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4 years ago

Which of the following are equivalent unit?

Physics

1 answer:

vodomira [7]4 years ago

5 0

Watt and Newton couldn't be simply because Newton is a force and Watt is a power.

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A movie stunt performer is filming a scene where he swings across a river on a vine. The safety crew must use a vine with enough

Julli [10]

Answer:

1125.66956 N

Explanation:

m = Mass of stunt performer

g = Acceleration due to gravity = 9.81 m/s²

v = Velocity of the swing = 7 m/s

T = Tension

r = Radius of the swing = Length of vine = 11.5 m

From the free body diagram

$T-mg-m\frac{v^2}{r}=0\\\Rightarrow T=mg+m\frac{v^2}{r}\\\Rightarrow T=m(g+\frac{v^2}{r})\\\Rightarrow T=80(9.81+\frac{7^2}{11.5})\\\Rightarrow T=1125.66956\ N$

The minimum tension force the vine must be able to support without breaking is 1125.66956 N

7 0

3 years ago

In a cold pack, an ___________ reaction draws heat from the surroundings. A. exothermic B. endothermic C. exergonic

elena-s [515]

In a cold pack, an endothermic reaction draws heat from the surroundings, although there are several different types of cold packs, some with different reactions.

8 0

4 years ago

Read 2 more answers

According to Newton's Brd Law, an object's momentum depends on it's velocity and mass, 4 dog-sled teams

Kryger [21]

Answer:

Team A has the greatest momentum

Explanation:

The momentum of an object is a vector quantity given by

$p=mv$

where

m is the mass of the object

v is its velocity

In this problem, we have to compare the momenta of the different sleds.

We have:

A) Sled Team A 48 kg moving at 10m/s:

m = 48 kg

v = 10 m/s

p = (48)(10) = 480 kg m/s

B) Sled Team B 14 kg moving at 18m/s

m = 14 kg

v = 18 m/s

p = (14)(18) = 252 kg m/s

C) Sled Team C 28 kg moving at 12m/s

m = 28 kg

v = 12 m/s

p = (28)(12) = 336 kg m/s

D) Sled Team D 22 kg moving at 12m/s

m = 22 kg

v = 12 m/s

p = (22)(12) = 264 kg m/s

So, team A has the greatest momentum.

4 0

3 years ago

What kind of motion happens at the atomic/molecular level of ALL solids, liquids and gases?

gayaneshka [121]

The answer is kinetic motion

6 0

4 years ago

A 10- kg ball starting from rest rolls down a 5 m tall smooth hill from one person to another person who is standing at the bott

olya-2409 [2.1K]

Answer: 3.13 m

Explanation:

Given

mas of the ball is m=10 kg

The ball rolls down a vertical distance of 5 m

Spring constant of spring is $k=100\ N/m$

Here, the potential energy of the ball converted into kinetic energy which in turn converts into elastic potential energy

$\Rightarrow mgh=\frac{1}{2}kx^2\quad [\text{x=compression in the spring}]\\\\\Rightarrow 10\times 9.8\times 5=\frac{1}{2}\cdot 100\cdot x^2\\\Rightarrow x=\sqrt{9.8}\\\Rightarrow x=3.13\ m$

Thus, the spring compresses by 3.13 m.

6 0

3 years ago