Question

In: Physics

1. If you have the same mass of water in a bathtub at the same initial...

1. If you have the same mass of water in a bathtub at the same initial temperature your hot bath will last ______ if you were somehow able to increase the specific heat of the water?

a. a shorter time

b. a longer time

c. the same time

2. The Ehrenfest Dog/Flea problem is most similar to the following experiment or problem:

a. a phase change problem

b. a calorimeter problem

c. a Bernoulli's principle problem

d. a specific heat problem

3. In polar areas we have ice floating on water and ice on land. Which of those will raise the sea level by melting?

a. both

b. floating ice melting will raise the sea level, land ice melting will not

c. floating ice melting will not raise the sea level, land ice melting will

d. neither

6. A hydraulic lift has a small cylinder with an area of 0.010 m². The large cylinder of the lift has an area of 1,000 m². If we put a weight of 100 Newtons on the cap of the small cylinger what is the upward force in the large cylinder?

a. 10,000 N

b. 100,000 N

c. One million N

d. ten million N

e 100 million N

Expert Solution

1) Note that more the specific heat, more is the energy needed to change the temperature,

therefore,

If you have the same mass of water in a bathtub at the same initial temperature your hot bath will last A LONGER TIME if you were somehow able to increase the specific heat of the water.

--------------------------------------

2) I am not sure about this but I think it should be phase change

------------------------------------

3) In polar areas we have ice floating on water and ice on land. Which of those will raise the sea level by melting

Answer - floating ice melting will not raise the sea level, land ice melting will

Reason - Floating ice is already in the sea , so it will displace the same volume after it melts as it did before melting. However, melting of ice on land will add more water

-----------------------------------

6)

assuming the pressure is same in small and large cylinders

P1 = P1

F1 / A1 = F2 / A2

where 1 is for large and 2 is for small cylinder

so,

F1 / 1000 = 100 / 0.01

F1 = 10 million Newtons

genius_generous answered 7 months ago

A ball is thrown into a bathtub full of water. The ball has a mass of...

A ball is thrown into a bathtub full of water. The ball has a mass of 0.5 kg and a diameter of 0.22 m. The density of water is 1000 kg/m3 . [Useful info: volume of sphere ?= 4??^3 , where ? is the sphere radius] Please ensure part e) is completed (a) Calculate the weight of the ball. (b) Calculate the buoyant force on the ball if it were completely immersed in water. (c) Determine whether or not the...

Trial 1: Initial mass: 3.4g, final mass: 3.2g, change in mass: 0.2g. Joules absorbed by water:...

Trial 1: Initial mass: 3.4g, final mass: 3.2g, change in mass: 0.2g. Joules absorbed by water: 3012.5J Trial 2: Initial mass: 4.1g, final mass: 3.9g, change in mass: 0.2g. Joules absorbed by water: 3,765.6J 1. Given the energy absorbed by the water and the change in smaple mass, determine the energy content in Joules/gram for each sample 2. Convert the two values determined in #2 to energy content in terms of calories/gram. Note: There are 4,186 J in one food...

- Use the bathtub or water fall analogy to explain incidence and prevalence. Include factors that...

- Use the bathtub or water fall analogy to explain incidence and prevalence. Include factors that affect prevalence rising and falling

For this problem, assume salt water and fresh water have the same density. A large iceberg...

For this problem, assume salt water and fresh water have the same density. A large iceberg floats in the ocean. If the iceberg melts, the sea level will: a) stay the same b) fall c) rise <---wrong answer! Please also provide an explanation!

Consider two planetary orbits with the same energy E. If the two planets have the same mass,...

Consider two planetary orbits with the same energy E. If the two planets have the same mass, but orbit A has a smaller angular momentum than orbit B, which of the following is true? A. Orbit B is open. Orbit A is closed. B. Orbit B has a smaller semimajor axis than orbit A. C. The period of orbit A is greater than that of orbit B. D. Orbit A is more elongated (more eccentric) than B. True or false: Light always...

Consider a completely elastic head-on collision between two particles that have the same mass and the same speed.

Consider a completely elastic head-on collision between two particles that have the same mass and the same speed. What are the velocities after the collision? The magnitudes of the velocities are the same but the directions are reversed. One of the particles continues with the same velocity, and the other reverses direction at twice the speed. Both are zero. One of the particles continues with the same velocity, and the other comes to rest. More information is required to determine the final velocities.

A coin and a ring have the same mass and radius. Starting from rest and the...

A coin and a ring have the same mass and radius. Starting from rest and the same height, they roll down the same incline. In other words, they both start with the same gravitational potential energy. Which one of the following statements is true about the coin and ring when they reach the bottom of the incline? A. The increase in the coin's total kinetic energy is less than the increase in the ring's total kinetic energy. B. The increase...

Two substances, A and B, have the same mass. Substance A is at a higher temperature...

Two substances, A and B, have the same mass. Substance A is at a higher temperature than B, and heat transfers between them until equilibrium is reached. The decrease in the temperature of A is less than the increase in temperature of B. Which substance has the larger specific heat?

A hoop, a solid disk, and a solid sphere, all with the same mass and the same radius, are set rolling without slipping up an incline, all with the same initial kinetic energy.

A hoop, a solid disk, and a solid sphere, all with the same mass and the same radius, are set rolling without slipping up an incline, all with the same initial kinetic energy. Which goes furthest up the incline? The hoop The disk The sphere They all roll to the same height Briefly explain your answer to the previous question. The same three objects as in the previous question are set rolling without slipping up an incline, all with the same initial linear speed. Which goes farthest...

A piston encloses 1 lbm of water in an initial volume of 0.3 ft^3. The initial...

A piston encloses 1 lbm of water in an initial volume of 0.3 ft^3. The initial temperature is 120F. The piston leaves the stops at a pressure of 150 psia. The water is heated from it's initial state to a final temperature of 400F. a) Draw the process on a P-v diagram with respect to saturation lines. b) Evaluate the work done by the H2O. c) Determine the volume occupied by the liquid at the initial state and when the...