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3 years ago

A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its

Physics

1 answer:

fredd [130]3 years ago

6 0

The average acceleration of the cart is $4.75 m/s^2$

Explanation:

The acceleration of an object is given by

$a=\frac{v-u}{t}$

where

v is the final velocity of the object

u is the initial velocity

t is the time elapsed

For the roller coaster cart in the problem, we have:

u = 5 m/s is the initial velocity

v = 24 m/s is the final velocity

t = 4 s is the time elapsed

Solving the equation, we find the acceleration:

$a=\frac{24-5}{4}=4.75 m/s^2$

Learn more about acceleration:

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What is the focal length of a lens?

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The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm). In the case of zoom lenses, both the minimum and maximum focal lengths are stated, for example 18–55 mm.

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3 years ago

What is a metallic bond and how does it hold metals together?

Marysya12 [62]

Answer:

Force that holds atoms together in a metallic substance.

Explanation:

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2 years ago

12. A cross-country race car driver sets out on a 1.00 hour, 100.0 km race. At the halfway marker

Akimi4 [234]

Answer:

A.) Time = 0.625 hrs = 37.5 minutes

B.) Speed required = 133.33km/hr

Explanation:

Given the following :

Total race distance = 100km

Total time required = 1 hour = 60 minutes

Average speed after traveling 50km = 80km/hr

80km/hr : This means it will take one hour to cover a distance of 80km

Therefore, time taken to cove first 50km at that average speed equals :

1 hour = 80 km

t hours = 50km

80t = 50

t = 50/80

t = 5/8 hours

t = 0.625hours

t = 0.625 * 60 = 37.5minutes

Average speed required to complete the race in 1 hour = 100km/hr

Time used to complete first 50km = 0.625 hour

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3 years ago

A 54 kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. The acceleration of

Marizza181 [45]

Answer:

$h_{B} = 5.012\, m$

Explanation:

It is assumed that pole vaulter began running at a height of zero. The physical model is formed after the Principle of Energy Conservation:

$K_{A} = K_{B} + U_{B}$

$\frac{1}{2} \cdot m \cdot v_{A}^{2} = \frac{1}{2} \cdot m \cdot v_{B}^{2} + m \cdot g \cdot h_{B}$

The previous expression is simplified and required height is found:

$h_{B} = \frac{1}{2\cdot g} \cdot (v_{A}^{2}-v_{B}^{2})$

$h_{B} = \frac{1}{2 \cdot (9.807\, \frac{m}{s^{2}} )} \cdot [(10\, \frac{m}{s} )^{2}-(1.3\, \frac{m}{s} )^{2}]$

$h_{B} = 5.012\, m$

5 0

3 years ago

Most of the mass in an atom is in the nucleus.<br> True<br> False

Zanzabum

There are "Protons" & "Neutrons" in an atom inside the nucleus. They are very massive as compared to "Electrons" (which reside outside the nucleus).So, the sentence is correct.

In short, Your Final answer would be "True"

Hope this helps!

7 0

4 years ago

Read 2 more answers