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Physics
Physics
High School
Calculate the time t for the pencil to hit the ground, assuming that it falls from standing perfectly vertical and maintains this angular acceleration.
Physics
High School
what is the rest energy of an electron, given its mass is 9.11 x 10-31 kg? give your answer in joules and mev. (1 mev
Physics
High School
which 'energy system' is utilized during very high intensity, shorter exercise, like sprinting a 400 m?
Physics
College
A student with a mass of 55 kg rides a bicycle at a speed of 5.0 m/s. The momentum of the bicycle and rider equals 320 kg x m/s.a. What is the combined mass of the student and bicycle?b. How fast would the bicycle alone have to move in order to have the same momentum as that of the student and bicycle together?
Physics
High School
if you know all of the forces acting on an object and you know the mass of that object, what quantities can you figure out from that information?
Physics
High School
a 70-kg person rides in a 30-kg cart moving at 12 m/s at the top of a hill that is in the shape of an arc of a circle with a radius of 40 m. (a) what is the apparent weight of the person as the cart passes over the top of the hill? (b) determine the maximum speed that the cart may travel at the top of the hill without losing contact with the surface. does your answer depend on the mass of the cart or the mass of the person? explain.
Physics
High School
find the binding energy of carbon-12 per nucleon. the mass of a proton is 1.007276 u, of a neutron 1.008665 u, and of carbon 11.996706 u.
Physics
College
An object is thrown down from a tall building with an initial velocity of 2 m/s. How fast is it going after 5 seconds of free fall?
Physics
High School
a structure containing a central atom surrounded by three electron groups will have a planar arrangement in which the ideal bond angle is .
Physics
High School
in order to keep a small satellite from drifting into a nearby asteroid, it is placed in orbit with a period of 3.02 hours and radius of 2.0 km. what is the mass of the asteroid?
Physics
High School
describe a series circuit. include in your description the current path and the magnitude of the current in each load
Physics
High School
a mass m at the end of a spring oscillates with a frequency of 0.83 hz. when an additional 680-g mass is added to m, the frequency is 0.60 hz. what is the value of m? .
Physics
High School
A person stands 101010 meters east of an intersection and watches a car driving towards the intersection from the north at 131313 meters per second. At a certain instant, the car is 242424 meters from the intersection. What is the rate of change of the distance between the car and the person at that instant (in meters per second)?.
Physics
High School
If the altitude of the North Star is 30 above the horizon, then what is the highest altitude that the Sun will reach during the Autumnal Equinox: __________degrees
Physics
High School
g a metal ring with a clockwise current produces a magnetic field (right-hand-rule). if the current increases (which increases the field) over time, what direction will the induced current on the ring be?
Physics
High School
what initial speed must an alpha particle have to just touch the surface of a gold nucleus before being turned back? assume the nucleus stays at rest. hint: the alpha particle is not a point particle. what is the initial energy (in mev) of the alpha particle?
Physics
High School
Suppose the mower is moving at 1. 5 m/s when the force f is removed. How far (in m) will the mower go before stopping?.
Physics
College
In its search for flying insects, a bat uses an echolocating system based on pulses of high frequency sound. These pulses are 2.60 ms in duration, have a frequency of 50.0 kHz, and an intensity level of 120 dB at 1.25 m from the bats mouth. Assume the bat produces acoustic waves in a cone with a total angle of 32o . (a) What is the acoustic power of each pulse? (b) How much acoustic energy is there in each pulse? (c) What is the intensity level at a conical surface centered on the bat with radius equal to 6.50 m? (d) A June bug is located 6.5m from the bat. The effective cross-sectional area of the insect is 14.0 mm2 . How much of the acoustic power emitted by the bat strikes the insect? (e) Assume all the acoustic power intercepted by the June bug goes into the reflected wave which is hemispherical. What is the intensity level of the reflected wave at the bats ears?
Physics
College
The magnitude of vector A is 9.4 units, and it points in the +x-direction, while a second vector B points in the +y-direction.(a) If the vector A + B points 54 counterclockwise from the +x-direction, what is the magnitude of B? __?__ units(b) What is the magnitude of A + B? __?___ units
Physics
College
part a assuming that this force is constant, what is the magnitude j of the impulse on the ball? enter your answer numerically in newton seconds using two significant figures.
Physics
High School
The energy from the light is captured and stored by the surface without being reflected or transmitted. What happened to the energy from the light?.
Physics
High School
two uniform spheres simultaneously start rolling (from rest) down an incline. one sphere has twice the radius and twice the mass of the other. (a) which reaches the bottom of the incline first? (b) which has the greater total kinetic energy at the bottom?
Physics
College
A cd player with a resistance of 40 ohms has a current of 0.1 amos flowing through it. How many volts supply the cd player
Physics
High School
Oh no! You did not stop in time as you were trying to brake to avoid getting in an accident. If your velocity changed from 29 m/s to 15 m/s all within 2.3 seconds, what is the acceleration you hit the car in front of you as you tried to stop? NOTE: Are you accelerating or decelerating in this case? How will this affect your acceleration value?A. 6.1 m/s2B. -0.4 m/s2C. -6.1 m/s2D. -1.8 m/s2
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