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3 years ago

What is the impulse that a car with mass of 5kg experiences when its velocity changes from -9m/s to 25m/s?

Physics

2 answers:

Inessa05 [86]3 years ago

8 0

Idk!!
The answer is probably the last one because the other ones don’t seem right :)

Amiraneli [1.4K]3 years ago

4 0

Answer:

170 kg m/s

Explanation:

Impulse = change in momentum

J = m Δv

J = (5 kg) (25 m/s − (-9 m/s))

J = 170 kg m/s

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A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 41.5-gram mass is attached at the 28.5-cm

zzz [600]

Answer:

The value is $M = 42.3 \ kg$

Explanation:

From the question we are told that

The first position of the fulcrum is x = 49.7 cm

The mass attached is $m = 41.5 \ g$

The position of the attachment is $x_1 = 28.5 \ cm$

The second position of the fulcrum is $x_2 = 39.2 \ cm$

Generally the sum of clockwise torque = sum of anti - clockwise torque

$CWT = m (x_2 - x_1)$

Here CWT stands for clockwise torque

$ACWT = M ( x - x_2)$

$m (x_2 - x_1) = M ( x - x_2)$

=> $41.5 (39.2 - 28.5 ) = M ( 49.7 -39.2 )$

=> $M = 42.3 \ kg$

3 0

3 years ago

A large truck loaded with scrap Stella weights 14 metric tons and is traveling north on the interstate heading for Chicago. It h

cupoosta [38]

Momentum = (mass) x (speed)

Now that the truck, including its load of Stella, has stopped to refuel,
its speed relative to the pump is zero. So its momentum, relative to
the pump and everything else motionless with respect to the ground,
is

(14,000 kg) x (0) = zero .

6 0

4 years ago

The Carson family's pancake recipe uses 2 teaspoons of baking powder for every 1/3 of a teaspoon of salt. How much baking powder

melomori [17]

Answer:

6 teaspoons of baking powder required.

Explanation:

Given that

According to the recipe of pancake,

For every $\frac{1}{3}$ teaspoon of salt, 2 teaspoons of baking baking powder is required.

To find:

How much baking powder will be needed, if 1 teaspoon of salt was used ?

Solution:

This problem can be solved using ratio.

$\frac{1}3$ teaspoon of salt : 2 teaspoons of baking powder

Let us multiply the above ratio with 3.

$\frac{1}{3}\times 3$ teaspoon of salt : 2 $\times$ 3 teaspoons of baking powder

1 teaspoon of salt : 6 teaspoons of baking powder

So, answer is 6 teaspoons of baking powder required.

Also, we can use the unitary method:

$\frac{1}3$ teaspoon of salt needs = 2 teaspoons of baking powder

1 teaspoon of salt needs = $\frac{2}{\frac{1}3}$ teaspoons of baking powder

1 teaspoon of salt needs = 2 $\times$ 3 = 6 teaspoons of baking powder needed

So, the answer is:

6 teaspoons of baking powder required.

5 0

3 years ago

Read 2 more answers

What are the two most abundant elements in a main

kompoz [17]

I think answer should be d. Please give me brainlest let me know if it’s correct thanks I appreciate it

5 0

3 years ago

A 1.10 kg block is attached to a spring with spring constant 17 N/m. While the block is sitting at rest, a student hits it with

34kurt

Answer:

Explanation:

The kinetic energy of block will be converted into potential energy of spring .

If A be the amplitude of oscillations

1 /2 k A² = 1/2 m v²

17 A² = 1.1 x .46²

A² = .0137

A= 11.7 cm

B )

when x = .25 A = .25 x 11.7 = 2.9 cm

potential energy = 1/2 k x²

= .5 x 17 x ( .029 )² = .00715 J

kinetic energy = 1/2 m v²

1/2 m v² + .00715 = .5 1.1 x .46²

1/2 m v² + .00715 = .1164

1/2 m v² = .10925

.5 x 1.1 x v²= .10925

v² = .1986

v = .4456 m /s

= 44.56 cm /s

5 0

3 years ago