A book is sitting on a table until I decide I needed more room sol pushed it 2 points

A cat runs and jumps from one roof top to another which is 7.22 meters away and 5.97 meters below. Calculate the minimum horizon

liraira [26]

Height of one roof is 5.97 m below the other roof

now its displacement in vertical direction is given as

$y = v_i t + \frac{1}{2} at^2$

$5.97 = 0 + \frac{1}{2}\times 9.8 (t^2)$

solving above for time

$t = 1.10 s$

now in the same time cat has to cover the distance between two buildings

so here we can say

$d = v_x \times t$

$7.22 = v_x \times 1.10$

solving above for speed

$v_x = 6.54 m/s$

so speed of cat is 6.54 m/s

8 0

4 years ago

If a student leaves 100-w lightbulb on In his room for 1 h, how many kilowatt-hour of electricity does the bulb use?

Anettt [7]

1) 0.1 kWh

Explanation:

The power of the lightbulb is:

$P = 100 W=0.1 kW$

The energy used by the lightbulb is equal to the product between the power (P) and the time (t):

$E=Pt$

Since the bulb has been left on for t = 1 h, the total electrical energy used is

$E=Pt=(0.1 kW)(1 h)=0.1 kWh$

2) $ 0.018

Explanation:

The company charges $0.18 per each kilowatt-hour. So, we can find the total cost charged for using 0.1 kWh of electricity by setting the following proportion:

$0.18 : 1 kWh = x : 0.1 kWh

And solving for x, we find

$x=\frac{\$0.18 \cdot 0.1kWh}{1 kWh}=\$ 0.018$

4 0

3 years ago

You wish to buy a motor that will be used to lift a30-kg bundle of shingles from the ground to the roof of a house. The shingles

hodyreva [135]

Answer:

the minimum value of torque is 101.7 N-m.

Explanation:

Given that,

Mass of bundle of shingles, m = 30 kg

Upward acceleration of the shingles,

The radius of the motor of the pulley, r = 0.3 m

Let T is the tension acting on the shingles when it is lifted up. It can be calculated as :

T-mg=ma

T=m(g+a)

$T=10\times (9.8+1.5)\\T = 113 N$

Let $\tau$ is the minimum torque that the motor must be able to provide. It is given by :

$\tau=r\times T\tau=0.3\times 339\tau=101.7\ N-m$

the minimum value of torque is $101.7 N-m.$

6 0

3 years ago

Which technique is the most useful for measuring the distance to a galaxy located 10 million light-years away?

devlian [24]

The technique which is the most useful for measuring the distance to a galaxy located 10 million light-years away is Cepheids

A Cepheid variable is a particular kind of star that pulses radially, varying in diameter and temperature while causing changes in brightness with a clearly discernible steady time and amplitude.

A light-year is defined as the total amount of distance covered by light in a year. It is usually a unit to measure very large distances which usually concerns the Outerspace

A galaxy is a system made up of stars, stellar debris, interstellar gas, dust, and other matter that is gravitationally bound. The name "galaxy" is derived from the Greek word "galaxies," which is an allusion to the Milky Way and literally means "milky."

Learn more about Cepheids here

brainly.com/question/15182908

#SPJ4

7 0

2 years ago

An experimentalist fires a beam of electrons, creating a visible path in the air that can be measured. The beam is fired along a

gtnhenbr [62]

Answer:

Velocity of the electron in the beam.

Radius of the circulating electrons due to the magnetic field.

Explanation:

We have a Mathematical expression for the force on a moving charge in a magnetic field as: