1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
shutvik [7]
2 years ago
5

5. What types of surfaces would result in greater friction?

Chemistry
1 answer:
Varvara68 [4.7K]2 years ago
5 0

Answer:

<em>Rough </em><em>and </em><em>irregular</em><em> </em><em>surface</em>

<em>these</em><em> </em><em>surfaces</em><em> </em><em>tends </em><em>a </em><em>lot </em><em>of </em><em>friction</em><em> </em>

<em>but </em><em>on </em><em>smooth</em><em> </em><em>surface</em><em> </em><em>there </em><em>is </em><em>least </em><em>friction</em>

<em>hope</em><em> it</em><em> helps</em>

You might be interested in
Why is the energy supplied by the cooker greater than that calculated ?
TEA [102]

Answer:

Explanation:

Q1.

(a) 46 200

accept 46 000

allow 1 mark for correct substitution

ie 0.5 × 4200 × 22 provided no subsequent step

2

(b) Energy is used to heat the kettle.

[3]

Q2.

(a) (approximate same size particles as each other and as liquid and gas) touching

do not accept particles that overlap

regular arrangement (filling the square)

(b) condensing

(c) solid

(d) physical

(e) particles have more kinetic energy

particles move faster

(f) mass of the liquid

specific latent heat of evaporation

(g) 2 × 4 200 × 801

672 000 (J)

an answer of 672 000 (J) scores 2 marks

[11]

Q3.

(a) x-axis labelled and suitable scale

Page 12 of 13

points plotted correctly

allow 5 correctly plotted for 2 marks, 3−4

correctly plotted for 1 mark

allow ± ½ square

2

line of best fit

(b)

allow ecf from line of best fit in part (a)

0.075 (°C/s)

an answer of 0.075 (°C/s) scores 2 marks

(c) Δθ = 11.5 (°C)

a calculation using an incorrect temperature

scores max 3 marks

ΔE = 1.50 × 900 × 11.5

ΔE = 15 525 (J)

ΔE = 15.525 (kJ)

an answer of 15.525 (kJ) or 15.53 (kJ) or 15.5

(kJ) scores 4 marks

an answer of 15 525 (kJ) scores 3 marks

[10]

Q4.

(a) 80 °C

ΔE = 0.5 × 3400 × 80

ΔE = 136 000 (J)

an answer of 136 000 (J) scores 3 marks

(b) energy is dissipated into the surroundings

allow any correct description of wasted energy

(c) put a lid on the pan

allow any sensible practical suggestion

eg add salt to the water

Page 13 of 13

(d) efficiency = 300/500

efficiency = 0.6

an answer of 0.6 or 60% scores 2 marks

allow efficiency = 60%

an answer of 0.6 with a unit scores 1 mark

an answer of 60 without a unit scores 1 mark

7 0
2 years ago
What happens after you leave oil and vinegar in a glass for a few minutes?
MAVERICK [17]

Answer:

An emulsion is formed.

Explanation:

An association (emulsion) of two liquids is formed, in this case oil and vinegar, which when stirred, said mixture will separate.

3 0
3 years ago
I really need help please
Greeley [361]

Answer:

I think it's B

hope this helps

5 0
3 years ago
If the map shows the average high temperature in July for two cities in Texas. like Del Rio=36°c
Sedbober [7]

Answer:

D

Explanation:

Ocean breezes keep coastal galveston cooler than Del Rio, which is inland exposed to southerly winds.

4 0
3 years ago
How many moles of Na2SO4, are produced from 7.00 moles of (NH4)2SO4?
Harlamova29_29 [7]

Answer:

dumb stupid restarted illiterate STUPID students ARE JUST GOING TO DIE

8 0
3 years ago
Other questions:
  • A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.150 g of this subunit w
    12·1 answer
  • In the following reaction, what coefficient will be written before the oxygen molecule (O2) to balance the chemical equation? (1
    11·2 answers
  • Arrange the following particles from smallest to largest. <br> F, F^-1, Br, Br^-1
    10·1 answer
  • A bell hanging at the top of a tower has 8,550 j of energy. If it has a mass of 20 kg find the height of the Bell
    6·1 answer
  • How do you find the mole ratio of a compound?
    11·1 answer
  • Escriba las fórmulas semi desarrollada y global correspondientes a: 2,3-dimetil-1-penteno
    8·1 answer
  • . Deltas form mainly due to
    7·2 answers
  • Temperate grasslands have trees and shrubs <br> True or false
    6·2 answers
  • The reaction below shows how silver chloride can be synthesized. AgNO3 NaCl Right arrow. NaNO3 AgCl How many moles of silver chl
    9·2 answers
  • Hich statement
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!