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3 years ago

50

Physics

2 answers:

kaheart [24]3 years ago

8 0

Answer: el pepe

Explanation:

sergiy2304 [10]3 years ago

5 0

Answer:

8125 N.

Explanation:

F = M A

M is mass

A is acceleration

F = 65 X 25

F = 8125 N.

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A stress of 210 MPa is applied to a low-carbon steel with an elastic modulus of 211 GPa. After the stress is applied and then re

Katen [24]

Answer:

Total strain when the stress was equal to 210 MPa = 0.101

Explanation:

See attached pictures.

3 0

3 years ago

PART ONE

Arte-miy333 [17]

Explanation:

Pressure = force / area

P = (68 kg × 9.8 m/s²) / (2 × (0.04 m)²)

P = 208,250 Pa

Converting to psi:

P = 208,250 N/m² × (0.225 lbf/N) × (0.0254 m/in)²

P = 30.2 psi

4 0

4 years ago

When a sound source is moving toward the observer, the observer will hear a higher pitch. This is due to

Goryan [66]

Number one a and b are automatically out if you decrease the pitch or frequency you wont hear it louder it does not add up ok?
number 2 the answer would be C the higher the frequency the higher the pitch the lower the frequency the lower the pitch this just comes back to common sense. for example you cant decrease the frequency and than expect a louder pitch its like saying I am going to smash the key on this piano with all my strength and it will make a small very low pitch sound you get what I mean so your answer would indeed be C.

5 0

3 years ago

Read 2 more answers

A heavy rocket ship and a light rocket ship are both initially moving at 1000 kilometers per hour in outer space. They are very

cestrela7 [59]

Answer:Both will continue traveling at the same speed because there is no friction.

Explanation: Gravitational force or pull is the force acting to attract all object in and around the Earth to the center of the Earth. The Earth's Gravitational force acts as a Bar magnet.

When objects are working outside the impact of the force of Gravity,it will not matter whether the objects are of the same size or wether one is heavier than the other,in this case both objects will move at the same speed as there is no impact of the Force of Gravity.

8 0

4 years ago

A 2.0-N force acts horizontally on a 10-N block that is initially at rest on a horizontal surface. The coefficient of static fri

Nady [450]

Answer:

None of the statement is false - all of them are true

Explanation:

Let's analyze each statement:

- The net force on the block is zero newtons. --> TRUE. In fact, the block is moving across the surface at constant speed: constant speed means zero acceleration, and according to Newton's second law,

F = ma

this also means a net force of zero newtons.

- The frictional force on the block has magnitude 3.0 N. --> TRUE. The horizontal acceleration of the block is zero, so the resultant of the horizontal forces must be zero:

$F-F_f = 0$

where F = 3.0 N is the horizontal push and $F_f$ is the frictional force. From the equation, we find

$F_f = F = 3.0 N$

- The coefficient of kinetic friction between the block and the surface is 0.30. --> TRUE. The frictional force is 3.0 N, and its expression is

$F_f = \mu_k (mg)$

where $\mu_k$ is the coefficient of kinetic friction and (mg)=10 N is the weight of the block. Solving for $\mu_k$ , we find

$\mu_k = \frac{F_f}{mg}=\frac{3 N}{10 N}=0.30$

- The direction of the total force that the surface exerts on the block is vertically upward. --> TRUE. Since gravity is acting downward, and the block is not accelerating on the vertical direction neither, there must be an equal and opposite force acting upward on the block: and this force is the force exerted by the surface on the block.

- The block is not accelerated. --> TRUE: the block is moving at constant speed, so its acceleration is zero.

7 0

4 years ago