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olchik [2.2K]
3 years ago
14

A small model of a pump is tested in the laboratory and found to have a specific speed, nsd, equal to 1000 when operating at pea

k efficiency. predict the discharge of a larger, geometrically similar pump operating at peak efficiency at a speed of 1800 rpm across an actual head rise of 200 feet.
Physics
1 answer:
abruzzese [7]3 years ago
4 0
What are the choices

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If the radius of the earth was suddenly tripled and its mass doubled, the surface gravitational acceleration would become: A) 9.
Mars2501 [29]

Answer:

B) 2.18 m/s²

Explanation:

M = Original mass of earth

R = Original radius of earth

g = original acceleration due to gravity of earth = 9.8 m/s²

M' = New mass of earth = 2 M

R' = New radius of earth = 3 R

g = original acceleration due to gravity of earth = 9.8 m/s²

Original acceleration due to gravity of earth is given as

g=\frac{GM}{R^{2}}

9.8 =\frac{GM}{R^{2}}                               eq-1

g' = new acceleration due to gravity of earth

New acceleration due to gravity of earth is given as

g' =\frac{GM'}{R'^{2}}

g' =\frac{G(2M)}{(3R)^{2}}

g'=\left ( \frac{2}{9} \right )\frac{GM}{R^{2}}

Using eq-1

g'=\left ( \frac{2}{9} \right )(9.8)

g' = 2.18 m/s²

8 0
3 years ago
What two forces act on falling bodies?
Alex Ar [27]

The two forces are: Air resistance and gravity.

7 0
3 years ago
A ball is tossed with enough speed straight up so that it is in the air several seconds. Assume upward direction is positive and
Viefleur [7K]

Answer:

Answer:

The velocity of the ball when it reaches its highest point is  0

Explanation:

The velocity of the ball when it reaches its highest point is 0

Once the ball is tossed into the air, as it goes up, the initial velocity with which it was thrown, reduces, as the motion of the ball is hindered by several forces such as gravity and air resistance. This slows down the velocity of the ball, up until it reaches a point, where the upwards velocity of the ball becomes zero. at this point, the ball begins to fall back to the ground.

6 0
3 years ago
Elias serves a volleyball at a velocity of 16 m/s. The mass of the volleyball is 0.27 kg. What is the height of the volleyball a
givi [52]
Hello! The anwser is 2.7! I hope this helps! ^^
4 0
3 years ago
Read 2 more answers
A uniform soda can of mass 0.140 kg is 12.0 cm tall and filled with 0.354 kg of soda (Fig. 9-41). Then small holes are drilled i
Ugo [173]

Answer:

Explanation:

a ) The centre of mass of a can filled completely with any liquid of any mass lies at the center of the can or at height h /2 where h is height of the can . So centre of mass of can of mass .140 kg of height 12 cm will lie at height 6 cm . Similarly center of mass of its content will also lie at height 6 cm that is center  point of the content .

Hence overall center of mass of can along with its content will lie at height 6 cm initially  .

b )

After the can loses all the soda , can becomes empty . Hence its center of mass will lie at its center again  .

c ) Its center of mass remains unchanged as the soda drains out completely .

d ) When soda starts draining out of the can , its lower part becomes heavier than the upper part . Hence its center of mass moves downwards . Its height is lowered . As height of soda is lowered in the can , center of mass also is lowered . It reaches its lowest point when soda in the can reaches half the height or when the can is half filled .

After that center of mass again starts rising upwards until the can is completely empty .

3 0
2 years ago
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