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fomenos
3 years ago
13

A child pushes his younger brother with 54 newtons of force, causing him to accelerate at 3.8 m/s/s. Assuming no friction, what

is the mass of the younger brother?
Answer to one decimal.
Physics
1 answer:
Sergeeva-Olga [200]3 years ago
4 0

Answer:

force normal = mass times acceleration

F=ma

54= m (3.8)

divide by 3.8 in both sides

54/3.8

mass of the little brother is 14.2 kg

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A train travels due south at 20 m/s. It reverses its direction and travels due north at 20 m/s. What is the change in velocity o
luda_lava [24]

Answer:

40 m/s due north

Explanation:

Consider that the south direction a negative Y axis and north direction as  + Y axis

v1 = 20 m/s South = 20 (-j) m/s

v2 = 20 m/s North = 20 j m/s

Change in velocity = v2 - v1 = 20 j - 20 (-j) = 40 j m/s

So, change in velocity is 40 m/s due north.

5 0
3 years ago
An explosion occurs 34 km away. the time it takes for its sound to reach your ears, traveling at 340 m/s, is
Murrr4er [49]
Let's convert the distance in meters first:
d=34 km=34000 m=3.4 \cdot 10^4 m
The sound wave travels at speed 
v=340 m/s
So we can use the basic relationship between space, time and velocity to calculate the time it takes for the sound to reach our ears:
t= \frac{S}{v}= \frac{3.4 \cdot 10^4 m}{340 m/s}=100 s
3 0
3 years ago
On April 15, 1999, a South Korean cargo plane crashed due to a confusion over units. The plane was to fly from Shanghai, China,
sattari [20]

Answer:

993 m or 3257 ft

Explanation:

The captain was told to fly at at 1500 ft altitude. At the rate of 3.28 ft to 1 m, this is

\dfrac{1500}{3.28}=457 metres.

Since he was at 1450 m, he thought he was above the correct altitude by

1450 - 457 = 993 m.

In feet, this is

993 * 3.28 = 3257 ft

6 0
4 years ago
4. What two terms are sometimes used to indicate opposite directions from a point?
ivolga24 [154]
<h2><em>What two terms are sometimes used to indicate opposite directions from a point?</em></h2>

  • <em>The terms <u>positive and negative</u> can be useful when giving opposite directions from a reference point.</em>

<em>hope </em><em>it</em><em> helps</em>

<em>#</em><em>c</em><em>a</em><em>r</em><em>r</em><em>y</em><em> </em><em>on</em><em> learning</em>

8 0
3 years ago
What is the kinetic energy of a 145 g baseball moving at 42 m/s?
klio [65]
Answer:
Kinetic energy = 127.89 Joules

Explanation:
Kinetic energy is calculated using the following rule:
KE = (1/2)*v* v^2
Where:
m is the mass = 145 g = 0.145 kg
v is the velocity = 42 m/sec

Substitute in the above equation to get the kinetic energy as follows:
KE = (0.5)(0.145)(42)^2
Kinetic energy = 127.89 Joules

Hope this helps :)
8 0
3 years ago
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