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3 years ago

Which of the following is a mixture: a. air c. water b. salt d. sulfur

1 answer:

3 0

A. Air because is composed of different elements such as nitrogen, oxygen, water vapor, carbon dioxide, sulfur, argon and many others.

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When the force at the ends of a bar pushes rather than pulls, the bar experiences?

Mariulka [41]

Answer:

I don't know sorry hopefully I can help with something else tho

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2 years ago

Two identical twins hold on to a rope, one at each end, on a smooth, frictionless ice surface. They skate in a circle about the

777dan777 [17]

Answer:

Part a)

$L = 2683.2 kg m^2/s$

Part b)

$v' = 8.60 m/s$

Part c)

$W = 4326.7 J$

Explanation:

Part a)

As we know that there is no external torque on the system of two twins

so here we will use

$L = mv r + mvr$

$L = 2(78 \times 4.30 \times 4)$

$L = 2683.2 kg m^2/s$

Part b)

Since angular momentum is conserved here as there is no external torque

so we will have

$2(m v r) = 2( m v' \frac{r}{2})$

$v' = 2v$

$v' = 8.60 m/s$

Part c)

Work done by both of them = change in kinetic energy

so we have

$W = 2(\frac{1}{2}mv'^2 - \frac{1}{2}mv^2)$

$W = m(v'^2 - v^2)$

$W = 78(8.60^2 - 4.3^2)$

$W = 4326.7 J$

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2 years ago

A driver traveling at 85. miles per hour sees a police car hiding in the trees 2.00 miles ahead. He applies his brakes, decelera

Nina [5.8K]

Answer: learn how to do your own work

Explanation:

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2 years ago

List two things phytoplankton need to survive. Name at least two special adaptations phytoplankton have to stay in the photic zo

cluponka [151]

They need water and sunlight to survive

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3 years ago

A rod of propoer length l0 is at rest in frame S'. it ilies in the x',y' plane and amkes an angle of sin^-1(3/5) What must be th

Blizzard [7]

Answer:

v = 1.98*10^8 m/s

Explanation:

Given:

- Rod at rest in S' frame

- makes an angle Q = sin^-1 (3/5) in reference frame S'

- makes an angle of 45 degree in frame S

Find:

What must be the value of v if as measured in S the rod is at a 45 degree)

Solution:

- In reference frame S'

x' component = L*cos(Q)

y' component = L*sin(Q)

- Apply length contraction to convert projected S' frame lengths to S frame:

x component = L*cos(Q) / γ (Length contraction)

y component = L*sin(Q) (No motion)

- If the rod is at angle 45° to the x axis, as measured in F, then the x and y components must be equal:

L*sin(Q) = L*cos(Q) / γ

Given: γ = c / sqrt(c^2 - v^2)

c / sqrt(c^2 - v^2) = cot(Q)

1 - (v/c)^2 = tan(Q)

v = c*sqrt( 1 - tan^2 (Q))

For the case when Q = sin^-1 (3/5)::

tan(Q) = 3/4

v = c*sqrt( 1 - (3/4)^2)

v = c*sqrt(7) / 4 = 1.98*10^8 m/s

5 0

2 years ago