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3 years ago

12

A helium balloon is tied to a top-pan balance. A metal block of mass 100 g is placed on the balance. The reading on the balance

is 91 g. Which statement can be deduced from this experiment?

1 answer:

natima [27]3 years ago

3 0

Answer:

The resultant downward force on the top-pan balance is 0.91N.

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What is an analogy of two different roads or rivers to compare a series and parallel circuit?

faltersainse [42]

Answer:

In a series circuit, the same amount of current flows through all the components placed in it. On the other hand, in parallel circuits, the components are placed in parallel with each other due to which the circuit splits the current flow.

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2 years ago

Which motions are the components of projectile motion?

UkoKoshka [18]

Projectile motion contains both horizontal and vertical motion.

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3 years ago

Read 2 more answers

A helicopter is rising straight up. the height of a helicopter above the ground is given by h = 3.50t3, where h is in meters and

allochka39001 [22]

First, we need to calculate for the height where the mailbag was dropped.

h = 3.50 * t^3

at t = 1.75 s, h is:

h = 3.50 * (1.75)^3

h = 18.758 m

Then we can use the equation to solve for time:

h = v0t + 0.5gt^2

where v0 is initial velocity = 0, t = time, g = acceleration due to gravity

18.758 m = 0 + 0.5 * (9.81 m/s^2) * t^2

t^2 = 3.8242

t = 1.96 s

<span>So the mailbag reaches the ground after 1.96 seconds</span>

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3 years ago

Question 4. Calculate the kinetic energy of a Year 11 pupil (mass 55Kg)

bogdanovich [222]

Answer:

990 J

Explanation:

Kinetic energy is:

KE = ½ mv²

Given m = 55 kg and v = 6 m/s:

KE = ½ (55 kg) (6 m/s)²

KE = 990 J

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3 years ago

Curtis, a student in our class, makes the following statement: The puck reached a slightly higher location on the ramp than I pr

Sindrei [870]

Answer and Explanation: No, the explanation is not plausible. The puck sliding on the ice is an example of the <u>Principle</u> <u>of</u> <u>Conservation</u> <u>of</u> <u>Energy</u>, which can be enunciated as "total energy of a system is constant. It can be changed or transferred but the total is always the same".

When a player hit the pluck, it starts to move, gaining kinetic energy (K). As it goes up a ramp, kinetic energy decreases and potential energy (P) increases until it reaches its maximum. When potential energy is maximum, kinetic energy is zero and vice-versa.

So, at the beginning of the movement the puck only has kinetic energy. At the end, it gains potential energy until its maximum.

The representation is as followed:

$K_{i}+P_{i}=K_{f}+P_{f}$

$K_{i}+0=0+P_{f}$

$\frac{1}{2}mv^{2} = mgh$

As we noticed, mass of the object can be cancelled from the equation, making height be:

$h=\frac{v^{2}}{2g}$

So, the height the puck reaches depends on velocity and acceleration due to gravity, not mass of the puck.

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3 years ago