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3 years ago

How does Physics help you as a student?

Physics

2 answers:

Sonja [21]3 years ago

8 0

Answer:

The goal of physics is to understand how things work from first principles. ... Courses in physics reveal the mathematical beauty of the universe at scales ranging from subatomic to cosmological. Studying physics strengthens quantitative reasoning and problem solving skills that are valuable in areas beyond physics

Lana71 [14]3 years ago

7 0

Answer:

you get to understand why things happen this way

Explanation:

for example, are you not curious about why when standing in the bus and when the bus stops, you will might feel like you are going to fall ,

why does this happen because....

newton's laws explains it,

inertia causes you to be reluctant to change your initial state of motion due to your mass so you fall because you are still moving at the 'speed of the bus ' , something in like that

hope this helps,

please mark also

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3. A 500 kg car and a 1000 kg truck are both moving at 5 m/s.

Stels [109]

Answer:

The ratio of momentum is 1:2 since the velocity is constant and mass is of ratio 1:2

Explanation:

Given

mass of car $m_{car}$ = 500 kg

mass of truck $m_{truck}$ = 1000 kg

velocity of car = velocity of truck = v = 5 m/s

momentum of car $p_{car}$ = ?

momentum of truck $p_{truck}$ = ?

We know that the momentum is given by: p = mv , where m is mass and v is velocity.

momentum of car $p_{car}$ = $m_{car}$ x v = 500 x 5 = 2500 kg.m/s

momentum of truck $p_{truck}$ = $m_{truck}$ x v = 1000 x 5 = 5000 kg.m/s

The ratio of momentum = $\frac{p_{car}}{p_{truck}}$

= $\frac{2500}{5000}$

= $\frac{1}{2}$ = 1:2

Here we infer that the ratio is 1:2. This is because momentum value depends on mass and velocity of body. In given problem velocity is constant. Hence depends only on mass. The ratio of mass is 1:2 and so the ratio of momentum.

3 0

3 years ago

A car is traveling 11.4 m/s. A truck having four times the mass of the car is traveling at 22.7 m/s. How many times greater is t

Marta_Voda [28]

Sice the mass are four times the car the relationship between both is inverse so the kinetic is 4 times less

6 0

3 years ago

Two football players are pushing a 60 kg blocking sled across the field at a constant speed of 2.5 m/s. The coefficient of kinet

expeople1 [14]

Answer:

1.06 m

Explanation:

The kinetic friction of the grass on the sled is the product of friction coefficient and the normal force, which equals to gravitational force. Let g = 9.81 m/s2:

$F_f = \mu N = \mu mg = 0.3*60*9.81 = 176.58 N$

So the deceleration caused by kinetic friction on the 60 kg sled is

$a = F_f / m = 176.68 / 60 = 2.943 m/s^2$

If the sled on a speed of 2.5m/s and then subjected to a deceleration of 2.943 m/s2, then we can use the following equation of motion to find out the distance traveled by the sled before rest:

$v^2 - v_0^2 = 2a\Delta s$

where v = 0 m/s is the final velocity of the sled when it stops, $v_0$ = 2.5m/s is the initial velocity of the can when it hits, a = -2.943 m/s2 is the deceleration, and $\Delta s$ is the distance traveled, which we care looking for:

$0^2 - 2.5^2 = 2*2.943\Delta s$

$\Delta s = 2.5^2 / (2*2.943) = 1.06 m$

4 0

3 years ago

Read 2 more answers

On the earth, when an astronaut throws a 0.250-kg stone vertically upward, it returns to his hand a time T later. On planet X he

Pachacha [2.7K]

Answer:

d) g/2

Explanation:

We need to use one of Newton's equations of motion to find the position of the stone at any time t.

x(t) = x₀(t) + ut - ¹/₂at²

Where

x₀(t) = initial position of the stone.

x(t) - x₀(t) = distance traveled by the stone at any time.

u = initial velocity of the stone

a = acceleration of the stone

t = time taken

On both planets, before the stone was thrown by the astronaut, x = 0 and t = 0.

=> 0 = x₀(t)

=> x₀(t) = 0

On earth, when the stone returns into the hand of the astronaut at time T on earth, x = 0.

=> 0 = 0 + uT - ¹/₂gT² (a = g)

=> uT = ¹/₂gT²

=> g = 2u/T

On planet X, when the stone returns into the hand of the astronaut, time = 2T , x = 0.

=> 0 = 0 + u(2T) - ¹/₂a(2T)²

=> 2uT = 2aT²

=> a = u/T

By comparing we see that a = g/2.

5 0

4 years ago

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Gwar [14]

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3 years ago