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3 years ago

Define vector quantity giving examples

Physics

1 answer:

vladimir2022 [97]3 years ago

8 0

Answer:

Quantity with direction and magnitude

Displacement

Explanation:

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A 5.0 kg wooden block is placed at an adjustable inclined plane. what is the angle of incline above which the block will start t

Aleks [24]

The value of the angle of the incline $\theta$ at which the block starts to slide is the angle at which the component of the weight parallel to the incline becomes equal to the frictional force that keeps the block on the incline:
$mg \sin \theta = \mu N$
where the term on the left is the component of the weight parallel to the incline, and the term on the right is the frictional force, which is the product between the coefficient of friction $\mu$ and the normal reaction of the incline N.

The normal reaction of the incline, N, is equal to the component of the weight perpendicular to the incline:
$N=mg \cos \theta$
Therefore, the initial equation becomes
$mg \sin \theta = \mu mg \cos \theta$
From which we find
$\tan \theta = \mu$
$\theta = \arctan \mu$

For angles above this value, the block will start sliding down, otherwise the block will stay on the incline.

3 0

3 years ago

A 2000-kg car moving with a speed of 20 m/s collides with and sticks to a 1500-kg car at rest at a stop sign. Show that because

amid [387]

Answer:

13.33m/s

Explanation:

Given data

m1= 2000kg

u1= 20m/s

m2= 1500kg

u2= 0m/s

v1= 10m/s

Required

The speed of the sticks

We know that from the expression for the conservation of momentum

m1u1+m2u2= m1v1+m2v2

2000*20+1500*0=2000*10+1500*v2

40000=20000+1500v2

collect like terms

40000-20000= 1500v2

20000= 1500v2

v2= 20000/1500

v2= 13.33 m/s

Hence the velocity of the sticks is 13.33m/s

8 0

3 years ago

Mixing salt in water is an example of physical change

galina1969 [7]

EXPLAIN MORE!!! i need more detail if i can help you

6 0

3 years ago

7. How much thermal energy is absorbed when 10.0 g of ice at 0.0 degrees C changes phase to liquid water at 0.0 degrees C? The m

Nesterboy [21]

Answer:

3.34 kJ

Explanation:

FIrst of all, we need to calculate the number of moles corresponding to 10.0g of ice. This is given by

$n=\frac{m }{M_m}$

where

$M_m = 18.02 g/mol$ is the molar mas

m = 10.0 g is the mass

Substituting

$n=\frac{m}{M_m}=\frac{10 g}{18.02 g/mol}=0.555 mol$

Now we know that the heat of fusion is

$H_{fus}=6.01 kJ/mol$

so the thermal energy needed to fuse the ice is

$Q=n H_{fus} = (0.555 mol)(6.01 kJ/mol)=3.34 kJ$

6 0

3 years ago

Two spheres are made of wood - the first is a variety of wood whose density is equal to that of water, while the second is of a

ki77a [65]

Answer:

The buoyant force experienced by a body is equal to product of unit weight of liguid in which the the objevt is immersed and the volume of liquid replaced by the object.

In the given scenario, bothe the spheres have equal volume and are fully submerged in water. Therefore, the buoyant force experienced by both the spheres will be equal.

5 0

4 years ago

Define vector quantity giving examples​

Define vector quantity giving examples