3 years ago

Who's really good at physical science?

Physics

1 answer:

34kurt3 years ago

3 0

Definitely not me!!!! (unless it's magnetism or circuits)

You might be interested in

A vehicle travels from a 30m marker to a 100m marker. What is the change in distance

alexgriva [62]

70 meters is your answer

Note that the beginning is the 30 meter mark, and the ending is the 100 meter mark. Subtract the beginning amount from the end:

100 - 30 = 70

The vehicle traveled 70 meters.

8 0

3 years ago

At the local playground, a 21-kg child sits on the right end of a horizontal teeter-totter, 1.8 m from the pivot point. On the l

Alja [10]

Answer:

Counterclockwise

Explanation:

We need to calculate the clocwkise and the counterclockwise torque.

The clockwise torque is the one generated by the child sitting on the right. This torque is given by:

$M_C = F d$

where

$F=mg=(21 kg)(9.8 m/s^2)=205.8 N$ is the force exerted by the child (his weight)

d = 1.8 m is the distance from the pivot point

So, the clockwise torque is

$M_C = (205.8 N)(1.8 m)=370.4 Nm$

The counterclockwise torque is the one generated by the adult pushing on the left, and it is given by

$M_A = F d$

where

F = 151 N is the force applied

d = 3.0 m is the distance from the pivot

Substituting,

$M_A = (151 N)(3.0 m)=453 Nm$

So, the net torque is

$M_A - M_C = 453 Nm - 370.4 Nm=82.6 Nm$

And since the counterclockwise momentum is greater than the clockwise one, the teeter-totter will rotate counterclockwise.

3 0

3 years ago

Read 2 more answers

Seasonal changes in water temperature tend to remain within a narrow range. This is opposed to air temperature, which tends to f

Serjik [45]

It is because of the high specific heat of water.

Specific heat is the amount of heat needed to change the temperature of unit mass of a substance by one degree.

Specific heat of water is 4.186 kJ/kg K and that of air is 1 kJ/kg K. Thus, a given amount of heat will cause more change in the temperature of air than that of water.

5 0

3 years ago

Read 2 more answers

Select the correct answer. A car is moving at a constant speed along a straight line. Which statement is true about the forces a

agasfer [191]

Answer:

i think try theanswer

Explanation:

proper

7 0

3 years ago

Read 2 more answers

Iodine molecules separates into atoms after absorbing light of 450 nm. If one

OlgaM077 [116]

Answer:E = hc/? = 4.41 x 10-19 J

Energy absorbed by each atom :

E (atom) = 2.205 x 10-19 J

Now Bond Energy of each molecule (B) = 3.98 x J

So, for each atom 1.99 x 10-19 J

So now

KE of each atom = E(atom) - B (atom)

= 2.15 x 10-19 J

5 0

3 years ago