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4 years ago

How far does a runner travel if they maintain a speed of 9.5 m/s for 140s?

1 answer:

5 0

Bruh just multiply 9.5 by 140 because if he runs for 140 seconds and runs 9.5 meters per second then he runs 9 meters per second

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A 60.0-kg man stands at one end of a 20.0-kg uniform 10.0-m long board. How far from the man is the center of mass of the man-bo

timama [110]

Answer:

x=1.25m

Explanation:

The <em>Center of mass </em>of the system is defined as the point where whole mass of the body is appeared to be concentrated.

The center of mass of the system is given by

x= $\frac{m1x1+m2x2}{m1+m2}$

where m1 is mass of man =60 kg

m2 mass of board =20 kg

let the man be at the origin x1 =0 , x2 =5m

by substituting in above formula

x = $\frac{(60*0)+(20*5)}{60+20}$ = $\frac{100}{80}$ =1.25 m

x=1.25m

So the center of mass of the system is at 1.25 m from man.

6 0

4 years ago

Read 2 more answers

How does an inclined plane work? A A small input force is exerted over a long distance. B A large output force is exerted over a

zavuch27 [327]

An inclined plane, just like all simple machines, makes work easier. I think it is a type of simple machines. Therefore, I think the best answer is A.

6 0

3 years ago

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average forc

elena-14-01-66 [18.8K]

Answer:4.259 kN

Explanation:

Given

mass of bullet $m=0.02 kg$

final velocity of bullet $v=575 m/s$

time taken $=2.7 ms\approx 2.7\times 10^{-3} s$

We know

$Impulse=F_{avg}\cdot t=change\ in\ momentum$

thus

Initial Momentum $(P_i)=m\times 0$

Final Momentum $(P_f)=m\times v=0.02\times 575$

$P_f=11.5 kg-m/s$

$F_{avg}\times 2.7\times 10^{-3}=P_f-P_i=11.5$

$F_{avg}=4.259\times 10^3$

$F_{avg}=4.259 kN$

7 0

3 years ago

Convert 150,000mm to km

Gwar [14]

.15 km. It goes in this way from largest to least: Kilometers, Hectometers, decameters, meters, decimeters, centimeters, and finally millimeters. When you are going up in measures you move the decimal point one space to the left for each measure you pass. It is vice-versa for going down these measures plz mark brainliest.

5 0

4 years ago

You are told to walk due east for 50 paces, then 30 degrees north of east for 38 paces, and then due south for 30 paces. What is

Tom [10]

Answer:

$\vec d_t=\ paces$

Explanation:

<u>Displacement</u>

It's a vectorial magnitude to measure the linear space between two points, It's usually computed as the subtraction of the final point minus the initial point. To find the sum of a sequence of displacements, we must sum the vectors.

In this problem, we see the 'pace' as a unit of length. We'll use it without attempting to convert it to any other standard unit. We'll also assume the positive direction to be east and north in both axes x,y respectively.

The first displacement is 50 paces due east. Let's assume the object starts from the origin (0,0)

Since the displacement is due east, the vertical component is zero, so

$\vec d_1=$