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2 years ago

A blue puck has a velocity of 3i –4j m/s. Its mass is 20 kg. What is its momentum?

Physics

2 answers:

damaskus [11]2 years ago

6 0

P = m * v
v = {3i - 4j} = square root (3^2 + 4^2) = 5
P = 20 * 5
P = 100 kg m/s

Tom [10]2 years ago

3 0

Magnitude:

√(3² + 4²) = √(9 + 16) = √25 = 5

Momentum = (mass) x (velocity) = (20kg x 5m/s) = 100 kg-m/s

Direction:

3i - 4j is in the direction tan⁻¹(-4/3) = 53.1 south of east.

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2 years ago

If a satellite is orbiting the Earth in elliptical motion, then it will move _______________ (slowest, fastest) when its closest

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1 year ago

A radar used to detect the presence of aircraft receives a pulse that has reflected off an object 5 ✕ 10−5 s after it was transm

Sunny_sXe [5.5K]

Answer:

7500 m

Explanation:

The radar emits an electromagnetic wave that travels towards the object and then it is reflected back to the radar.

We can call L the distance between the radar and the object; this means that the electromagnetic wave travels twice this distance, so

d = 2L

In a time of

$t=5\cdot 10^{-5}s$

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$c=3.0\cdot 10^8 m/s$

Since the electromagnetic wave travels with constant speed, we can use the equation for uniform motion ,so:

$d=vt$ (1)

where

$v=c=3.0\cdot 10^8 m/s$

$t=5\cdot 10^{-5}s$

$d=2L$ , where L is the distance between the radar and the object

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7 0

2 years ago

You run due east at a constant speed of 3.00 m/s for a distance of 120.0 m and then continue running east at a constant speed of

Leni [432]

Answer:

Explanation:

Given

Speed while running towards east is $v_1=3\ m/s$

Distance traveled in east direction $x_1=120\ m$

For Another interval you run with velocity

$v_2=5\ m/s$

$x_2=240\ m$

Total displacement $=x_1+x_2$

$=120+120=240\ m$

Time for first interval

$t_1=\frac{x_1}{v_1}=\frac{120}{3}$

$t_1=\frac{120}{3}=40\ s$

Time for second interval

$t_2=\frac{x_2}{v_2}=\frac{120}{5}=24\ s$

total time $t=t_1+t_2$

$t=40+24=64\ s$

average velocity $v_{avg}=\frac{x_1+x_2}{t}$

$v_{avg}=\frac{240}{64}=3.75\ m/s$

Therefore average velocity is less than $4 m/s$

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2 years ago