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3 years ago

Experiments and investigations must be ____. a. approved b. repeatable c. not reproducible d. accepted

Physics

2 answers:

deff fn [24]3 years ago

7 0

Experiments and investigations must be B. Repeatable.

Dovator [93]3 years ago

5 0

<span>Experiments and investigations must be repeatable. Good experiments allow other fellow researchers to replicate or repeat the studies to examine whether they will create similar results. Such results will further support any theory or hypothesis being questioned. The opposite may also be true, namely the repeating of the experiment may oppose the previous results and put into question the original experiment.</span>

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A 4812 kg boulder sits on top of a 203 m cliff. What is its PE?

Bond [772]

Answer:

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 9.8 m/s²

From the question we have

PE = 4812 × 9.8 × 203

We have the final answer as

Hope this helps you

7 0

3 years ago

A body of mass 70kg climbed a hill 1000m high. calculate the maximum energy gained by the body.

stellarik [79]

Potential energy = mgh

So, energy gained

= mgh

= 70kg × (9.8m/s²) × 1000m

= 686000 kgm²/s²

= 686000 J

3 0

3 years ago

You stand on a balcony and throw a bouncy ball upwards with 7.2 J of kinetic energy the ball has 8.3 J of gravitational potentia

11111nata11111 [884]

Answer:

15.5 J

Explanation:

The total (mechanical) energy of an object is given by

E = K + U

where

K is the kinetic energy

U is the gravitational potential energy

The ball in the problem, when it left the hand, has:

K = 7.2 J (kinetic energy)

U = 8.3 J (potential energy)

So, its total mechanical energy is

E = 7.2 + 8.3 = 15.5 J

8 0

4 years ago

A cylindrical rod of steel (E = 207 GPa, 30 × 10 6 psi) having a yield strength of 310 MPa (45,000 psi) is to be subjected to a

Yanka [14]

Answer:

Diameter of the cylinder will be $d=2.998\times 10^4m$

Explanation:

We have given young's modulus of steel $E=207GPa=207\times 10^9Pa$

Change in length $\Delta l=0.38mm$

Length of rod $l=500mm$

Load F = 11100 KN

Strain is given by $strain=\frac{\Delta l}{l}=\frac{0.38}{500}=7.6\times 10^{-4}$

We know that young's modulus $E=\frac{stress}{strain}$

So $207\times 10^9=\frac{stress}{7.6\times 10^{-4}}$

$stress=1573.2\times 10^{-5}N/m^2$

We know that stress $=\frac{force}{artea }$

So $1573.2\times 10^{-5}=\frac{11100\times 1000}{area}$

$area=7.055\times 10^{8}m^2$

So $\frac{\pi }{4}d^2=7.055\times 10^{8}$

$d=2.998\times 10^4m$

6 0

3 years ago

What physical property causes you to lean to one side when the bus you are traveling in takes a sharp turn

umka21 [38]

The answer would be Inertia. Inertia is the tendency for an object to stay at its state of motion. Newton's 2nd law states that that an object in motion tends to stay in motion unless an external force acts upon it.

7 0

3 years ago