April 2013
2 posts
Anonymous asked: hi
March 2013
9 posts
Anonymous asked: Hi physics tutori! How are the energy levels of Be 3+ related to netural hydrogen? Estimate values if possible. Thanks!
karaksindru asked: Assume a speedster superhero traveling at or above 350 km/h, massing 88 kg, impacts an average adult human male who is standing still. How many bones are broken, and does the average adult human male survive the impact? (Assume the speedster has mystical forces keeping him safe.)
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Anonymous asked: Hi, physics tutor! Do you think you could explain in layman's terms what a positron is?
Anonymous asked: A person is sled-riding down a hill that is 15.0 ft high. starting at the top with a speed of 10.0 ft/s, the sled reaches the bottom with a speed of 25.0 ft/s. (A) determine whether mechanical energy has been conserved. (B) why might mechanical energy not be conserved? What are the equations that you think I should use?
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Anonymous asked: What factor accounts for the uniform climates of many coastal areas?
February 2013
9 posts
mylipsaresealed-leblonde asked: A particle has constant acceleration vector ⃗a with components ax = 2.9 m/s2 and ay = −2.6 m/s2. Its initial velocity vector ⃗v0 (at time t0 = 0) has components vx0 = 2.6 m/s and vy0 = 2.4 m/s.What is the particle’s speed at time t = 6 s? Answer in units of m/s.
Anonymous asked: A ball is shot out of a canon that is at the edge of a desk. The desk is .53m high and the ball hits 1.48m away. The canon is aimed 45 degrees from the horizon. Calculate for initial velocity.
Anonymous asked: Light passing through a given medium is observed to travel at 2 x 10^8 m/s. What is the index of refraction for this medium? (I actually have NO IDEA how to solve this- I just got this unit and my teacher's been absent since monday, so 1) how do I solve this, and 2) what is the 'index of refraction??)
Anonymous asked: Give the charge, mass and magnitude of weight for 31 moles of a sodium ion with 2 extra electrons. (Avogadro's number is 6.02x1023 and the fundametal charge is 1.602x10-19 C.
mariiiiaaaaa asked: If a doorknob were placed in the center of a door rather than at the edge, how much more force would be needed to produce the same torque for opening the door?
mariiiiaaaaa asked: In what direction should a force be applied to obtain the maximum torque?
yakwiiadubluvr asked: can you explain momentum and impulse?
January 2013
13 posts
Anonymous asked: 3)If u stand at the edge of a high cliff & throw a ball straight upwards at 30 m/s, where will the ball be 8 seconds after u launch it? 4)Velocity & speed will always have the same magnitude, T or F? 5) The change in position of an object divided by the time to took to make that change is called it's ....? Thank you so much, i was wondering how you could help with working out graph...
Anonymous asked: An object falls from rest from a high building. It falls for some time, t, and covers a distance, d. If a similar object falls for time, 2t, how far will it fall?
Anonymous asked: A 0.24 kg rock is thrown vertically upward at 36 m/s. How high did the rock rise?
Anonymous asked: The driver of a truck traveling at 126 km/h on a highway sees a sign which indicated that 800 m after the sign the maximum speed will be 90 km/h . When the truck passes the sign the driver steps on the brake until the truck slows to the new speed limit in the required distance. Assuming the acceleration is constant, how long does it take for the truck to decelerate?
Anonymous asked: An antelope runs 50 metres in 10 seconds. What is it's speed in metres per second.
Anonymous asked: An object is thrown downwards at 20 m/s from the top of the Empire State building in NewYork. This building is 321m tall. Neglecting the effects of air resistance and friction, find how fast will the object be moving when it gets to the ground below.
Wow lots of questions today!
Anonymous asked: A car traveling at 26 runs out of gas while traveling up a 7.0 slope. How far will it coast before starting to roll back down?
Anonymous asked: A 3.00 kg mass is on a frictionless table and is attached to a 1.00 kg vertically-suspended mass The system is released from rest and the 1.00 kg mass falls to the floor through a distance of 1.0 m. The table and pulley are frictionless. What is the kinetic energy of the 1.0 kg mass just before it reaches the floor?
Anonymous asked: if a car can go from 0 to 100 mi/hr in 12 seconds, what would be its final speed after 8.0 seconds if its starting speed were 10 mi/hr
Anonymous asked: Observing electron interference through an ordinary macroscopic two-slit experiment would be extremely difficult and would require very slowly moving electrons. (Slow for an electron means < 103 m/s.) How slowly would electrons have to move through slits spaced 9.30 μm apart in order for the first angular displacement from the central interference maximum to where we observe no electrons to...
Anonymous asked: What is the magnitude of force required to accelerate a car of mass 1.7 × 10³ kilograms by 4.75 meters/second^2
Anonymous asked: i need help with a physics problem
December 2012
1 post
Anonymous asked: What is the formula for average horizontal velocity?
November 2012
13 posts
Anonymous asked: an east bound bike 10 kg, northbound bike 20 kg and south bound bike 15 kg collide going at speeds of 5 mph, 3 mph, and 6 mph respectively. find the speed of the wreck after the collision if they stick together
Anonymous asked: Sadly you have become trapped inside the gravity well of a star of mass M = 8.996 × 1030 kg. At a distance of r0 = 8.654 × 1010 m from the center of the star you find yourself moving directly towards it at 6.015 × 104 m/s (relative to the star). How fast are you moving relative to the star when you inexorably find yourself a distance of rf = 1.791 × 1010 m from its...
Anonymous asked: Three masses are arranged in the (x,y) plane as shown. What is the magnitude of the resulting force on the 2 kg mass at the origin? The value of the universal gravitational constant is 6.6726 x10^-11 N m^2/kg^2. Answer in units of N
Anonymous asked: Calculate the ratio of the kinetic energy to the potential energy of a simple harmonic oscillator when its displacement is 1/7 of its amplitude. (The answer is an integer.)
Anonymous asked: Kirk K. and Arnold S. push on opposite sides of a 13.5 kg, 1.348 m wide uniform door hinged in the standard way as shown in top-down view. (The dimension into the page is irrelevant, and the door can be thought of as a uniform rod.) Kirk applies a force of 276 N at the far edge of the door from the hinge at a 53.13 degree angle as shown, whereas Arnold applies a 747 N force 0.300 m away from the...
Anonymous asked: Two blocks m1 = 5.51 kg , m2 = 11.80 kg are connected via a light rope that passes over a mP = 5.38 kg, uniform cylindrical pulley mounted on a frictionless axle. Attached to m1, is an initially unstretched spring of stiffness 43.4 N/m, that is anchored to the ground. The system is released from rest: m2 falls causing m1 to rise and stretch the spring.What is the linear acceleration of the...
wereyoungwhocares asked: Okay, so I do understand that momentum is Mass times Velocity, and in order for me to find the speed, I need to multiply both the distance travelled and the time taken. So for the momentum for the son, is the question trying trick me by saying, "after the push", and same thing with the speed? That's what is confusing me.
wereyoungwhocares asked: Sorry, this is the rest of the problem, please answer! 3. What is the woman's momentum after the push?(40)(0.55), right? 4. What is her son's momentum after the push?5. What is her son's speed after the push?
Anonymous asked: Find the Magnitude, Direction, Speed, and Momentum? (Physics)?A 40kg woman and her 48kg son are standing at rest on an ice rink. They push against each other for a time of 0.60's, causing them to glide apart. The speed of the woman immediately after they separate is is 0.55 m/s. Include Direction. 1. What is the magnitude of the total momentum of the two people before they push? 2. What is...
Anonymous asked: Hi
Anonymous asked: A 61.5 kg astronaut is 115 m from her spaceship in outer space. In order to return she fires the rockets on her jet pack which has a mass of 15.0 kg for 6.25 s exerting a force of 125.0 N. Identify how each one of newton's laws would explain how the astronaut returned to the ship, and describe specifically how each one explains what occurs.How long will it take altogether for the astronaut to...
Anonymous asked: a pilot flies from point A to point B to point C, in two straight line segments. the displacement vectors Sab for the first leg has a magnitude of 243 km and a direction 50.0 degrees north of east. The displacement vectors Sbc for the second leg has a magnitude of 57.0 and a direction 20.0 degrees south of east. The resultant displacement vector is Sac=Sab + Sbc. What are the magnitude and...
thunderousemotion asked: for this question, /post/34527467891/a-sphere-with-a-moment-of-inertia-0-529mr2-and-mass-m what is w???? what do you use? Please reply by tomorrow, it's urgent!
Anonymous asked: A sea boat travels due east for a distance of 1.60 km and then heads 35.0 degrees north of east for another 3.40 km. Using the method of vector components, calculate the vector sum (both magnitude and direction) of these two displacement vectors. Express the direction relative to due east.
October 2012
12 posts
Anonymous asked: Three vectors A,B,and C add together so that the resultant is zero. Vector A points 30.0 degrees north of east. Vector B points due north. Vector C points 50.0 degrees south of west and has a magnitude of 225 units. By using components, find (a) the magnitude of A and (b) the magnitude of B
Anonymous asked: what are the hand rules in magnetism?
