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
vova2212 [387]
3 years ago
14

Thermal energy transfers from a cup of tea at 350 K to the hand holding it. A)True B)False

Physics
1 answer:
Alexandra [31]3 years ago
6 0

Answer:

true

Explanation:

it is an energy transfer

You might be interested in
Scientists use this part of the electromagnetic spectrum to diagnose broken bones. X–rays infrared waves gamma rays ultraviolet
Snezhnost [94]

X-rays are used to identify broken bones


4 0
3 years ago
Read 2 more answers
Twin​ brothers, Andy and​ Brian, can mow their​ grandparents lawn together in 1212 minutes. Brian would mow the lawn by himself
Karo-lina-s [1.5K]

Answer:

It will take Andy 1.198minutes to mow the lawn and it will take Brian 1,209.98minutes to mow the same lawn.

Step-by-step explanation:

Using the simultaneous equation concept, let A denote Andy and B be Brian

Andy and Brian can mow the lawn for 1212minutes i.e A+B = 1212..eqn 1

If Brian would mow the lawn by himself in 1010 minutes more than it would take Andy, this means B=1010A...eqn 2.

Substituting eqn 2 into eqn 1

Equation 1 becomes

A+1010A=1212

1011A=1212

A=1212/1011

A=1.198

B = 1010×1.198

B=1,209.98

Therefore, It will take Andy 1.198minutes to mow the lawn and it will take Brian 1,209.98minutes to mow the same lawn.

6 0
3 years ago
Any of two or more forms of the same element which differ only in the number of neutrons their atoms contain is called an
telo118 [61]
C. isotope

Isotopes have the same atomic number but different mass number because of the difference in the number of neutrons in the nucleus of the atom.
8 0
3 years ago
A bowler throws a bowling ball of radius R = 11.0 cm down the lane with initial speed = 8.50 m/s. The ball is thrown in such a w
Ad libitum [116K]

Answer:

a) 1.18 seconds

b) 8.6 m

c) 5.19 revolutions

d) 6.07 m/s

Explanation:

<u>Step 1: </u>Data given

radius of the ball = 11.0 cm

Initial speed of the ball = 8.50 m/s

The coefficient of kinetic friction between the ball and the lane is 0.210.

<em></em>

<em>(a) For what length of time does the ball skid?</em>

The velocity at time t can be written as v(t) = v0 + at

 ⇒ with v(t) = the velocity at time t

⇒ with v0 : the initial velocity = 8.50 m/s

⇒ with a = the acceleration (in m/s²)

   ⇒The acceleration (negative) due to friction: a = -µg

           ⇒ with µ = 0.210

          ⇒ with g = 9.81 m/s²

v(t) =8.5m/s - 0.21*9.81m/s² * t = 8.5 - 2.06t

Torque τ = Iα = (2m(0.11m)²/5)α = 0.00484m*α

τ = F * r = µm*g*R = 0.21 * M * 9.81m/s² * 0.11m = 0.227m

so α = 0.227m / 0.00484m = 46.9 rad/s²

angular velocity ω(t) = ωo + αt = 0 + 46.9 rad/s² * t

The ball stops sliding when v(t) = ω(t) * r

8.5 - 2.06t  = 46.9*0.11*t = 5.159t

7.219t = 8.5

<u>t = 1.18 seconds</u>

<em>b) How far down the lane does it skid?</em>

s = Vo*t + ½at² = 8.5m/s * 1.18s - ½* 2.06 m/s² * (1.18s)² = <u>8.6 m</u>

<em>c) How many revolutions does it make before it starts to roll?</em>

The angular acceleration of the ball is:

α =  τ/I

 ⇒ with  τ = the torque experienced by the ball due the frictional force

   ⇒  τ = fk*R

α = fk*R /I

 ⇒ I = 2/5 m*R²

 ⇒ fk = µk*m*g

α = (µk*m*g*R)/(2/5mR²)

α = 5µk*g /2R

The angular displacement of the ball is:

∅ = 1/2αt²

⇒ The ball does not have an initial angular velocity

∅ =1/2*(5µk*g/2)*t²

∅ = 5µkgt²/4R

∅ = (5*0.21*9.81*1.18²)/(4*11.0 *10^-2)

∅ = 32.6 rad

Number of revolutions = 32.6 rad /2π

<u>Number of revolutions = 5.19</u>

<em>(d) How fast is it moving when it starts to roll?</em>

v = Vo + at = 8.5m/s - 2.06m/s² * 1.18s = <u>6.07 m/s</u>

7 0
3 years ago
If an automobile airbag inflates in 25 µs, what is the time in seconds?
kotegsom [21]
That is 19 seconds cuz of the fast inplosion
7 0
3 years ago
Other questions:
  • I WIIL GIVE BRAINLIEST
    11·1 answer
  • Please answer these questions for me! I am giving MAX points! Brainliest!
    11·2 answers
  • The number of electrons with the number of protons in a charged object
    8·1 answer
  • A friend asks you how much pressure is in your car tires. You know that the tire manufacturer recommends 30 psi, but it's been a
    9·1 answer
  • A car travels at a constant velocity of 20.0 meters/second for 15 seconds. What is the power of the car if the initial force app
    15·2 answers
  • A carrot hangs from the ceiling by a rope,
    10·2 answers
  • An ideal monatomic gas initially has a temperature of 300 K and a pressure of 5.79 atm. It is to expand from volume 420 cm3 to v
    12·1 answer
  • When a 12 N horizontal force is applied to a box on a horizontal tabletop, the box remains at rest. The force of friction acting
    5·1 answer
  • Why solar panels are usually painted black​
    10·1 answer
  • What type of reaction is below?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!