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3 years ago

1.what is matter?

Physics

1 answer:

MariettaO [177]3 years ago

7 0

1. Matter is anything that has mass and takes up space.
2. Electrons orbit around the nucleus.
3. protons and electrons

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If a ball is thrown vertically upward from the roof of 32 foot building with a velocity of 64 ft/sec, its height after t seconds

stepan [7]

Answer:

a) $s_{max} = 96\,ft$ , b) $v(4.449\,s) = -78.368\,\frac{ft}{s}$

Explanation:

a) The maximum height is obtained with the help of the First and Second Derivative Tests:

First Derivative

$v(t) = 64 - 32\cdot t$

$64 - 32\cdot t = 0$

$t = 2\,s$

Second Derivative

$a(t) = -32$ (absolute maximum)

The maximum height reached by the ball is:

$s (2\,s) = 32 + 64\cdot (2\,s) - 16\cdot (2\,s)^{2}$

$s_{max} = 96\,ft$

b) The time required by the ball to hit the ground is:

$32+64\cdot t - 16\cdot t^{2} = 0$

$-16\cdot (t^{2}-4\cdot t - 2) = 0$

$t^{2}-4\cdot t - 2 = 0$

$(t -4.449)\cdot (t+0.449)\approx 0$

Just one root offers a solution that is physically reasonable:

$t = 4.449\,s$

The velocity of the ball when it hits the ground is:

$v(4.449\,s) = 64 - 32\cdot (4.449\,s)$

$v(4.449\,s) = -78.368\,\frac{ft}{s}$

6 0

3 years ago

Read 2 more answers

An airplane is at rest on a runway. It accelerates at 10 m/s2 for 15 seconds. How fast is it now traveling?

KATRIN_1 [288]

Answer:

150

Explanation:

v = at

v = 10(15)

v = 150 m/s

6 0

4 years ago

For a freely falling object dropped from

vlada-n [284]

If you stay on or near the surface of Earth, then the acceleration due to gravity

is constant. It's 9.807 meters per second squared. (rounded)

7 0

3 years ago

A box is moved 2m across the floor with a force of 16n. How much work was done?

Nesterboy [21]

Answer:

Work done on the box = 32 J

Explanation:

Work done = Force x Displacement.

Force applied on the box = 16 N

Displacement of box = 2 meter.

Work done on the box = Force applied on the box x Displacement of box

= 16 x 2 = 32 Nm = 32 J

Work done on the box = 32 J

7 0

3 years ago

A bar of iron is 10 cm at 20°C. At 19°C it will be (are = 11 x 10-6/°C)

dangina [55]

Answer:

HENCE (3) IS ANSWER

Explanation:

α =ΔL/(LO×Δ T) or ΔL= α(LO×Δ T)

HERE ΔL IS CHANGE IN LENGTH, Lo is original length , α is coefficient of linear expansion , Δ T is change in temperature

α= 11 x 10 ^-6/°C , Δ T = 19-20 = -1°C

hence

ΔL= 11 x 10 ^-6×10×-1

= - 11×10^-5

MINUS SIGN SHOWS SHORTER

HENCE (3) IS ANSWER

4 0

3 years ago

Read 2 more answers