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nexus9112 [7]
3 years ago
10

An unspecified force causes a 0.20-kg object to accelerate at 0.40 m/s2. If 0.30 kg is added to the 0.20-kg object and the force

remains the same, what is the acceleration (in m/s2) of the heavier object? (NEVER include units with the answer to a numerical question.)
Physics
1 answer:
Naddik [55]3 years ago
4 0

Answer:

a = 0.16

Explanation:

given,

mass of the object 1 = 0.2 kg

mass of the object 2 = 0.3 kg

acceleration when force is on 0.2 kg = 0.4 m/s²

acceleration when both mass are combine = ?

F = m a

F = 0.2 × 0.4

F = 0.08 N

force acting is same and total mass  = 0.2 + 0.3 = 0.5 Kg

F = m a

a = \dfrac{F}{m}

a = \dfrac{0.08}{0.5}

a = 0.16 m/s²

the acceleration  acting when both the body is attached is a = 0.16

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A 900 kg car runs into a 70 kg deer at 28 m/s. If the car transfers all of its momentum to the deer, how fast does the deer go f
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Answer:

Mc = 900 Kg

Uc = 28 ms^-1

Md = 70 Kg

Ud = 0

We want Vd

Vc = Vd

This situation is elastic momentum

m _{c}u _{c}+ m _{d}u _{d} = m _{c}v _{c} + m _ dv _{d} \\  (900 \times 28) + (70 \times 0) = (900 \times v _{d} ) + (70 \times v _{d}) \\ 25200 = (900 + 70)v _{d}  \\ 25200 = 970v _{d} \\ v _{d} =  \frac{25200}{970}  \\ v _{d} = 26 \: m {s}^{ - 1}

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3 years ago
If your shirt is dyed so that it looks violet, which color of light is reflected by the dye?
Bad White [126]

Violet i took the test and it gave me the answer

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3 years ago
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A 3kg ball moving at 8 m/s strikes a 2kg ball at rest,if the collision is elastic,what is the speed of the lighter ball if the h
zloy xaker [14]

Answer:

Speed of lighter ball is 4 m/s.

Explanation:

Applying the principle of conservation of linear momentum,

momentum before collision = momentum after collision.

m_{1}u_{1} + m_{2} u_{2} = m_{1}v_{1} - m_{2}v_{2}

m_{1} = 3 kg, u_{1} = 8 m/s, m_{2} = 2 kg, u_{2} = 0 m/s ( since it is at rest), v_{1} = 2 m/s, v_{2} = ?

(3 x 8) + (2 x 0) = (8 x 2) - (2 x v_{2})

24 + 0 = 16 - 2v_{2}

2v_{2} = 16 - 24

2v_{2} = -8

v_{2} = \frac{-8}{2}

   = -4 m/s

This implies that the light ball moves at the speed of 4 m/s in the opposite direction of the heavier ball after collision.

7 0
3 years ago
What use do we have for motion diagrams?
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Answer:

A motion diagram represents the motion of an object by displaying its location at various equally spaced times on the same diagram. Motion diagrams are a pictorial description of an object's motion. They show an object's position and velocity initially and present several spots in the center of the diagram.

Explanation:

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4. A car of mass 2000 kg is traveling at 45 m/s when the driver spots a policeman anead. i ne univer apprivo
MariettaO [177]

Answer:

The change in the Kinetic Energy of the car, E = 1449000 joules

Explanation:

Given,

The mass of the car, m = 2000 Kg

The speed of the car, v = 45 m/s

The brake applied on the car for a duration, t = 3 s

The average force applied by the brake, F = 1.4 x 10⁴ N

The kinetic energy of the body is given by the relation,

                                     K.E = 1/2 mv²

The initial kinetic energy of the car,

                                   K.E = 0.5 x 2000 x 45

                                          = 2025000 J

The force applied by the brakes

                                   F = m x a

Therefore, the deceleration of the car

                                     a = F / m

                                        = 1.4 x 10⁴ / 2000

                                       = 7 m/s²

Using the first equations of motion,

                                 v = u + at

                                 v = 45 + (-7) (3)                      ∵  (-7 ) car is decelerating

                                  v =24 m/s

The final kinetic energy of the car

                                 k.e = 0.5 x 2000 x 24

                                        = 576000 J

The difference in the kinetic energy,

                           E = K.E - k.e

                               = 2025000 J - 576000 J

                               = 1449000 joules

Hence, the change in the Kinetic Energy of the car, E = 1449000 joules

3 0
3 years ago
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