PHYSICS HIGH SCHOOL

A block has a volume of 0.09 m3 and a density of 4,000 kg/m3. What's the force of gravity acting on theblock in water?
A. 3,038 N
B. 882 N
C. 2,646 N
D. 3,528 N

Answers

Answer 1
Answer: density = (mass) / (volume)
4,000 kg/m³ = (mass) / (0.09 m³)
(4,000 kg/m³) x (0.09 m³) = mass
mass = 360 kg 
force of gravity = (mass) x (acceleration of gravity) = (360 kg) x (9.8 m/s²) = (360 x 9.8)  kg-m/s² =   3,528 newtons .  

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You are asked to contemplate the concepts of oscillation and periodic motion (or periodic behavior). These lead to the definition of a special kind of periodic motion called simple harmonic motion. For now, let's just think about periodicity (1) and oscillations for the following two scenarios. Your answers will not be marked for correctness. Scenario 1: The motion of the second hand on a clock is:_______
a. periodic but not oscillatory (I.e. the hand does not oscillate or undergo oscillations).
b. periodic and also oscillatory.
c. not periodic and not oscillatory.
d. oscillatory but not periodic.
Scenario 2: The motion of a person rocking back and forth on a rocking chair to the beat of a song is:_______
a. periodic but not oscillatory.
b. periodic and also oscillatory.
c. not periodic and not oscillatory.
d. oscillatory but not periodic.
Please explain why your answers for the two scenarios are either the same or different. Your answer should include brief definitions of periodic and oscillatory (or oscillations).

Answers

Answer:

The correct answers are

a. periodic but not oscillatory (I.e. the hand does not oscillate or undergo oscillations).

b. periodic and also oscillatory.

Explanation:

Oscillatory motion are motion that involves the repeated forward and backward motion of an object or mater between two position, points or states. An oscillatory motion that repeats itself at a regular interval or cycle is a periodic oscillatory motion. Examples of periodic oscillatory motion includes, a pendulum, the upward and downward motion of a weighted spring or a sine wave

while periodic motion is the repeated movement of an object over a specific period of time. The period is the time for the motion to repeat itself measure in seconds.

The motion of the hand of the clock is periodic as it revolves round every minute, but it is in a clockwise direction hence it is not oscillatory

while the motion f a person rocking back and forth on a rocking chair to the beat of a song is periodic and oscillatory

How do I calculate the equivalent resistance?

Answers

you need to specify between which nodes.

Rab = R1+R5+R3 ; R2,R4 are ignored because CD is opened curcuit.

Rbd = R3 + R4

anyway, the cuircuit seems incomplete
Sęòhs hadoí jdaló, 2jò

Harnessing the sun's energy to produce heat or electricity is _____.. A. non-polluting . B.inexpensive . C. possible only in coastal areas. D. a mojor source of air pollution.

Answers

harnessing the sun's energy to produce heat or electricity is : A. Non - Polluting

This energy generating method will cause no dangerous emission for environment (unlike the one that came from fossil fuel), but the energy that produced from the sun tend to be more expensive so it's still not widely used

hope this helps
Harnessing the sun's energy to produce heat or electricity is _____.

Answer: Out of all the options shown above the one that completes the statement above and makes it true is answer choice A. non-polluting. This is called solar power which is also a renewable resource.

I hope it helps, Regards.

Wood is an example of a fossil fuel.User: The type of energy stored by fossil fuels such as coal is
a. kinetic energy.
b. mechanical energy.
c. chemical potential energy.
d. electromagnetic energy.
User: An example of a fossil fuel is
a. wood.
b. petroleum.
c. the sun.
d. water.

Answers

a.kinetic energy for it an example of wood.

Answer:

a

Explanation:

A bowl contained 19.1 grams of salt. Then, Kaitlin poured in another 77.49 grams. How much salt does the bowl contain now?

Answers

the bowl contains 96.59 grams now :)

Maria throws an apple vertically upward from a height of 1.3 m with an initial velocity of +2.8 m/s. Will the apple reach a friend in a tree house 5.9 m above the ground? The acceleration due to gravity is 9.81 m/s 21. No, the apple will reach 5.27136 m below the tree house2. Yes, the apple will reach 5.27136 m above the tree house3. No, the apple will reach 1.43117 m below the tree house4. No, the apple will reach 1.5289 m below5. Yes, the apple will reach 1.5289 m above the tree house6. Yes, the apple will reach 1.43117 m above the tree house

Answers

Answer:

No, the apple will reach 4.20041 m below the tree house.

Explanation:

t = Time taken

u = Initial velocity = 2.8 m/s

v = Final velocity = 0

s = Displacement

g = Acceleration due to gravity = -9.81 m/s² = a (negative as it is going up)

Equation of motion

v^2-u^2=2as\n\Rightarrow s=(v^2-u^2)/(2a)\n\Rightarrow s=(0^2-2.8^2)/(2* -9.81)\n\Rightarrow s=0.39959\ m

The height to which the apple above the point of release will reach is 0.39959 m

From the ground the distance will be 1.3+0.39959 = 1.69959 m

Distance from the tree house = 5.9-1.69959 = 4.20041 m

No, the apple will reach 4.20041 m below the tree house.

The values in the option do not reflect the answer.

Final answer:

The apple will not reach the friend in the tree house as it will only reach a height of approximately 1.527 m.

Explanation:

To determine whether the apple will reach a friend in a tree house 5.9 m above the ground, we can use the equations of motion. Since the apple is thrown vertically upward, it will experience a negative acceleration due to gravity. Using the equation h = vo*t + (1/2)*a*t^2, where h is the final height, vo is the initial velocity, a is the acceleration, and t is the time, we can calculate the time it takes for the apple to reach a height of 5.9 m. Plugging in the values, we get:

5.9 = 2.8*t + (1/2)*(-9.81)*t^2

Simplifying the equation, we have:

-4.905*t^2 + 2.8*t - 5.9 = 0

Using the quadratic formula, we can solve for t. The quadratic formula is t = (-b ± sqrt(b^2 - 4ac)) / (2a), where a = -4.905, b = 2.8, and c = -5.9.

Plugging in the values, we get:

t = (-2.8 ± sqrt(2.8^2 - 4*(-4.905)*(-5.9))) / (2*(-4.905))

After evaluating the formula, we find that the apple will take approximately 1.527 seconds to reach a height of 5.9 m. Since the apple continues to rise after reaching this height, it will not reach the friend in the tree house.
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