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larisa [96]
4 years ago
10

Which of the following objects is usually the smallest?

Physics
2 answers:
Stels [109]4 years ago
8 0
I would say comet is the smallest  and the sun is the biggest 
Deffense [45]4 years ago
3 0

b. comets

Although comets appear very large when they are near the Sun because of the large dust cloud that follows behind them, they are actually the smallest of the objects listed.

Comets typically have a diameter of less than 6 miles, which is much smaller than the typical diameter of the other objects listed above.

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The fluid pressure 10 ft underwater is ____ the fluid pressure 5 ft underwater
quester [9]
5ft is two times the 10ft
5 0
3 years ago
Which elements are alkali metals and which are alkaline earth metals
Irina18 [472]

Answer:

ix chemical elements that comprise Group 2 of the periodic table

Explanation:

Calcium, Magnesium, Barium, Beryllium, Strontium, and Radium are alkaline earth metals.

8 0
3 years ago
A skateboarder shoots off a ramp with a velocity of 6.6 m/s, directed at an angle of 58 above the horizontal. The end of the ram
sweet-ann [11.9K]

Answer:

a) Maximum height reached above ground = 2.8 m

b) When he reaches maximum height he is 2 m far from end of the ramp.

Explanation:

a) We have equation of motion v²=u²+2as

   Considering vertical motion of skateboarder.  

   When he reaches maximum height,

          u = 6.6sin58 = 5.6 m/s

          a = -9.81 m/s²

          v = 0 m/s

  Substituting

         0²=5.6² + 2 x -9.81 x s

          s = 1.60 m

  Height above ground = 1.2 + 1.6 = 2.8 m

b) We have equation of motion v= u+at

   Considering vertical motion of skateboarder.  

   When he reaches maximum height,

          u = 6.6sin58 = 5.6 m/s

          a = -9.81 m/s²

          v = 0 m/s

  Substituting

         0= 5.6 - 9.81 x t

          t = 0.57s

  Now considering horizontal motion of skateboarder.  

  We have equation of motion s =ut + 0.5 at²

          u = 6.6cos58 = 3.50 m/s

          a = 0 m/s²

          t = 0.57  

  Substituting

         s =3.5 x 0.57 + 0.5 x 0 x 0.57²

         s = 2 m

  When he reaches maximum height he is 2 m far from end of the ramp.

8 0
4 years ago
Which has the greater momentum when moving?
Basile [38]
I assume there are choices to this question that you forgot to include. No matter, I could just lay out the concept so that you can understand the gist.

The best way to approach this is to know the definition of momentum. In physics, momentum is always defined in terms of equation. For momentum, it is the product of the mass and velocity. Therefore, any increase of these two parameters would promote greater momentum. The greater the mass paired with the faster the velocity, the greater the momentum.
7 0
3 years ago
3.12 ** To illustrate the use of a multistage rocket consider the following: (a) A certain rocket carries 60% of its initial mas
madreJ [45]

Answer:

0.916v_{ex}

Explanation:

A multistage rock is also known as a step rocket and it is a form of vehicle that can use more than a rocket stage. The rocket stage typically contains propellant as well as its engine. The final speed of the rocket can be estimated using the equation below:

v = v_{ex} ln(\frac{m_{o}}{0.4m_{o}}) = v_{ex}*ln(2.5) = v_{ex}*0.916 = 0.916v_{ex}

Therefore, the maximum speed of the rocket is 0.916v_{ex}

8 0
4 years ago
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