why do some things float and others sink

why do some things float and others sink

Students are given a plastic tub filled with a variety of materialsвwood of different sizes and shapes, a pencil, a marble, a styrofoam ball, a cork, a plastic spoon, a rubber band, a penny, a toothpick, a paper clip, and whatever else is handy. They are asked to predict which objects will float and which will sink when placed under the level of the water and let go. Students perform the experiment and compare the results to their predictions. They discuss why they thought certain objects would sink/float. The class brainstorms a list of properties of the different objects that may affect whether the object floats or sinks. Using the objects they already have, students do simple tests to rule out some of the properties (such as color, shape, etc). In the end, it should be apparent that

 why muslim prayer 5 times a day

why muslim prayer 5 times a day

According to Prophet Muhammad, the only thing that separates Muslims from non-believers is the prayers. It is the second pillar of Islam after the declaration of faith. Islam is based on five pillars and if one is missing then the whole building collapses. There is no other religion which instructs its followers to pray five times a day therefore Salah is the identity of Muslims. Muslims are ordered to pray five times a day at specific times; before sunrise, midafternoon, late afternoon, sunset and at night. Both the Quran and the Hadith of the Prophet strongly emphasizes the vitality of the five daily prayers in Islam. Salah is a way of totally submitting to the wills of Allah and showing gratitude to him because as Muslims, we donБt bow before anyone but Allah the Almighty. Allah the

 why do sperm cells have many mitochondria

why do sperm cells have many mitochondria

Eggs (ova) and sperm have half the number of chromosome One of the rod shaped bodies found in the nucleus of cells that contain genetic information (DNA). of normal body cells. They are called haploid cells rather than diploid An organism or cell that contains two copies of each chromosome. cells. A single egg cell is called an ovum. Collectively, eggs and sperm are called gametes or sex cells. When fertilisation occurs, an egg (ovum) and a sperm fuse to form a zygote. Eggs and sperm have several important adaptations linked to their structure. An egg cell (ovum) is one of the largest cells in the human body and can just be seen without using a microscope. Each egg cell has a haploid nucleus - containing only half the number of chromosomes of a normal cell nucleus. ...

 why do they say god bless you

why do they say god bless you

Please stop acknowledging my bodily functions. Bless you is a phrase so reflexively spoken upon hearing a sneeze that many of us forgot or don't even know where it came from. It has obvious religious connotations but they're archaic and no longer make any sense in our modern-day world. You don't protect your friend from the devil when she coughs so please, let her sneeze in peace. Here are five reasons why bless you has to go. 1. The plague is no longer a thing. And thank God, sure, that we no longer live in a world where the pope (Gregory I in 600 AD, to be exact) is imposing on us the responsibility to bless one another from dying from the bubonic plague. 2. ...

 why do the steelers not have cheerleaders

why do the steelers not have cheerleaders

The Pittsburgh Steelerettes were the first squad in the, serving as the cheerleaders for the during the 1960s. The squad eventually disbanded, and the Steelers to this day are among the few NFL teams that do not have cheerleaders. From their beginning in until the squad's demise in, all members of the Steelerettes were full-time students at in,. Robert Morris was a small Junior College without a football team who had unofficially adopted the Steelers as "their team". An administrator at the College, William Day, also served as the entertainment coordinator for the Steelers. It was his idea to hold tryouts at the College and select a group of young coeds to perform on the field, in hopes of improving lackluster ticket sales to Steelers games. At tryouts, candidates were evaluated on

 why is my curly hair so dry

why is my curly hair so dry

1. Cover the sink with before detangling your hair. Never clog the sink again. 2. When detangling your hair, use your fingers or a instead of a brush to prevent breakage and preserve the shape of your curls. 3. When combing or brushing your hair, gradually move upward instead of starting at the roots. It's much easier to comb through knots at the ends first. 4. Before stepping into the shower, apply a to your hair, tuck it into a, and wash your body before washing your hair as normal. The steam from the shower will help lock in moisture. 5. Mix a small amount of with a lot of conditioner to make your own cleansing conditioner, which gently washes while it deeply moisturizes. Apply the mixture to the crown of your head and thoroughly massage it into your scalp, focusing on just the roots

 why is weathering important to the process of erosion

why is weathering important to the process of erosion

A natural process affected by human activities, erosion causes soil or layers of soil to be moved or worn away. Erosion is a potential environmental issue because it usually washes away nutrient-rich topsoil from lands. This can prevent future generations of plants from growing in eroded areas. Because of this, erosion is considered one of the most influential natural forces in nature. Erosion occurs mainly because of water. Increased amounts of water tend to overflow onto land. As the water increases, the soil becomes over-saturated with water. According to a Virginia Tech environmental professor, most of the soil particles end up flowing with the water sources, such as lakes, rivers or the ocean. The end result is high amounts of soil particles in water sources and a lack of soil, or

 why do they let you fight in hockey

why do they let you fight in hockey

Presently in the, teams generally do not carry more than one player whose primary role is that of an enforcer. Enforcers can play either or defense, although they are most frequently used as on the 4th forward checking. Prized for their aggression, size, checking ability, and fists, enforcers are typically less gifted at skill areas of the game than their teammates. Enforcers are typically among the lowest scoring players on the team and receive a smaller share of ice time. They are also not highly paid compared to other players, and tend to move from team to team. Enforcers are nevertheless often popular on their teams. "The enforcer, sometimes mocked as a goon or as a tough guy, may be hockey's favorite archetype," wrote of. "Enforcers are seen as working-class superheroesunderstated

 why do smells give me a headache

why do smells give me a headache

Spritzing on a new scent at the fragrance counter can really be a game of chance. You might fall in love with the fragrance and walk out with an exciting new bottle to add to your vanity or you could be running out of the store in a dizzy mess. While some thrive at the fragrance counter, taking the chance to sniff and spritz as many testers as possible, others get easily overwhelmed by scents. You might experience headaches, nausea, and dizziness from sniffing different fragrances and perfumes, but that doesn't necessarily mean you want to stop wearing a perfume completely after all, that final spritz of perfume is the cherry on top of an amazing look. We spoke with William Yin, founder of fragrance subscription service Scent Trunk and Sarah McCartney, a perfumer at who works there, to

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