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tankabanditka [31]

3 years ago

8

If the mass of an object is 44 kilograms and its velocity is 10 meters per second east, how much Kinetic Energy does it have?

1 answer:

aksik [14]3 years ago

8 0

Answer: 2200J

Explanation:

M = 44kg

V = 10m/s

K.E =?

K.E = 1/2MV2 = 1/2 x 44 x (10)^2

K.E = 22 x 100

K.E = 2200J

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7. A car moving at 10m/s (about 22.4 mph) crashes into a barrier and stops in 0.25 m.

Galina-37 [17]

Answer:

a) 0.05s

b) 4000N

Explanation:

a)When car is stopped its final velocity become zero

U- 10 m/s

V- 0 m/s

S - 0.25 m

t -?

S = (v+u)*t/2

0.25 =(10+0)*t/2

t = 0.05s

b) If we happened to calculate the avarage force we have to consider about acceleration

V= 0

U = 10

t = 0.05 s

a =?

V = U + at

0 = 10 -a * 0.05

a = 200 m/s2

F = m *a

= 20 * 200

= 4000N

6 0

3 years ago

Suppose that you hear a clap of thunder 16 s after seeing the associated lightning strike. How far are you from the lightning st

riadik2000 [5.3K]

Answer:

$d=5.376km$

Explanation:

Since <em>light is so fast</em> we can assume no time passes between the lightning strikes and we observe it. We want to know then how far away did the strike occur for the sound to take 16s to reach our ears. Since the definition of velocity tells us that $v=d/t$ , we can write $d=vt=(336m/s)(16s)=5376m=5.376km$

4 0

3 years ago

A cat leaps to catch a bird. if the cat's jump was at 60.0° off the ground and its initial velocity was 2.74 m/s, what is the hi

user100 [1]

Answer:

0.29 m

Explanation:

7 0

3 years ago

Describe the difference between a conductor and an insulator in terms of thermal energy transfer and provide an example of each.

Nikitich [7]

The difference between conductors and insulators is because of electronic structure of atoms and molecules.

Anywhere we have free electrons, we have a hard conductor where free electrons help in conduction.

In electrolytes, charged Ions do conduction.

Dielectrics (or insulators) don't have free electrons current.

Free electrons mean, the electrons that are not related with a specific atom, they are allowed to move nearby the crystal lattice.

4 0

3 years ago

Calculate the difference in blood pressure between the feet and top of the head for a person who is 1.70 m tall.

cupoosta [38]

Answer:

$P_2 - P_1 = 1.8 * 10^4\ Pa$

Explanation:

Given

$Height (h) = 1.70m$

Required

Determine the difference in the blood pressure from feet to top

This is calculated using Pascal's second law.

The second law is represented as:

$P_2 = P_1 + pgd$

Subtract P1 from both sides

$P_2 - P_1 = pgd$

Where

$p = blood\ density = 1.06 * 10^3kg/m^3$

$g = acceleration\ of\ gravity = 9.8N/kg$

$d =height = 1.70m$

P2 - P1 = Blood Pressure Difference

So, the expression becomes:

$P_2 - P_1 = 1.06 * 10^3 * 9.8 * 1.70$

$P_2 - P_1 = 17659.6Pa$

$P_2 - P_1 = 1.8 * 10^4\ Pa$

Hence, the difference in blood pressure is approximately $1.8 * 10^4\ Pa$

3 0

3 years ago