If your friend said that to that kinetic energy was changing to potential emergy at point c, how would you respond

Physics

1 answer:

algol133 years ago

7 0

Answer:

I would tell them that they are wrong because at this point, the cannon ball just has potential energy.

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Gabriella got a burn on her arm from a chemical spill and rinsed the area thoroughly with water. Which piece of safety equipment

ioda

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3 years ago

Read 2 more answers

A student holds a bike wheel and starts it spinning with an initial angular speed of 9.0 rotations per second. The wheel is subj

KATRIN_1 [288]

Answer:

$\Delta t = 8 s$

Explanation:

As we know that the angular acceleration of the wheel due to friction is constant

so we can use kinematics

$\theta = \omega_i t + \frac{1}{2}\alpha t^2$

so we have

$(65 \times 2\pi) = (2\pi \times 9)(10) + \frac{1}{2}(\alpha)(10^2)$

$130\pi = 180\pi + 50 \alpha$

$\alpha = -\pi rad/s^2$

now time required to completely stop the wheel is given as

$\omega_f = \omega_i + \alpha t$

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$t = 18 s$

now time required to stop the wheel is given as

$\Delta t = 18 - 10$

$\Delta t = 8 s$

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3 years ago

A laser pointer used in a lecture hall emits light at 650 nm what is the frequency

Aleksandr-060686 [28]

<span>The formula for frequency is speed of light divided by wavelength. 650 nm represents the wavelength and 3x10^8 m/s is the speed of light. If you convert 650nm to meters you get 6.5x10^-7 m so you can divide using the formula above, giving you 4.6x10^14 1/s or Hz, the unit of frequency in Physics.</span>

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3 years ago

A person is making homemade ice cream. She exerts a force of magnitude 28 N on the free end of the crank handle on the ice-cream

Alecsey [184]

Answer:

$P = 43.2 Watt$