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3 years ago

What is the weight of a 45 kg box? N

Physics

2 answers:

Aleks04 [339]3 years ago

7 0

45 kg * 9.8 m/s^2 = <u>441 N.</u>

3241004551 [841]3 years ago

7 0

Answer:

The force of a mass's weight is defined as its mass * acceleration due to gravity.

On Earth, g is about 9.8 m/s^2. This will be the acceleration due to gravity.

Then, 45 kg * 9.8 m/s^2 = 441 N.

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Seeing a police officer ahead and not being sure of the speed limit, a driver slows from 65 mi/hr to 55 mi/hr in 4.0 seconds, tr

Flauer [41]

Answer:

$-1.13 m/s^2$

Explanation:

The acceleration of the car is given by:

$a=\frac{v-u}{t}$

where

v is the final velocity

u is the initial velocity

t is the time

Here we have to convert the velocities from mi/hr to m/s. Keeping in mind that

1 mi = 1609 m

1 h = 3600 s

We get:

$u = 65 mi/h \cdot \frac{1609}{3600}=29.1 m/s\\v = 55 mi/h \cdot \frac{1609}{3600}=24.6 m/s$

While the time interval is

t = 4.0 s

Substituting,

$a=\frac{24.6 - 29.1}{4.0}=-1.13 m/s^2$

3 0

3 years ago

Two point charges are fixed on the y axis a negative point charge q1-26 μC at y1 = +0.21 m and a positive point charge q2 art y2

11111nata11111 [884]

Answer:

$3.13\times 10^{-5} C$

Explanation:

We are given that

$q_1=26\mu C=26\times 10^{-6} C$

$1\mu C=10^{-6} C$

$y_1=0.21 m$

$q=8.1\mu C=8.1\times 10^{-6} C$

$y_2=0.39 m$

F=28 N

We have to find the magnitude of q2.

We know that

$F=\frac{kq_1q_2}{r^2}$

Where $k=9\times 10^9$

Using the formula

Force on charge q due to charge q1

$F_1=\frac{9\times 10^9\times 26\times 10^{-6}\times 8.1\times 10^{-6}}{(0.21)^2}$

$F_1=42.98 N$

Force on charge q due to point charge q2

$F_2=\frac{9\times 10^9\times q_2\times 8.1\times 10^{-6}}{(0.39)^2}$

$F_2=4.79\times 10^5 q_2$

$F=F_1-F_2$

$28=42.98-4.79\times 10^5q_2$

$4.79\times 10^5q_2=42.98-28=14.98$

$q_2=\frac{14.98}{4.79\times 10^5}=3.13\times 10^{-5} C$

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3 years ago

Suppose a 225 kg motorcycle is heading toward a hill at a speed of 29 m/s. The two wheels weigh 12 kg each and are each annular

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Answer:

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a solution with a pH of 2.0 is strongly acidic

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