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December 22, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
Larry leaves home at 9:03 and runs at constant speed to the lamppost(200 yards from the start). He reaches the lamppost at 9:07, immediately turns, and runs to the tree(1200 yards from the start). Larry arrives at the tree at 9:13. What is Larry’s average velocity, in ...
Wednesday, August 27, 2014 at 3:00am

physics
the diameter of the moon is 3480 km. A.)what is the surface area of the moon? B.)how many times larger is the surface area of earth?
Wednesday, August 27, 2014 at 12:07am

Physics
Determine the magnitude of the vector sum V=V1+V2 and the angle theta(x) which V makes counterclockwise from the positive x-axis. V1 = 34 units and makes a 20 degree angle with the +x axis V2 = 28 units and forms a 3,4,5 triangle with the -x axis
Tuesday, August 26, 2014 at 10:29pm

physics
Vector has a magnitude of 136 units and points 35.0 ° north of west. Vector points 69.0 ° east of north. Vector points 19.0 ° west of south. These three vectors add to give a resultant vector that is zero. Using components, find the magnitudes of (a) vector and (b...
Tuesday, August 26, 2014 at 5:27pm

physics
You measure the mass of a 500 g standard on your balance four times. You get values of 455 g, 456 g, 454 g, and 455 g. Which of the following best describes your balance?
Tuesday, August 26, 2014 at 2:03pm

Physics
If a car is accelerating, is the car's velocity constant. Please sentence explanation.
Tuesday, August 26, 2014 at 1:10pm

Physics
If toy rocket rises vertically and then falls back to the ground, what changes occur in the rocket's velocity and acceleration. Please give a sentence explanation not a formula
Tuesday, August 26, 2014 at 12:37pm

physics
What's the net force acting on an 18-kg object if an acceleration of 3.0 m/s2 is produced? A. 54 N B. 12 N C. 6 N D. 36 N
Tuesday, August 26, 2014 at 12:37pm

Physics
The statically-indeterminate composite beam AB of length 2L is fixed at A (x=0) and is simply supported at B (x=2L). The beam is composed of a core of modulus E0 of constant square cross section of dimensions 2h0×2h0 bonded inside a sleeve of modulus 2E0 and constant ...
Tuesday, August 26, 2014 at 7:17am

physics
A person whose eyes are 2.87 m above the floor stands 2.11 m in front of a vertical plane mirror whose bottom edge is 41 cm above the floor. What is the horizontal distance x to the base of the wall supporting the mirror of the nearest point on the floor that can be seen ...
Tuesday, August 26, 2014 at 5:12am

physics
A CRICKET BALL OF MASS 0.4kg MOVING WITH A VELOCITY OF 72km/h IS BROUGHT TO REST BY A PLAYER . WHAT IS THE MAGNITUDE OF THE AVERAGE FORCE EXERTED BY THE PLAYER?
Monday, August 25, 2014 at 11:53pm

Physics
David, who is 65 kg, is driving his car at a speed of 25 m/s. He sees a dog crossing the road and so he steps on the brake to avoid hitting it. His seatbelt brings his body to a stop in 0.4 s. What magnitude of force does the seatbelt exert on him?
Monday, August 25, 2014 at 10:21pm

Physics
02. Comic-strip hero Superman meets an asteroid in outer space and hurls it at 800 m/s, as fast as a bullet. The asteroid is a thousand times more massive than Superman, yet in the comic strip, he remains stationary after releasing the asteroid. Say, his mass is 107 kg, what ...
Monday, August 25, 2014 at 10:20pm

Physics
wo objects each have a positive charge. The total charge on both objects is 365 µC. When the objects are placed a distance of 1.30 m apart, each exerts an electrostatic force of 24.3 N on the other. What is the charge on each object? (Give your answers in µC.)
Monday, August 25, 2014 at 9:30pm

Physics
Two boys are pulling a box across a horizontal floor as shown in the figure below. vector F 1 = 50.0 N and vector F 2 = 100 N. (a) Find the resultant (or sum) force by the graphical method. (b) Find the resultant (or sum) force by the component method.
Monday, August 25, 2014 at 8:31pm

Physics
Given an angle of 30 degrees, find the minimum initial speed of a cannon ball that travels in a horizontal distance of 15000 mi.
Monday, August 25, 2014 at 2:20pm

Physics
A ball thrown by a boy in the street is caught 5 s later by another boy on the balcony of the house 10 m away and 3 m above the street level. What is the initial speed of the ball? What is the angle above the horizontal at which it was thrown?
Monday, August 25, 2014 at 2:18pm

Physics
The statically-indeterminate composite beam AB of length 2L is fixed at A (x=0) and is simply supported at B (x=2L). The beam is composed of a core of modulus E0 of constant square cross section of dimensions 2h0×2h0 bonded inside a sleeve of modulus 2E0 and constant ...
Monday, August 25, 2014 at 1:17pm

Basic Physics
Determine the minimum gauge pressure needed in the water pipe leading into a building if water is to come out of a faucet on the twelfth floor, 41m above that pipe.
Monday, August 25, 2014 at 1:16pm

Physics
What is the difference in blood pressure (mm−Hg) between the top of the head and bottom of the feet of a 1.88m tall person standing vertically?
Monday, August 25, 2014 at 1:13pm

Physics (density)
A boat made of wood (each piece 5cm in width) begins to sink. To Save yourself you grab a block made of the wood. Determine the area of it, making sure it will hold at least 100kg of weight without sinking.
Monday, August 25, 2014 at 1:12pm

Physics
How is the Sky Screamer at Six Flags an example of Newton's First Law?
Monday, August 25, 2014 at 12:44pm

Physics
CONICAL SHAFT WITH DISTRIBUTED TORSIONAL LOAD The conical shaft AB is made of steel, with shear modulus G0. The shaft has length L and is free at A (where x=0) and fixed at B (where x=L). The shaft is solid, with a linear taper so that the radius of the generic (circular) ...
Monday, August 25, 2014 at 11:47am

physics
Some of the branches of physics that you will study in this course investigate motion, the properties of materials, sound, light, electricity and magnetism, properties of atoms, and nuclear reactions. Give at least one example of an application of each branch.
Monday, August 25, 2014 at 7:45am

physics
question: your propessor enters a dogsled race during the winter break to get started she pulls the sled (total mass 80kg) with a force of 180N at 20degrees the sled moves 5m along horizontal. find the work she does find the final speed of the sled after it moves change in x=...
Monday, August 25, 2014 at 7:40am

physics
an electron in a one-dimensional box undergoes a transition from the n=3 level to the n=6 level by absorbing a photon of wave length 500 nm. what is the width of the box?
Monday, August 25, 2014 at 1:55am

physics
Some of the branches of physics that you will study in this course investigate motion, the properties of materials, sound, light, electricity and magnetism, properties of atoms, and nuclear reactions. Give at least one example of an application of each branch.
Monday, August 25, 2014 at 1:36am

Honors Physics
Give some examples of applications that resulted from work done by physicists. The answers I have are: computers, electricity, cars, and television. Are these acceptable?
Sunday, August 24, 2014 at 11:05pm

Honors Physics
Give some examples of applications that have resulted from work done by physicists on the exploration of space.
Sunday, August 24, 2014 at 10:59pm

Honors Physics
Give some examples of applications that resulted from work done by physicists. The answers I have are: computers, electricity, cars, and television. Are these acceptable?
Sunday, August 24, 2014 at 10:43pm

physics
A ship at sea is due into a port 600 km due south in two days. However, a severe storm comes in and blows it 200 km due east from its original position. How far is the ship from its destination?
Sunday, August 24, 2014 at 5:41pm

physics
You are at a archeological dig an discover a strange artifact. It is a utinsil tha appears to be carved out of an elephant's tusk You analyze it and discover that it has 0.625 the amount of carbon -14 you woul find in a living specimen. How many half lives has the specimen...
Sunday, August 24, 2014 at 4:33pm

Physics
A body travels from rest with acceleration 8m/s(squared)Find its velocity when it has covered a distance of 100 meter?
Sunday, August 24, 2014 at 4:20pm

physics
Write down the unit in which reaction rate is measured in this observation? Equation is Zn(s)+I~ZnI
Sunday, August 24, 2014 at 1:41pm

Physics
At what distance from the earth's surface will a mass of 40.0 kg be just 385.0 in weight?
Sunday, August 24, 2014 at 10:10am

physics
a gun fires Aa bullet of mass 50g the bullet moving with a velocity of 100m/s strikes a sandbag get embedded after travelling 10cm calculate the resistance force exerted by the sand bag on the bulle
Sunday, August 24, 2014 at 9:55am

physics
boy weighting 30 kg is riding a bicycle weighting 50 kilograms if the bycycle is moving at a speed of 90 kilometres per hour towards the west find the linear momentum of the bycycle boy system in s i units
Sunday, August 24, 2014 at 9:44am

physics
considering 3 identical balls. ball 1 with initial speed V collides elastically with balls 2 & 3 whose centres are on a line perpendicular to the initial velocity of ball 1 and ball 2 & 3 are in contact with each other. ball 1 is aimed directly at the contact point and all ...
Sunday, August 24, 2014 at 6:46am

Physics
What is the gravitational force between a proton and an electron in a hydrogen atom if they are separated by a distance of 5.29x10^-9 cm
Sunday, August 24, 2014 at 6:44am

Physics
Charge A has a charge of +2 C. Charge B has a charge of - 3 C and is located 1 meter to the right of A. Charge C is located 1 m to the right of charge Band has a charge of -1C. If a fourth charge (Charge D) is placed 4 m to the right of Charge B, How much charge must it ...
Saturday, August 23, 2014 at 7:28pm

physics
Draw energy graph of the reaction where energy reaction is 1kg mol-1 the energy of the product is 50kg mol-1 and the activation is 50kg mol-1.state whether reaction is exothermic o endothermic
Saturday, August 23, 2014 at 1:00pm

physics
a ball A collides elastically with another ball B initially at rest. A is moving with a velocity of 10m/s at an angle 60' from the line joining the center. select the correct alternative: a)velocity of ball A after collision is 5 m/s b)velocity of ball B after collision is...
Saturday, August 23, 2014 at 10:04am

physics
Q1-In hugyen's principle of wave theory why the waves are move in forward direction not in backward direction means they move forward as a new source why not in backward direction? Ans- I think that waves move in forward direction sir i know that only so please give me a ...
Saturday, August 23, 2014 at 9:12am

physics
a balloon starts rising from the ground, vertically upwards, uniformaly at a rate of 1m/s. At the end of 4 seconds a body was released from the balloon. Calculate the time taken by the realeased body to reach the ground. Take g=10m/s^2
Saturday, August 23, 2014 at 7:41am

PHYSICS
A 20 kg wagon is pulled along the level ground by a rope inclined at 30 deg above horizontal. A frictional force of 30 N opposes the motion, how large is the pulling force if the wagon is moving at constant velocity.
Saturday, August 23, 2014 at 3:16am

Physics
What is the gravitational force between a proton and an electron in a hydrogen atom if they are separated by distance of 5.29x10^-9 cm.
Saturday, August 23, 2014 at 3:09am

Physics
Whats the difference between frictionless and friction in a way of solving? Like in formula, and what formula should use
Friday, August 22, 2014 at 9:58pm

Physics
1.)A force of 250 is just sufficient to start a 50 kg steel trunk moving across a wooden floor. Find the coefficient of static friction. 2.) compute the acceleration of the block sliding down a 30 deg inclined plane if the coefficient of kinetic friction is 0.20.
Friday, August 22, 2014 at 9:38pm

Physics
A 20 kg wagon is pulled along the level ground by a rope inclined at 30 deg above horizontal. A frictional force of 30 N opposes the motion, how large is the pulling force if the wagon is moving at constant velocity?
Friday, August 22, 2014 at 9:17pm

Physics
A body A of a mass 0.16 kg exerts a force of 6.2x10^-10 N on a body B when the distance between their centers is 0.37 meters. What is the mass of body B?
Friday, August 22, 2014 at 9:15pm

Physics
The speed of an arrow fired from a compound bow is about 57 m/s. An archer sits astride his horse and launches an arrow into the air, elevating the bow at an angle of 54 above the horizontal and 2.3 m above the ground. What is the arrow's range?
Friday, August 22, 2014 at 8:33pm

physics
A car of mass 1000 kg accelerates uniformly from rest to a velocity of 54 km/h in 5 seconds calculate 1) its acceleration 2) its gain in k.e 3) average power of the engine during this period . neglect friction
Friday, August 22, 2014 at 3:50pm

physics
A car of mass 1000 kg accelerates uniformly from rest to a velocity of 54 km/h in 5 seconds calculate 1) its acceleration 2) its gain in k.e 3) average power of the engine during this period . neglect friction
Friday, August 22, 2014 at 3:48pm

physics
Find the ratio of the electrostatic to gravitational force between two electrons. 4.16×1042 What is this ratio for two protons? (Why is the ratio different for electrons and protons?)
Friday, August 22, 2014 at 12:48pm

Physics
The figure below shows an electron passing between two charged metal plates that create an 115 N/C vertical electric field perpendicular to the electron’s original horizontal velocity. (These can be used to change the electron’s direction, such as in an oscilloscope...
Friday, August 22, 2014 at 12:33pm

Physics
1.) The earth's radius is about 3956.52 mi. An object that has a mass of 20 kg is taken to a height of 160 km above the earth's surface. a. What is the mass of the object at this height? b. How much does the object weigh at this height?
Friday, August 22, 2014 at 10:48am

Physics
A 25 kg box is along a horizontal floor and a force of 400 N pushes the box with an angle of 50 deg with the horizontal. Starting from rest, the box achieves a velocity of 2 m/s in a time of 4 seconds. Find the coefficient of sliding friction between box and the floor.
Friday, August 22, 2014 at 10:43am

Physics
A 20 kg wagon is pulled along the level ground by a rope inclined at 30 deg above horizontal. A frictional force of 30 N opposes the motion, how large is the pulling force if the wagon is moving at constant velocity?
Friday, August 22, 2014 at 8:27am

Physics
A body A of a mass 0.16 kg exerts a force of 6.2x10^-10 N on a body B when the distance between their centers is 0.37 meters. What is the mass of body B?
Friday, August 22, 2014 at 8:23am

physics
A motorist A leaves a small town and drives East at 28 ms-1 . A second motorist B is driving South towards the same town at 23 ms-1 . Draw a diagram and find the velocity of motorist B relative to motorist A? ( VB REL A ) is this just phythagoras and finding the resultant ...
Friday, August 22, 2014 at 4:35am

physics
Please help me answer the question because I am really confused about this problem. 1. an electron in a one-dimensional box undergoes a transition from the n=3 level to the n=6 level by absorbing a photon of wave length 500 nm. what is the width of the box? 2. what is the ...
Friday, August 22, 2014 at 4:14am

Physics
The wavelength of a stationary wave is 36.0cm. What is the distance between a node and the next anti -node
Friday, August 22, 2014 at 2:23am

physics
hill that has a 37.7 % grade is one that rises 37.7 m vertically for every 100.0 m of distance in the horizontal direction. At what angle is such a hill inclined above the horizontal?
Thursday, August 21, 2014 at 11:05pm

physics
A highway is to be built between two towns, one of which lies 47.0 km south and 69.0 km west of the other. (a) What is the shortest length of highway that can be built between the two towns, and (b) at what angle would this highway be directed, as a positive angle with respect...
Thursday, August 21, 2014 at 10:56pm

physics
A lighthouse that rises 49 ft above the surface of the water sits on a rocky cliff that extends 19 ft from its base. A sailor on the deck of a ship sights the top of the lighthouse at an angle of 30.0 ∘ above the horizontal. If the sailor's eye level is 14 ft above ...
Thursday, August 21, 2014 at 9:19pm

physics
The mass of a solid cube is 700 g, and each edge has a length of 6.42 cm. Find the density of the cube. Answer in units of kg. d=m/v d=700/(6.42^3) 700/264.60928
Thursday, August 21, 2014 at 8:34pm

Physics
The vector -5.2A⃗ has a magnitude of 40m and points in the positive x direction. Find the x component of the vector A⃗ ? I do not understand how I am supposed to figure this out with just having the magnitude of the vector. Shouldn't there be an angle or ...
Thursday, August 21, 2014 at 8:23pm

physics
from point A, a boy walks 4 m to the east,2 m to the sout, 4 m to the west , and finally, 2 m to the north , find the distance he travelled and his displacement
Thursday, August 21, 2014 at 11:32am

physics
show a car that travels 5 km due east and makes a u-turn to travel another 3 km find distance covered and its displacement
Thursday, August 21, 2014 at 11:27am

physics
(a) An object is subjected to two displacements. The displacement vector of the first, V1 , has a magnitude of 186 m at an angle 23° North of East. The second displacement vector, V2 , has a magnitude of 327 m at an angle 43° West of North. find the magnitude and ...
Thursday, August 21, 2014 at 12:26am

physics
(b) The current in a river flows at 1.51 ms-1 relative to the shore. A swimmer with a velocity of 3.76 ms-1 relative to the water wishes to swim directly across the river. At what angle to the shore should the swimmer head in order to arrive directly opposite on the other bank...
Thursday, August 21, 2014 at 12:08am

physics
(a) The current in a river flows at 1.35 ms-1 relative to an observer on the shore. A swimmer with a velocity of 3.12 ms-1 relative to the water swims directly upstream. What is the velocity of the swimmer relative to an observer on the shore? i used v=v water + v swimmer -1....
Thursday, August 21, 2014 at 12:01am

physics
Consider nitrogen gas, N2, at 27.7°C. What percentage of nitrogen molecules have a speed within 1.00 m/s of the most probable speed?
Wednesday, August 20, 2014 at 5:15pm

physics
Two uniform planks, each of mass m = 4.41 kg and length L = 2.11 m, are connected by a hinge at the top and by a chain of negligible mass attached at their centers, as shown in the figure. The assembly will stand upright, in the shape of an A, on a frictionless surface without...
Wednesday, August 20, 2014 at 2:50pm

physics
what is the average pressure and average thrust on walls of the tank of cubical dimension of each side 4 m filled with water upto the brim. given g = 10 m raised to -2 . Please help this is urgent
Wednesday, August 20, 2014 at 9:04am

physics
A square vessel of sides 0.2m x 0.1 m is filled with alchol od density 900 kg m raised to -3 upto a level of 0.5 m. what is the pressure and thrust on the bottom of vessel? Giving g = m s raised -2 .
Wednesday, August 20, 2014 at 8:51am

physics
1) write the formula to find the magnitude of gravitational force between earth and an object on earth's surface 2) how does the value of gravitational force 'f'change between two objects? 3) what is direction of an object moving with an acceleration due to gravity?
Wednesday, August 20, 2014 at 6:27am

physics
A coin is released inside a lift at a ht of 2m from the floor of the lift. The ht of the lift is 10 m . the lift is moving with an acceleration of 9m/s² downwards. The time after which the coin will strike with lift is: (g= 10 m/s)
Wednesday, August 20, 2014 at 2:35am

physics
Ratio of the ranges of the bullets fired from a gun(a constant muzzle speed) at angle x, 2x and 4x is found in the ratio x:2:2 then the values of x will be(assume same muzzle speed of bullets)
Wednesday, August 20, 2014 at 2:32am

physics
A partical p is projected from a point on the surface of long smooth inclined plane. Simultaneously another particle Q is released on the smooth inclined plane from the same position. P and Q collide after t=4 sec. The speed of projection of p is:
Wednesday, August 20, 2014 at 2:29am

physics
Liquids exert pressure at Right Angles to the surface of container.Please explain this with an example
Tuesday, August 19, 2014 at 11:24pm

Physics
NEED HELP On a flat battle ground, a catapult is used to launch a rock with a velocity of 25m/s at angle 30 degrees above the horizontal.? Sketch the situation and decompose the initial velocity vector. WHat are the initial values for Vx and Vy? Calculate the maximum height ...
Tuesday, August 19, 2014 at 10:34pm

physics/ basic of statics
Two forces 3kg & 5kg weight act at point making an angle 60° with each other find the magnitude & direction of the resultant
Tuesday, August 19, 2014 at 9:42pm

physics
A particle moves in a straight line with an acceleration a ms^-2 at time 't' seconds where a = - 1/t² when t=1 the particle has a velocity of 3ms^-1 then find the velocity when t=4
Tuesday, August 19, 2014 at 3:53pm

physics
A particle moves according to the eqn a=-kv where a is acceleration and v is the velocity and k is a constant. If initial speed is V0 find the speed at any instant
Tuesday, August 19, 2014 at 3:50pm

physics
An astronaut is on the surface of planet whose air resistance is negligible. To measure the acceleration due to gravity(g) he throws a stone upwards. He observe that the stone reaches the surface to a maximum ht of h =10m(which is negligible is compare radius of planet) and ...
Tuesday, August 19, 2014 at 3:47pm

physics
A train starts from station A at 1pm and reaches station B at 3 pm, aftet travelling 108 km. It halts at station B for one hour and then starts for station c which is 42 km fron station B. It reaches station c at 7pm on the same day. The avg speed fo the train for the whole ...
Tuesday, August 19, 2014 at 3:42pm

physics
For a particle undergoing rectilinear motion with uniform acceleration, the magnitude of displacement is one third the distance covered in some time interval. The magnitude of final velocity is less than magnitude of initial velocity for this time interval. Then the ratio of ...
Tuesday, August 19, 2014 at 3:38pm

Science
Justin wants to be the captain of an aircraft carrier when he gets out of school. Which subjects should Justin study to help him prepare for his career? A.biomedical science and meteorology B.oceanography and paleontology C.chemistry and biology D.physics and computer science ...
Tuesday, August 19, 2014 at 2:08pm

Science
Which branches of science do pharmacists need knowledge of to do their job properly? A.physics and chemistry B.biology and chemistry C.chemistry and geology D.physics and computer science Is the answer B?
Tuesday, August 19, 2014 at 1:59pm

Physics
A 50 kg box rests on a smooth frictionless table. Connected to the box is a light string passing through a pulley at the end of the table. Suspended on rhe other end of the string is a 20 kg box. Find a) acceleration of the system, b) the tension in the string c) the ...
Tuesday, August 19, 2014 at 12:19pm

Physics
A 3000 lb car has an initial velocity of 10 mi/h. How much force is required to accelerate the car to a speed of 50 mi/h in 10 seconds?
Tuesday, August 19, 2014 at 9:47am

Physics
A box sliding down a frictionless plane inclined at an angle 35 degrees with the horizontal. What is the acceleration of the box?
Tuesday, August 19, 2014 at 9:44am

physics
a car travelling at constant velocity passes a stationary motorcycle at a traffic light as the car overtakes the motorcycle,the motorcycle accelerates uniformly from rest for 10 sec the following displacement time graph represents the motion of both vehicles from the traffic ...
Tuesday, August 19, 2014 at 6:16am

Physics
Your younger brother who wishes to be a pilot reads a news article about a search and rescue plane. In this search and rescue operation, an ultra-light aircraft travelling north at 30 km/hr encounters a 40 km/hr crosswind. After explaining to him that a crosswind is wind that ...
Tuesday, August 19, 2014 at 5:48am

Physics
When the two 10 km/hr bikes (in the drawing below) are 20 km apart, a bee begins flying from one wheel to the other at a steady speed of 30 km/hr. When it gets to the wheel it abruptly turns around and flies back to touch the first wheel, then turns around and keeps repeating ...
Tuesday, August 19, 2014 at 5:48am

physics
A ball is thrown vertically upward from the ground with an initial velocity of sixty four feet per second. if the positive direction is up to 't' seconds is the time the has elapse since the ball was thrown and 's' is the distance of the ball from the starting ...
Tuesday, August 19, 2014 at 2:22am

Science
What is the formula used for finding the gravitational pull of a particular mass in physics?
Monday, August 18, 2014 at 10:55pm

physics
A tray held horizontally by a waiter. The tray has a weight of 6N and supports a drink of weight 3N. The waiter provides a force at P (BTW P is at one end). The tray my pivot about point T (BTW T is 5cm away from P) Find the force provided by the waiter at P and the upward ...
Monday, August 18, 2014 at 10:27pm

physics
a particle is projected at an angle of 30 degree to the horizontal. (a), calculate the time of flight of the particle. (b) speed of the particle at its maximum height
Monday, August 18, 2014 at 4:09pm

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