity 'u'. Calculate the velocity with which it falls back to the Earth again.
Child sitting in a tree throws his apple from the height of 4.0 m with a velocity of 5.0 m/s [35 degrees above horizontal]. It hits the ground right next to his friend. How long is it before the apple core hits the ground?
A Honda moving at 100 km/hr is 80km behind a Ford in the same direction at 60 km/hr how far does the Honda travel before it catches up with the Ford?
At what rate does heat have to be removed in the following case: A cold storage has 1500 kg of water at 20 degree Celsius that has to be converted to ice at 0 degree Celsius. The ice has to be created within half an hour.
A wave generator set at 45 Hz produces a 30 mm wavelength that propagates across a shallow tank of water 80 cm in length. How long does it take for the waves to cross the tank?
A baseball moving at 20 m/s is struck by a bat and moves in the opposite direction at 30 m/s. if the impact lasted for 0.010 s, what was the baseball's acceleration?
A common hydromenter with astem of 10cm long and volume one-tenth of whole hydrometer, floats with 2cm of stem above the water surface. What is the density of the liquid in which the hydrometer floats with 4cm abave the surface?