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max2010maxim [7]
3 years ago
10

A group of students decides to set up an experiment in which they will measure the specific heat of a small amount of metal. The

metal has a mass of about 5 grams.
They hang the metal in a beaker of boiling water for a long time (10 minutes or so). Then, they very quickly (within a few seconds) remove the metal from the boiling water and transfer it to a styrofoam cup of 150 mL of water at room temperature. There is a thermometer in the styrofoam cup. They know that the rise in temperature will tell them what they need to know in order to determine the specific heat of the metal, so they watch the thermometer closely... but nothing happens. The temperature does not appear to change at all.

Each student has a different suggestion for how to improve the experiment. Which of the suggestions is least likely to help?

A. Use less room temperature water in the styrofoam cup
B. Use more metal (50 grams instead of 5 grams)
C. Use more boiling water in the first beaker
D. Use a more sensitive thermometer.
Physics
1 answer:
lesya692 [45]3 years ago
7 0
I think the answer is C
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Question 7 of 10
Dahasolnce [82]
Kinetic friction (also referred to as dynamic friction) is the force that resists the relative movement of the surfaces once they're in motion.
https://www.khanacademy.org › stat...
Static and kinetic friction example (video) | Khan Academy

Answer a would be static friction
Answer b is fluid friction
(Air resistance is fluid friction. Fluid friction is the friction experienced by objects which are moving in a fluid and the air is a fluid.)
Answer c is static friction
ANSWER D IS KINETIC FRICTION

Hope this helps :D



4 0
2 years ago
Which is not one of the forms that energy can take?
sladkih [1.3K]
Question 1: Newtonian. It refers to work of Newton. Light, electrical and chemical energies are different forms of energy. 
Question 2: Nuclear power plants. Heat , Sunlight and energy in atoms are not nuclear energies. 
Question 3: Batteries. the other two are examples of mechanical energy. But batteries are examples for chemical energy.
4 0
3 years ago
Read 2 more answers
An empty parallel plate capacitor is connected between the terminals of a 18.8-V battery and charges up. The capacitor is then d
Basile [38]

Answer:

p.d' = 37.6 V

Explanation:

From the question we are told that:

Potential difference p.d=18.8V

New Capacitor C_1=C_2/2

Generally the equation for Capacitor capacitance is mathematically given by

C=\frac{eA}{d}

Generally the equation for New p.d' is mathematically given by

 C_2V=C_1*p.d'

  p.d' = 2V

 p.d'= 2 * 18.8

 p.d' = 37.6 V

7 0
3 years ago
A system consists of a disk rotating on a frictionless axle and a piece of clay moving toward it, as shown in the figure above.
cestrela7 [59]

Explanation:

Forgive me If I am wrong, it's been a while since I've studied Torque.

The formula for the angular momentum is

momentum= I*w.

We can also write I*W as 1/2MR^2 * W so the extra mass coming from the block of clay would most likely cause the angular momentum to increase from the amount it was before.

6 0
2 years ago
Be sure to answer all parts. By what factor does the fraction of collisions with energy equal to or greater than activation ener
qwelly [4]

Answer:

Factor = 8.77

Explanation:

Fraction of collision with energy greater than or equal to the activation energy  can be given by the formula:

f = \exp(\frac{-E_{a} }{RT} )

E_{a}  = Activation Energy\\E_{a}  = 100 kJ /mol\\E_{a}  = 10^{5} J /mol\\

R = 8.314 J/mol.K

When Temperature = 34⁰C = 34 + 273 = 307 K

f_{1}  = \exp(\frac{-10^{5}  }{8.314 * 307} )\\f_{1} = \exp(\frac{-10^{5}  }{2552.398} )\\f_{1}  = \exp(-39.18)\\f_{1} = 964.59 * 10^{-20}

When Temperature =  52⁰C = 52 + 273 = 325 K

f_{2}  = \exp(\frac{-10^{5}  }{8.314 * 325} )\\f_{2}= \exp(\frac{-10^{5}  }{2702.05} )\\f_{2}= \exp(-37.009)\\f_{2} = 8456.6 * 10^{-20}

\frac{f_{2}}{f_{1}}= \frac{8456.6 * 10^{-20} }{964.59 * 10^{-20} }

Factor = 8.77

8 0
3 years ago
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