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spayn [35]
3 years ago
7

True or false. Students with a Learners License may not receive a motorcycle endorsement.

Physics
1 answer:
viktelen [127]3 years ago
3 0
This is a true statement 
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You need to know the height of a tower, butdarkness obscures the ceiling. You note thata pendulum extending from the ceiling alm
AysviL [449]

Answer:

The towers height is 322m  

Explanation:

We can assume that a simple pendulum hangs from the top of the tower.  

In this case, the length of the pendulum will be the same as the height of the tower.

We will use the next expression then:

T=(2pi)(\sqrt{L/g})

Where T is the period, L is the pendulum length and g is the gravity (9.81m/s^2)

From the previous expression we will have then that the length will be:

L=(g)*((T/2pi)^2)

Replacing:

L=(9.81m/s^2)*((36s/2pi)^2)

The towers height will be then: 322m

8 0
3 years ago
A machinist turns the power on to a grinding wheel, which is at rest at time t = 0.00 s. The wheel accelerates uniformly for 10
sashaice [31]

Answer:

Time interval;Δt ≈ 37 seconds

Explanation:

We are given;

Angular deceleration;α = -1.6 rad/s²

Initial angular velocity;ω_i = 59 rad/s

Final angular velocity;ω_f = 0 rad/s

Now, the formula to calculate the acceleration would be gotten from;

α = Change in angular velocity/time interval

Thus; α = Δω/Δt = (ω_f - ω_i)/Δt

So, α = (ω_f - ω_i)/Δt

Making Δt the subject, we have;

Δt = (ω_f - ω_i)/α

Plugging in the relevant values to obtain;

Δt = (0 - 59)/(-1.6)

Δt = -59/-1.6

Δt = 36.875 seconds ≈ 37 seconds

6 0
4 years ago
Why did scientists using classical, Newtonian physics have difficulty explaining the photoelectric effect?
alexandr402 [8]
Classical physics considered light to behave as a wave in all environments; it had a set amplitude, frequency etc. The problem was that this meant that there was a continuous variation in its properties, hence if the amplitude of the light was incresed by a bit, a phenomenon like the phhotoelectric one would become only marginally more apparent. However, in this case, there is a cutoff point which means that the only-wave theory had to be wrong.
3 0
3 years ago
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Calculate the centripetal force (in N) on the end of a 44 m (radius) wind turbine blade that is rotating at 0.7 rev/s. Assume th
Andrews [41]
Hmmm ummm hhhhmmmm uhhhhmmmmmmmmmmmm hmmmm
4 0
3 years ago
Read 2 more answers
If a substance can be separated by physical means and looks the same throughout what is it?
Gnom [1K]
A homogenous mixture is a mixture that is uniform throughout and can be separated by physical means. An example of which is the blood where its composition is uniformly mixed throughout but it can be separated by centrifugation, a physical means using the speed of rotation. Here, the denser particles are forced to settle in the bottom and the lighter particles stay at the top when rotated quickly.  
7 0
4 years ago
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