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
madam [21]
3 years ago
8

The C-14 decay is used to estimate the age of an old dead tree. The activity of C-14 in the dead tree is determined to have fall

en to 21% of its original value. C-14 has a half-life of 5700 years. Calculate, in years, the age of the dead tree.
I used the relevant formula but somehow my answer does not match with the markscheme. Can you help me?
Physics
1 answer:
meriva3 years ago
7 0
From the calculations i did, its 1197. Is that the one you got?
You might be interested in
What element from the periodic table produces blue color in fireworks
sattari [20]
The answer is going to be element #29 Copper makes blue 
Red:#38 
Green:#56
Pink:#3
Yellow:#11
Gold:#20
Hopes This Helps 
4 0
3 years ago
Read 2 more answers
Solids diffuse because the particles cannot move.
Nastasia [14]

Solids cannot diffuse.

4 0
3 years ago
Read 2 more answers
What was the result of the Mexican army's victory over the Texan garrison at the Alamo?
sasho [114]

The result of the Mexican victory was that fallen defenders became heroes to the cause of Texan independence.<span> The Battle of the Alamo took place between February 23 and March 6, 1836 and became the central episode of the Texas Revolution . After this thirteen-day battle, the Mexican troops of General President Antonio Lopez de Santa Anna began an attack on San Antonio de Bexar, the current San Antonio in Texas. The Battle of the Alamo fought the army of Mexico against a group of Texan rebels, mostly American settlers. More than four thousand men from Santa Ana stood in front of the Alamo Fort , the last stronghold of the rebels, which barely reached 187. The Alamo was not a fortress prepared to withstand a siege. It is believed that all the rebels of the Alamo died in the siege, but Santa Anna came to lose up to about 900 men during the days that lasted the fight. However, the worst result for Santa Ana was precisely the resistance that the Texan rebels had in the Alamo, which fostered the fighting spirit of the Texans. A few days later, on March 14, 1836, Texas became independent from Mexico and a month later, Santa Ana was imprisoned.</span>

3 0
3 years ago
Read 2 more answers
A delivery truck travels with a constant velocity up an 8 slope. A 60 kg box sits on the floor of the truck and, because of sta
Blababa [14]

Explanation:

Given that,

The slope of the ramp, \theta=8^{\circ}

Mass of the box, m = 60 kg

(a) Distance covered by the truck up the slope, d = 300 m

Initially the truck moves with a constant velocity. We know that the net work done on the box is equal to 0 as per work energy theorem as :

W=\dfrac{1}{2}m(v^2-u^2)=0

u and v are the initial and the final velocity of the truck

(b) The work done on the box by the force of gravity is given by :

W=Fd\ cos\theta

Here, \theta=90+8=98^{\circ}

W=mgd\ cos\theta

W=60\times 9.8\times 300\ cos(98)

W = -24550.13 J

(c) What is the work done on the box by the normal force is equal to 0 as the angle between the force and the displacement is 90 degrees.

(d) The work done by friction is given by :

W_f=-W

W_f=24550.13\ J

Hence, this is the required solution.

6 0
3 years ago
While a balloon is being filled, if the temperature of the air in the balloon decreases, what happens to its volume?
Ugo [173]
Why is it always balloons?
anyways so the balloon volume goes somewhere else when it shrinks because the balloon is losing air i think
4 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following conditions will maximize the amount of interest you earn?
    8·1 answer
  • Acid rain breaks down rocks by reacting with their minerals. This process is an example of?
    12·2 answers
  • What are the characteristics of low energy waves
    8·1 answer
  • A plane has a cruising speed of 250 miles per hour when there is no wind. at this speed, the plane flew 300 miles with the wind
    11·1 answer
  • Considerando que você comece a caminhar em velocidade constante, inicialmente a 350 m de um ponto referencial escolhido. Você ca
    9·1 answer
  • When two or more elements chemically combine the result is?
    14·1 answer
  • Penny has two dogs: Fluffy (left) and Butch (right).
    11·2 answers
  • In a binary-star system that produces a nova, the white dwarf pulls matter from the companion star. The matter forms an accretio
    11·1 answer
  • In a position-time graph what does it mean when you return to 0? ASAP HELP PLEASE!
    11·1 answer
  • Which of the following is correct?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!