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yuradex [85]
3 years ago
8

All of the following objects are moving at the same speed. which one bas the greatest kinetic energy? (remember kinetic energy d

epends on mass and speed)
a. car


b. semi tractor-trailer truck


c. motorcycle


d. bicycle
Physics
1 answer:
melomori [17]3 years ago
6 0

B, the semi-tractor trailer truck, since it has the most mass.

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What determines the amount of current which will flow through a battery while it is being charged by a constant voltage source?
blsea [12.9K]

Answer:

The state of charge of the battery.

Explanation:

The state of charge of the battery will determines the amount of current which will flow through a battery while it is being charged by a constant voltage source. A battery supplies electric power , battery is characterized by an equation with voltage and current variables.

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3 years ago
Two blocks of masses mA and mB are connected by a massless spring. The blocks are moved apart, stretching the spring, and subseq
WINSTONCH [101]

Answer:

Part a)

\frac{v_A}{v_B} = -\frac{m_B}{m_A}

Part b)

\frac{K_A}{K_B} = \frac{m_B}{m_A}

Explanation:

Part a)

As we know that initially the two blocks are connected by a spring and initially stretched by some amount

Since the two blocks are at rest initially so its initial momentum is zero

since there is no external force on this system so final momentum is also zero

m_Av_{1i} + m_Bv_{2i} = m_Av_A + m_Bv_B

now for initial position the speed is zero

0 = m_Av_A + m_Bv_B

now we have

\frac{v_A}{v_B} = -\frac{m_B}{m_A}

Part b)

now for ratio of kinetic energy we know that the relation between kinetic energy and momentum is given as

K = \frac{P^2}{2m}

now for the ratio of energy we have

\frac{K_A}{K_B} = \frac{P^2/2m_A}{P^2/2m_B}

since we know that momentum of two blocks are equal in magnitude so we have

now we have

\frac{K_A}{K_B} = \frac{m_B}{m_A}

7 0
3 years ago
The equilibrium constant for a given reaction... Group of answer choices always increases with temperature. increases with tempe
adell [148]

Explanation:In exothermic reactions, increase in temperature decreases the equilibrium constant, K, whereas, in endothermic reactions, increase in temperature increases the K

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A turntable that spins at a constant 80.0 rpmrpm takes 3.50 ss to reach this angular speed after it is turned on. Find its angul
Veronika [31]

Answer:

The angular acceleration is <u>2.39 rad/s²</u>.

The number of degrees it rotates is <u>841.68 degrees</u>.

Explanation:

Given:

Initial angular speed (ω₀) = 0 rad/s

Final angular speed in rpm (N) = 80.0 rpm

Time taken (t) = 3.50 s

First, let us determine the final angular speed in radians per second.

We know that,

\omega=\frac{2\pi N}{60}\ rad/s

Plug in the values and find the final angular speed, 'ω'. This gives,

\omega=\frac{2\pi\times 80.0}{60}=8.38\ rad/s

Now, using equation of motion for rotational motion, we have:

\omega=\omega_0+\alpha t\\\\\alpha\to angular\ acceleration

Plug in the given values and solve for α. This gives,

8.38=0+\alpha \times 3.50\\\\\alpha=\frac{8.38}{3.50}=2.39\ rad/s^2

Therefore, the angular acceleration is 2.39 rad/s².

Now, again using rotational equation of motion relating angular displacement, we have:

\omega^2=\omega_0^2+2\alpha\theta\\\\\theta=\frac{\omega^2-\omega_0^2}{2\alpha }

Plug in the given values and solve for 'θ'. This gives,

\theta=\frac{(8.38)^2-0}{2\times 2.39}\\\\\theta=\frac{70.2244}{4.78}=14.69\ rad

Convert radians to degrees using the conversion factor. This gives,

π radians = 180°

So, 1 radian =( 180 ÷ π ) degrees

Therefore, 14.69\ rad=14.69\times (\frac{180}{\pi})=841.68^\circ

So, the number of degrees it rotates is 841.68 degrees.

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3 years ago
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Answer:

C .96 meters

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