All categories

3 years ago

Physics !!!!!!!!!!!!!!

Physics

1 answer:

julsineya [31]3 years ago

4 0

Answer:

1) v = 0.49 m/s

2) v = 2.5 Km/h

Explanation:

1) Given,

Let the initial velocity of the dog and canoe be zero, hence the total momentum is also equal to zero.

The final velocity of the dog, v = 1.4 m/s

The mass of the dog, m = 16 Kg

The mass of the canoe, M = 45 Kg

The final velocity of the canoe, V = ?

According to the law of conservation of linear momentum,

Substituting the given values in the above equation

45 x V + 16 x 1.4 = 0

V = -22.4 / 45

V = -0.49 m/s

The negative sign indicates that the canoe moves in the direction opposite to that of dog

Hence the velocity of the canoe, V = 0.49 m/s

2) Given,

Let the mass of the person be 'm'

The mass of his buddy is also 'm'

The initial velocity of the person, u = 5 Km/h

The initial velocity of his buddy, U = 0

According to the laws of conservation of linear momentum,

Since the person holds onto the buddy, their final velocity is combined. Let it be 'v'

mu = 2mv

v = u/2

= 5 /2

= 2.5 Km/h

Hence, the combined velocity is, v = 2.5 Km/h

You might be interested in

A 30000 grams boy is riding a merry-go-round with a radius of 600 cm. What is the centripetal force and acceleration on the boy

irga5000 [103]

Answer:

centripetal force is calculated by mass(kg) × tangetial velocity(m/s) ÷ radius (m)

Explanation:

so 30000g= 30kg

50km/h = 13.88m/s

600cm= 6m

30×13.88÷6= 69.4N

N= Newton's

hope this helps.

btw I'm 16 and love physics so I tried my best in this hope it went well!!

7 0

3 years ago

A projectile is fired at an upward angle of 35.6° from the top of a 208-m-high cliff with a speed of 170-m/s. What will be its s

sdas [7]

Answer:

Final velocity is 181.61 m/s at angle 40.44° below horizontal.

Explanation:

Initial horizontal velocity = 170 cos 35.6 = 138.23 m/s

Final horizontal velocity = 138.23 m/s

Considering vertical motion of projectile:

Initial vertical velocity, u = 170 sin 35.6 = 98.96 m/s

Acceleration, a = -9.81 m/s²

Displacement, s = -208 m

We have v² = u² + 2as

Substituting

v² = 98.96² + 2 x -9.81 x -208

v = 117.79 m/s

Final velocity,

$v=\sqrt{138.23^2+117.79^2}=181.61m/s$

$\theta =tan^{-1}\left ( \frac{117.79}{138.23}\right )=40.44^0$

Final velocity is 181.61 m/s at angle 40.44° below horizontal.

5 0

4 years ago

How many neutrons is there in that element that has 36 protons and 36 electrons

bagirrra123 [75]

You need to know the mass number to work it out. I can see you have it but it's not visible on your photo.

Every proton weighs 1 and every neutron weighs 1 so if you know the total mass of the nucleus and the number of protons, then you can do:
Mass Number - Proton Number = Neutron Number
because the rest of the mass (that isn't from the protons) must come from the neutrons. Make sense?

3 0

3 years ago

A 200 g, 20 cm diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supp

Rama09 [41]

Answer: The torque required is 0.0471 N m.

Explanation:

Mass of the disc = 200 g = 0.2 kg (1 kg =1000 g)

Radius of the disc = $\frac{Diameter}{2}$ = 10 cm = 0.1 m(1 m = 100 cm)