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zzz [600]
3 years ago
6

True or false? Please help me !

Physics
1 answer:
liberstina [14]3 years ago
7 0

Answer:

They may not all be acurate

Explanation:

16. True (I think)

17.True

18.False (I think)

19.True

20.True

21.False

22.True

23. True

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When using water displacement to measure the volume of an irregularly shaped solid, like a rock, which of the following would be
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Three cubic centimeters
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3 years ago
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A homeowner is trying to move a stubborn rock from his yard. By using a a metal rod as a lever arm and a fulcrum (or pivot point
Nonamiya [84]

Answer:

1.52 m

Explanation:

We are given that

Maximum force=F=679 N

Mass of rock ,m=385 kg

Distance,d=0.233 m

We have to find the  minimum total length L of the rod required to move the rock.

Torque on rock=T_1=mgd=385\times 9.8\times 0.233=879.11 N

Where g=9.8m/s^2

Torque on man=T_2=Force\times distance=(L-d)\times 679=(L-0.233)\times 679

T_1=T_2

(L-0.233)\times 679=879.11

L-0.233=\frac{879.11}{679}=1.29

L=1.29+0.233=1.523\approx 1.52 m

Hence, the minimum total  length of rod=1.52 m

3 0
3 years ago
A rope swing is hung from a tree right at the edge of a small creek. The rope is 5.0 m long; the creek is 3.0 m wide.
irina [24]

Answer:

1) T = 4.5 s

2) T = 4.5 s

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Explanation:

We can use the equation

T = 2π√(L/g)

1) T = 2π√(5m/9.81 m/s²) = 4.5 s

2) T = 2π√(L/g)

T = 2π√(5m/9.81 m/s²) = 4.5 s

3) v = √(2gR)

v = √(2(9.81 m/s²)(5m))

v = 9.9 m/s

8 0
4 years ago
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At which point should a researcher inform the respondents about the use of deception in a psychological study ??
lbvjy [14]
D during the course of the study
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A car travels 50km east east in 30 min what is its velocity in km/h
Pie

Answer:

0.6

Explanation:

3 0
3 years ago
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