How many US pennies (mass 2.5 grams) can you stack on an ice cube having a mass of 4.20 kg floating in water, before it starts to sink? (let the density of the water be 1000 kg/m3 and the ice cube be 917 kg/m3)

1. Define the ff:
A. Heat-

B. Heat capacity-

2. Why is it desirable to have the water a few degrees colder than room temperature when the initial temperature is taken?

3. Why is the mass of the outer shell of the calorimeter and the insulating ring not included in taking data for Calorimetry?

6. Why should the hot metal be dry before it is introduced into the cold water? 837 calories of heat are required to heat 100.00 grams of copper from 0.0 C to 100.0 C. What is the specific heat of copper?

***Determining specific heat through insulating through coffee cup. Aluminum is heated and then immediately put in a thermal cup containing water.. Shaked.. then Final Temperature is determined.

4. What does this experiment show about the specific heat of water?

5. How does the conductivity of the metal used in this experiment affect the accuracy of the results?

5. You throw a ball into the air. It takes 6.0 ? for the ball to reach your hand.

a. Determine the initial speed at which the ball was thrown.

b. Determine the final velocity of the ball when it hits your hand.

A red ball is thrown down with an initial speed of 1.3 m/s from a height of 27 meters above the ground. Then, 0.5 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 23.9 m/s, from a height of 0.7 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.

1)

What is the speed of the red ball right before it hits the ground?

m/s

Your submissions:

2)

How long does it take the red ball to reach the ground?

s

Your submissions:

3)

What is the maximum height the blue ball reaches?

m

Your submissions:

4)

What is the height of the blue ball 2 seconds after the red ball is thrown?

m

Your submissions:

5)

How long after the red ball is thrown are the two balls in the air at the same height?

s

Your submissions:

6)

Which statement is true regarding the blue ball?

After it is released and before it hits the ground, the blue ball is always moving faster than the red ball at any given time.

After it is released and before it hits the ground, the blue ball is sometimes moving faster than the red ball at any given time.

After it is released and before it hits the ground, the blue ball is never moving faster than the red ball at any given time.

Your submissions:

7)

Which statement is true about the red ball?

The acceleration is positive and it is speeding up

The acceleration is negative and it is speeding up

The acceleration is positive and it is slowing down

The acceleration is negative and it is slowing down

Question) In a Hooke's Law and Pendulum experiment, what are the possible uncertainties or errors that could occur and also how would you fix them? (min 300 words)

M, a solid cylinder (M=1.35 kg, R=0.117 m) pivots on a thin, fixed, frictionless bearing. A string wrapped around the cylinder pulls downward with a force F which equals the weight of a 0.670 kg mass, i.e., F = 6.573 N. Calculate the angular acceleration of the cylinder. Tries 0/10 If instead of the force F an actual mass m = 0.670 kg is hung from the string, find the angular acceleration of the cylinder. Tries 0/10 How far does m travel downward between 0.450 s and 0.650 s after the motion begins? Tries 0/10 The cylinder is changed to one with the same mass and radius, but a different moment of inertia. Starting from rest, the mass now moves a distance 0.470 m in a time of 0.510 s. Find Icm of the new cylinder.

A solid cylinder initially rolling with a translational speed of 4.5m/s rolls down a vertical drop of 0.625m. The cylinder has a mas of 7.25 Kg and a diameter of 0.115m. Ignore frictional losses and assume the mass of the cylinder is distributed uniformly. find transnational speed at the bottom of the drop

Church organs have a set of pipes with different lengths. With those different pipes organs can produce sounds over a wide range of frequencies. If the lowest frequency produced by an organ is 31.6 Hz, and the highest frequency is 1.80 kHz, then what is the shortest possible wavelength of sound the organ can produce? Assume that the speed of sound is 336 m/s.
B) What is the longest possible sound wavelength the organ can produce?

The small spherical planet called "Glob" has a mass of 6.50×10¹⁸ kg and a radius of 5.60×10⁴ m. An astronaut on the surface of Glob throws a rock straight up. The rock reaches a maximum height of 1.64×10³ m, above the surface of the planet, before it falls back down.

-What was the initial speed of the rock as it left the astronaut's hand? (Glob has no atmosphere, so no energy is lost to air friction. G = 6.67×10^-11 Nm²/kg².)
(in m/s)

-A 33.0 kg satellite is in a circular orbit with a radius of 1.40×10⁵ m around the planet Glob. Calculate the speed of the satellite.
(in m/s)

A solid sphere has a temperature of 674 K. The sphere is melted down and recast into a cube that has the same emissivity and emits the same radiant power as the sphere. What is the cube's temperature in kelvins?

The first and second formants when you make an "ee" vowel sound are approximately 270 Hz and 2300 Hz . The speed of sound in your vocal tract is approximately 350 m/s . If you breathe a mix of oxygen and helium (as deep-sea divers often do), the speed increases to 810m/s

With this mix of gases, what are the frequencies of the two formants?

. You are holding a shopping basket at the grocery store with two 0.62-kg cartons of cereal at the left end of the basket. The basket is 0.61 m long. Where should you place a 1.9-kg half gallon of milk, relative to the left end of the basket, so that the center of mass of your groceries is at the center of the basket?

1. What is the minimum value of l for a subshell that has 11 electrons in it?

2. If a hydrogen atom has its electron in the n = 6 state, how much energy in eV is needed to ionize it?

3. What is the smallest angle in degrees that S makes with the z -axis for an l = 1 electron?

Q: A child is running at her maximum speed of 4.0 m/s to catch an ice-cream truck, which is stopped at the side of the road. When the child is 20 m from the truck, the ice-cream truck starts to accelerate away at a rate of 1.0 m/s² . Does the child catch the truck? solve this problem algebraically and graphically.