A red ball is thrown down with an initial speed of 1 m/s from a height of 26 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 23.5 m/s, from a height of 1 meters above the ground. The force of gravity due to the earth results in the balls each having a constant downward acceleration of 9.81 m/s2.
What is the speed of the red ball right before it hits the ground?
How long does it take the red ball to reach the ground?
What is the maximum height the blue ball reaches?
What is the height of the blue ball 1.9 seconds after the red ball is thrown?
How long after the red ball is thrown are the two balls in the air at the same height?
In: Physics
35% of the heat released from burning fuel in a campstove actually goes to heating a pot and its contents. You start with 1.3 kg of ice at -17 °C, 1.1 L of water at 22 °C, and a 360 gram aluminum pot at 28 °C. The ice and water are put into the pot and the system is heated to 100 °C with 22% of the liquid boiling away. The specific heat of aluminum is 0.22 cal/g-°C. The specific heat of ice is 0.5 cal/g-°C. One gram of fuel produces 46000 J when it is burned.
HINTS: Consider each part (ice, water, and pot separately)
HINTS: The given % that boils away is a combination of the melted ice and the water.
HINTS: Fuel doesn't come into play yet
1. How much heat is required to go into the pot and water?
In: Physics
Describe the physics and draw an illustration of charge polarization.
In: Physics
A physics student who is also a pilot is preparing to fly from the Daydon airport home to Kalona Iowa which is due west. Her plane flies with an airspeed (its speed relative to the air) of 106 knots. There is a strong wind blowing at 25 knots coming from the Northwest.
a. What heading should she fly? In other words, what direction should she aim the plane as she flies if she wants to go directly to Kalona? (In degrees North of due West.)
b. What will her ground speed be?
In: Physics
Lab background:
I set up two styrofoam cups attached together by an aluminum
transfer bar (a conductor). One cup contained 200g of boiling
water, while the other cup contained only 100g of ice water. Every
two minutes, I took the temperature of both the cups. There were
two slits on the top of the enclosed styrofoam cups to allow a
thermometer to take the temperature of both of the contents in the
two cups. It seems as though, the hot water LOST heat nearly twice
as fast as the cold water gained heat.
Question 1: Why did this happen??? Does it have to do with the
different volumes/ surface area?
Question 2: I later calculated the heat lost by the hot water and the heat gained by the cold water (which, technically, should be the same consiering the laws of thermodynamics). Heat lost= 27720 J and heat gained= 11340 J. So they are clearly not the same ... what 2 reasons could cause the difference???
Questions 3: How do I estimate at which both containers should stabilize???
thanks
In: Physics
A straight, nonconducting plastic wire 7.00 cmlong carries a charge density of 100 nC/mdistributed uniformly along its length. It is lying on a horizontal tabletop.
Find the magnitude and direction of the electric field this wire produces at a point 4.00 cm directly above its midpoint.
If the wire is now bent into a circle lying flat on the table, find the magnitude and direction of the electric field it produces at a point 4.00 cm directly above its center.
In: Physics
1.) The Hubble Space Telescope orbits the Earth at an approximate altitude of 612 km. Its mass is 11,100 kg and the mass of the Earth is 5.97×1024 kg. The Earth's average radius is 6.38×106 m. What is the magnitude of the gravitational force that the Earth exerts on the Hubble? (Answer in N)
|
2.) A planetoid has a mass of 2.310e+21 kg and a radius of 7.00×105 m. Find the magnitude of the gravitational acceleration at the planetoid's surface. (Answer in m/s^2)
|
In: Physics
An infinitely long line of charge has a linear charge density of 5.00×10−12 C/m . A proton is at distance 16.0 cm from the line and is moving directly toward the line with speed 1000 m/s .
How close does the proton get to the line of charge?
In: Physics
In Fig, take E0 = 12 V, R1 = 4.0 W, R2 = 8.0 W, R3 = 2.0 W, and L = 2.0 H. What is the current I2 (a) immediately after the switch is first closed and (b) a long time after the switch is closed? (c) After a long time the switch is again opened. Now what is I2?
The Problem with the picture is on Problem 36 in the website below
https://www-physics.ucsd.edu/students/courses/winter2010/physics2b/hw/hw9.pdf
In: Physics
A 73.0 kg ice hockey goalie, originally at rest, catches a 0.150 kg hockey puck slapped at him at a velocity of 39.0 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would their final velocities (in m/s) be in this case? (Assume the original direction of the ice puck toward the goalie is in the positive direction. Indicate the direction with the sign of your answer.)
Puck: ____
Goalie: ____
In: Physics
A mass is attached to a string on a pulley, when the mass is falling what direction is the pulley spinning? Which direction do the vectors for torque, angular acceleration, and angular velocity point? What about when the mass is going back up? Please draw a diagram showing these vectors.
In: Physics
Calculate the Q value for each of the following reactions. You may need to look up some of the atomic masses on the web. You can find a good one by typing in ``atomic mass nist'' into Google. Express your answer in MeV.
In: Physics
A 62.5 kg skier is moving at 6.15 m/s on a frictionless, horizontal snow-covered plateau when she encounters a rough patch 4.00 m long. The coefficient of kinetic friction between this patch and her skis is 0.320. After crossing the rough patch and returning to friction-free snow, she skis down an icy, frictionless hill 3.35 m high.
A)How fast is the skier moving when she gets to the bottom of the hill?
BHow much internal energy was generated in crossing the rough patch?
In: Physics
Use Gauss's law to prove that the electric field outside any spherically symmetric charge distribution is the same as if all of the charge were concentrated into a point charge at the center of the sphere. Then use Gauss's law to prove that the electric field inside a spherically symmetric conductor carrying a net charge on its surface is zero.
In: Physics
Ok the question asks
Know the definitions for the following terms(writing the equation/formula only is not enough):
Magnetic Flux
Faraday's Law
Lenz's Law
It asks for all 3 and again just writing equation/formula is not enough.
In: Physics