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2 days ago

HELP ASAP! GIVING BRAINLIEST!

Physics

2 answers:

inna [987]2 days ago

8 0

Answer:

1. Emma on top of the mountain

As she remains still and is elevated above ground, her energy is attributed to gravitational potential energy.

Thus, we have

gravitational potential energy

$U = mgH$

2. Emma leaping off the mountain

During free fall, Emma begins to descend with increasing speed, which means she has

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

motion energy

3. tension in the rope at Emma's lowest point

As the rope stretches and reaches its lowest point causing her speed to drop to zero, the energy is converted entirely to elastic potential energy.

$U = \frac{1}{2}kx^2$

elastic potential energy

4. Emma rebounding

When she bounces back, she regains kinetic energy, moving upwards with some speed.

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

motion energy

Maru [1K]2 days ago

6 0

Answer:

1. Emma on top of the mountain

Being stationary at height results in energy derived from gravitational potential energy.

Thus, we have

gravitational potential energy

2. Emma jumping from the mountain

As she falls freely, Emma accelerates downwards gaining speed, thus exhibiting

motion energy

3. tension in the rope at Emma's lowest point

When the rope is stretched and her velocity reaches zero at the lowest point, the energy converts to elastic potential energy.

elastic potential energy

4. Emma bouncing upwards

Upon bouncing back, she again possesses kinetic energy as she moves upwards.

motion energy

Explanation:

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Three equal negative point charges are placed at three of the corners of a square of side d. What is the magnitude of the net el

Ostrovityanka [942]

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Regarding the field, the two charges placed opposite cancel each other out!
Therefore, E = kQ / d² = k * Q / (d/√2)² = 2*k*Q / d² ◄
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E = 1.789×10¹⁰ N·m²/C² * Q / d² </span>

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14 days ago

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A closed system of mass 10 kg undergoes a process during which there is energy transfer by work from the system of 0.147 kJ per

Softa [913]

Result: -50.005 kJ

Details:

Provided Data

mass of the system = 10 kg

work done = 0.147 kJ/kg

Elevation change $(\Delta h)=-50 m$

initial speed $(v_1)=15 m/s$

Final Speed $(v_2)=30 m/s$

Specific internal Energy $(\Delta U)=-5 kJ/kg$

according to the first Law of thermodynamics

$Q-W=\Delta H$

$\Delta H=\Delta KE+ \Delta PE +\Delta U$

where KE represents kinetic energy

PE indicates potential energy

U denotes internal Energy

$\Delta H=\frac{m(v_2^2-v_1^2)}{2}+mg(\Delta h)+\Delta U$

$Q=W+\Delta KE+ \Delta PE +\Delta U$

$Q=0.147\times 10+\frac{10\cdot (30^2-15^2)}{2}+10\cdot 9.81\cdot (-5)-5\times 10$

Q = 1.47 + 3.375 - 4.850 - 50

Q = -50.005 kJ

5 0

13 days ago

A mouse runs along a baseboard in your house. The mouse's position as a function of time is given by x(t)=pt2+qt, with p = 0.36

ValentinkaMS [1149]

Response:

0.60 m/s

Details:

The average speed between times t = a and t = b can be expressed as:

v_avg = (x(b) − x(a)) / (b − a)

Given the function x(t) = 0.36t² − 1.20t, and considering the interval from 1.0 to 4.0:

v_avg = (x(4.0) − x(1.0)) / (4.0 − 1.0)

v_avg = [(0.36(4.0)² − 1.20(4.0)) − (0.36(1.0)² − 1.20(1.0))] / 3.0

v_avg = [(5.76 − 4.8) − (0.36 − 1.20)] / 3.0

v_avg = [0.96 − (-0.84)] / 3.0

v_avg = 0.60

The average speed calculated is 0.60 m/s.

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12 days ago

State two advantages of a lead-acid accumulator over a leclanche cell

kicyunya [1025]

Respuesta:

Se pueden recargar.

Poseen una vida útil mayor.

Son reutilizables.

Explicación:

Las baterías de plomo-ácido y las pilas Leclanché son tipos de células electroquímicas.

Las pilas Leclanché son células primarias. Estas células producen reacciones químicas que generan corriente eléctrica de manera irreversible.

Por su parte, las baterías de plomo-ácido son células secundarias que permiten la reversibilidad de la corriente eléctrica generada.

Esto hace que las baterías de plomo-ácido sean reutilizables, con mayor durabilidad y un tiempo de vida más prolongado.

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16 days ago

When 999mm is added to 100m ______ is the result

Keith_Richards [1034]

Answer:

The outcome of adding 999mm to 100m is 101m.

Explanation:

That's my belief.

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5 days ago

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