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4 years ago

Does every scientific investigation start with an observation

Physics

2 answers:

BARSIC [14]4 years ago

4 0

Yes,you have to see / make an observation in order to make a hypothesis on why you think that is happening.

seropon [69]4 years ago

3 0

A hypothesis should come first. An if...then statement

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All objects near the earths surface - regardless of size and weight - hhave the same force of gravityvacting on them.

masya89 [10]

Answer:

B. False

Explanation:

Not all objects near the earths surface - regardless of size and weight - have the same force of gravity on them.

4 0

3 years ago

n an object. one force is 3N to the east and the other force is 9n to the west. what is the net force acting on the object

cricket20 [7]

Answer:

-6N

Explanation:

The force to the east is acting in the positive x-direction therefore it is positive. The force to the east is in the negative x-direction therefore it is negative. The net force is just the sum of the two so 3-9=-6

4 0

2 years ago

A jet plane is launched from a catapult on an aircraft carrier. In 2.0 s it reaches a speed of 42 m/s at the end of the catapult

Dvinal [7]

Answer:

Explanation:

Given

time taken $t=2\ s$

Speed acquired in 2 sec $v=42\ m/s$

Here initial velocity is zero $u=0$

acceleration is the rate of change of velocity in a given time

$a=\frac{v-u}{t}$

$a=\frac{42-0}{2}=21\ m/s^2$

Distance travel in this time

$s=ut+0.5at^2$

where

s=displacement

u=initial velocity

a=acceleration

t=time

$s=0+\0.5\times 21\times (2)^2$

$s=42\ m$

so Jet Plane travels a distance of 42 m in 2 s

5 0

4 years ago

If the work put into a lever is 930 joules and the work accomplished is 870 joules, the efficiency of the lever is _____.

77julia77 [94]

♥ C) 94%
♥ If the work put into a lever is 930 joules and the work accomplished is 870 joules, the efficiency of the lever is 94%.
♥ <span>870/930=93.5
</span>♥ And rounded you get 94.

5 0

4 years ago

Read 2 more answers

PLEASE HELP The graph shows the amplitude of a passing wave over time in seconds (s). What is the approximate frequency of the w

d1i1m1o1n [39]

Answer:

$F = 0.3\ Hz$