505 Answered Questions for the topic AP physics

02/09/18

How do I solve this AP Chemistry problem on catalysts?
 A famous chemical demonstration is the "magic genie" procedure, in which hydrogen peroxide decomposes to water and oxygen gas with the aid of a catalyst. The activation energy of this... more
Follows • 1
Expert Answers •1

02/07/18

How do I solve this AP Chemistry problem on the decomposition of HI(g)?
The activation energy for the decomposition of HI (g) to H2 (g) and I2 (g) is 186 kJ/mol. The rate constant at 555K is 3.52×10^-7 L/mol•s. What is the rate constant at 645K?
Follows • 2
Expert Answers •1

02/07/18

How do I solve this Chemistry problem on activation energy and calculating the value of k?
 The reaction (CH3)3CBr+ OH==>(CH3)3COH+Be   In a certain solvent is first order with respect to (CH3)3CBr and zero order with respect to  OH-. In several experiments, the rate constant k was... more
Follows • 2
Expert Answers •1

02/07/18

How do I solve this Chemistry problem on activation energy?
The rate constant  for the gas phase decomposition of N2O5 has the following temperature dependence    T (K)       k (s^-1)               4.9×10^-3 338.        5.0×10-4 318         ... more
Follows • 2
Expert Answers •1

02/07/18

How do I solve this AP Chemistry problem?
How do I calculate the activation energy for the reverse of the reaction NO(g) +CO(g) ==>NO(g) CO₂(g), given the activation energy for the forward reaction for the forward reaction is 125kJ/mol... more
Follows • 2
Expert Answers •1
Ap Physics Science Physics Work

01/18/18

Physics Power and Work
A 49kg bicycle rider delivers an average of 0.28 hp. The mass of the bicycle is 2.1kg and the hill she is climbing is 245m tall. How much time will this take?
Follows • 2
Expert Answers •1
Ap Physics Math Science Chemistry

01/15/18

How do I solve this problem on the critical point of NH3?
The critical point of NH3 is 132°C and 111 atm and the critical point of N2 is -147°C and 34 atm. Which of these substances cannot be liquefied at room temperature no matter how much pressure is... more
Follows • 1
Expert Answers •1
Ap Physics Math Science Chemistry

01/15/18

How do I solve this problem on air conditioners and evaporation?
In regions with dry climates, evaporative coolers are used to cool the air. A typical electric air conditioner is rated at 1.00×10^4 Btu/he. What quantity of water must be evaporated each hour to... more
Follows • 2
Expert Answers •1
Ap Physics Math Science Chemistry

01/15/18

How do I solve this Chemistry problem on the phase changes of water?
A 20.0-g sample of ice at -10°C is mixed with 100.0 g of water at 80°C. Calculate the final temperature of assuming no heat loss to the surroundings. The heat of capacities of ice and water are... more
Follows • 2
Expert Answers •1
Ap Physics Math Science Chemistry

01/15/18

How do I solve this AP Chemistry on Boron Nitride?
Boron Nitride ( BN) exists in two forms. The first is a slippery solid former from the reaction from BCl3 and NH3, followed by heating in a ammonia atmosphere at 750°C. Subjecting the first form of... more
Follows • 1
Expert Answers •1

01/14/18

How do I solve this problem on methyl salicylate and methyl 4-hydroxybenzoate?
Methyl salicylae has a melting point of -8°C.   methyl 4-hydroxybenzoate, another molecule with the exact  same molecular formulabhas a melting point of 127°C.   Why is there such a large... more
Follows • 2
Expert Answers •1

01/13/18

Can you help me with this problem on diethyl ether?
Diethyl ether was one of the first chemicals used as an anesthetic. At 34.6°C, diethyl ether has a vapor pressure of 760 torr, and at 17.9°C, it has a vapor pressure of 400 torr. What is the heat... more
Follows • 2
Expert Answers •1

01/13/18

What role does humidity play in how our bodies regulate temperature?
A common response hearing that the temperature in New Mexico is 105°F is, "It's not that bad; it's a dry heat", whereas at the same time, the summers in Atlanta, Georgia are the characterized as... more
Follows • 2
Expert Answers •1

01/13/18

How does evaporation of alcohol remove heat energy from a person's body?
When a person has a severe fever, one therapy used to reduce the fever is an "alcohol rub". Explain how the evaporation of alcohol from a person's skin removes heat energy from the body.
Follows • 1
Expert Answers •1

01/13/18

Can you help me with this problem on Xenon?
Consider the following data for Xenon:   Triple point: -121°C, 280 torr Normal melting point: -112°C Normal boiling point: -107°C   Which is more dense, liquid or solid Xe? How do the melting... more
Follows • 1
Expert Answers •1
Ap Physics Math Science Chemistry

01/13/18

How do I solve this AP Chemistry problem on melting point and phase change?
The melting point of a fictional X is 225°C at 10.0 atm. If the density of the solid phase of X is 2.67 g/cm^3 at 10.0 atm. And the density of the liquid phase is 2.78 g/cm^3 at 10.0 atm. Predict... more
Follows • 1
Expert Answers •1
Ap Physics Math Science Chemistry

01/11/18

How do I calculate the boiling point of water at a specific atmospheric pressure?
In Breckenridge, Colorado, the typical atmospheric pressure is 520 tore. What is  the boiling point of water in Breckenridge? Delta H (vaporization)= 40.7 kJ/mol.
Follows • 2
Expert Answers •1
Ap Physics

01/03/18

Rotational period
A star is rotating at 5.55x10-5Πrad/s, its velocity decelerates at a constant rate of 0.5x10-9 π rad/s2. What is the current rotational period of that star (in hours)?  What is the formula you use... more
Follows • 2
Expert Answers •1

12/30/17

Physics Mechanical Energy and Friction
An asteroid with a mass of 5.0 x 105 kg collides with the Earth and slides horizontally along the ground without bouncing (not actually possible but just pretend). The velocity of the asteroid... more
Follows • 2
Expert Answers •1
Ap Physics Physics

12/12/17

Physics Conceptual Word Problems I am confused with.
1. A ball is dropped from an unknown height and allowed to bounce until it comes to rest.  Each bounce is lower than the previous one.  Does the law of conservation of energy hold true for this... more
Follows • 2
Expert Answers •1

12/11/17

How do I solve this light/energy problem?
In the investigation of the electronic absorption spectrum of a particular element, it is found that a photon having a wavelength  of 500nm provides just enough energy to promote an electron from... more
Follows • 3
Expert Answers •2

12/11/17

KClO3(s) produces KCl and O2 when heated. 2.34L of O2 was collected over water at 9878mmHg at 65°C. What mass of KClO3 reacted?
How do I solve this AP Chemistry problem?
Follows • 2
Expert Answers •1

12/11/17

How do I calculate what mass of CO2 can be by mixing 2.34g of C2H5OH with 5.6L oxygen at 78°F
The reaction occurs at 900 mmHg and the formula for the reaction is: C2H5OH+O2===> CO2+H2O
Follows • 3
Expert Answers •2

12/11/17

Can you help me with this gas law problem?
What volume will 1.23g of CO2 occupy at 45°C and 678 mmHg?
Follows • 2
Expert Answers •1
Ap Physics

11/28/17

How much work is done by hand
A mass of 20 kg compresses a spring 50 cm. The spring is then compressed an additional 2 meters by hand and then the mass and spring are released. Spring constant is 392 N/mA)During compression... more
Follows • 2
Expert Answers •1

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.