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3 years ago

9

A common design for a spotlight uses a lens and a mirror, combined with a gas-discharge lamp, to project a powerful parallel bea

m of light. Where are the lens and mirror positioned?

1 answer:

wel3 years ago

7 0

Answer:

Explanation:

For answer please see the image attached .

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7. A 400 kg cannon fires an 80 kg student at +15 m/s. At what velocity will

telo118 [61]

Answer:

?

Explanation:

6 0

3 years ago

The pin symbolizing the greenhand ffa degree is made of what type of metal and why

max2010maxim [7]

The Greenhand degree is for first year or freshmen high school students. To receive the Greenhand degree, affiliates must have acceptable plans for a Supervised Agricultural Experience Program (SAEP) and make evident knowledge of the principle, code of ethics, motto, salute emblem, official dress, and important dates in FFA history. The Greenhand degree pin is made out of bronze for its strength and stability or durability.

5 0

4 years ago

How much potential energy does a 40-N medicine ball gain when it is lifted 5 m?

777dan777 [17]

We know, Potential Energy = Force * Height
Here, F = 40 N
h = 5 m

Substitute their values,
U = 40 * 5
U = 200 J

In short, Your Answer would be Option A

Hope this helps!

6 0

3 years ago

The Kentucky Derby is held at the Churchill Downs track in Louisville, Kentucky. The track is one and one-quarter miles in lengt

Lera25 [3.4K]

Answer:

2.815 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

$s=ut+\frac{1}{2}at^2\\\Rightarrow 1609.34=16.58\times t+\frac{1}{2}\times 0.0105\times t^2\\\Rightarrow \\\Rightarrow 4.905t^2+16.58t-1609.34=0$

$t=\frac{-16.58+\sqrt{308.69254}}{0.0105},\:t=\frac{-16.58-\sqrt{308.69254}}{0.0105}\\\Rightarrow t=94.25, -3252\ s$

Time taken with the acceleration is 94.25 seconds

Time = Distance / Speed

$\text{Time}=\frac{1609.34}{16.58}\\\Rightarrow \text{Time}=97.065\ s$

Difference in time = 97.065-94.25 = 2.815 seconds

6 0

3 years ago

malcom is doing a wheely on his motorcycle and moving at 20 m/s with a momentum of 6000 kg m/s when he lays her down. The mass o

rodikova [14]

Answer:

110 kg

Explanation:

The momentum of the Malcom+motorcycle system is given by:

$p=(m+M)v$

where

(m+M) is the total mass of the system, with

m = mass of Malcom

M = 190 kg (mass of the motorcycle)

v = 20 m/s velocity

Since we know the momentum:

p = 6000 kg m/s

We can re-arrange the equation to find the mass of Malcom:

$m=\frac{p}{v}-M=\frac{6000 kg m/s}{20 m/s}-190 kg=110 kg$

3 0

3 years ago