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2 years ago

Which statement is true?

Physics

2 answers:

ratelena [41]2 years ago

8 0

Statement ' A ' is true.

sveta [45]2 years ago

4 0

Answer:

A.Speed is a scalar quantity and velocity is a vector quantity.

TRUE

Speed is the ratio of distance and time while velocity is the ratio of displacement and time

B.Speed and velocity are both scalar quantities.

FALSE

velocity is a vector quantity and it is ratio of displacement and time

C.Speed and velocity are both vector quantities.

FALSE

Speed is not a vector quantity but it is a scalar quantity

D.Speed is a vector quantity and velocity is a scalar quantity.

FALSE

Speed is scalar as it depends on distance while velocity is a vector which depends on displacement

E.Speed and velocity are neither a scalar quantity nor a vector quantity.

FALSE

Speed is scalar while velocity is vector

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Use the conservation of energy to explain the speeds at different places in the diagram of the roller coaster.

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Answer:

I just toughed it out and talked with friends

Explanation:

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2 years ago

A manometer is used to measure the air pressure in a tank. the fluid used has a specific gravity of 1.25, and the differential h

BartSMP [9]

Specific Gravity of the fluid = 1.25
Height h = 28 in
Atmospheric Pressure = 12.7 psia
Density of water = 62.4 lbm/ft^3 at 32F
Density of the Fluid = Specific Gravity of the fluid x Density of water = 1.25 x 62.4
Density of the Fluid p = 78 lbm/ft^3
Difference in pressure as we got the differential height, dP = p x g x h dP = (78 lbm/ft^3) x (32.174 ft/s^2) x (28/12 ft) [ 1 lbf / 32.174 ft/s^2] [1 ft^2 /
144in^2]
Difference in pressure = 1.26 psia
(a) Pressure in the arm that is at Higher
P = Atmospheric Pressure - Pressure difference = 12.7 - 1.26 = 11.44 psia
(b) Pressure in the tank that is at Lower
P = Atmospheric Pressure + Pressure difference = 12.7 + 1.26 = 13.96psia

4 0

3 years ago

An elevator and its load have a combined mass of 1650 kg. Find the tension in the supporting cable when the elevator, originally

gizmo_the_mogwai [7]

Answer:

Tension in the supporting cable is = 4,866 N ≅4.9 KN

Explanation:

First of all, we need to understand that tension is a force, so the motion law

F = Ma applies perfectly.

From Newtons third law of motion, action and reaction are equal and opposite. This means that the force experienced by the elevator, is equal to the tension experienced by the spring.

Parameters given:

Mass of load = 1650 kg

Acceleration of load = ?

The acceleration of the load can be obtained by diving the change in velocity by the time taken. But we need to know the time taken for the motion to 41 m.

Time taken = distance covered / velocity

= $\frac{41m}{11m/s}$ = 3.73 seconds

∴Acceleration = ( initial velocity - final velocity )/ time taken

Note: Final velocity is = 0 since the body came to a rest.

Acceleration = $\frac{11 - 0 m/s}{3.73s}$ = 2.95m/ $s^{2}$

Force acting on the cable = mass of elevator × acceleration of elevator

= 1650 × 2.95 = 4869.5 kg ≅ 4.9 KN

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2 years ago