1. how does an inclined plane help make it easier to do work on a heavy object?
A. it reduces the amount of friction on the object
B. it reduces the total amount of work needed by increasing the force
C. it reduces the amount of distance needed by increasing the force
D. It reduces the amount of force needed by increasing the distance
2. a student is sledding down a hill traveling 6 m/s. The sled can fit up to three students. which change would increase the kinetic energy of the sled the most?
A. decrease the speed of the sled to 3 m/s
B. Increase the speed of the sled to 12 m/s
C. Add two more students to the sled traveling 6 m/s
D. Add one more student to the sled and decrease the speed to 3 m/s
3. Which scenario describes increasing gravitational potential energy?
A. compressing a spring
B. skiing down a ski slope
C. going up in an elevator
D. applying the brakes in a car
4. A student is playing a game on her cell phone and the battery level is decreasing. Which energy transformation is taking place
A. Electrical energy to chemical and thermal energy
B. Chemical energy to electromagnetic and sound energy
C. chemical energy to gravitational potential energy and thermal energy
D. electrical energy to electromagnetic and gravitational potential energy
5. A student is heating up a frying pan on the stove. The student is wearing a glove to protect his hand from burning. Which statement about the properties of the frying pan and the glove are correct?
A. The frying pan and the glove should both be good insulators
B. The frying pan and the glove should both be good conductors
C. The frying pan should be a good insulator and the glove should be a good conductor
D. The frying pan should be a good conductor and the glove should be a good insulator
6. Two fruit flies with long wings mated and had offspring. Some offspring had long wings and some had short wings. The allele for short wing size is
A. Recessive because neither parent had short wings
B. Dominant because neither parent had short wings
C. Recessive because the trait was seen in the parents
D. Dominant because the trait was seen in the parents
7. White wool in sheep is a dominant trait and black wool is a recessive trait. Two heterozyous sheep were bred and had 3 offspring with black wool and 2 with white wool. why were there more sheep with black wool than white wool?
A. The alleles are inherited based on probability
B. The sheep were artificially selected for black wool
C. There were mutations in the genes during reproduction
D. Heterozgous combinations produce mostly recessive traits
8. A plant with red flowers is crossed with a plant with white flowers. They produce one red-flowered plant, one white flowered plant, and two plants with red and white flowers. This is an example of
A. Recessive inheritance
B. Dominant inheritance
C. Codominant inheritance
D. incomplete dominant inheritance
9. Which statement correctly describes advantages of asexual and sexual reproduction?
A. Asexual reproduction increases the genetic diversity in a species. Sexual reproduction allows an organism to select a mate.
B. Asexual reproduction increases the lifespan of individuals. Sexual reproduction allows organisms to reproduce quickly.
C. Asexual reproduction allows an organism to reproduce quickly. Sexual reproduction increases the genetic diversity in a species.
D. Asexual reproduction allows an organism to reproduce in large numbers. Sexual reproduction allows and organisms to make exact copies.
10. Which of the following correctly describes how proteins are formed
A. DNA is transcribed to mRNA which is then translated to tRNA
B. DNA is transcribed to tRNA which is then translated to mRNA
C. DNA is translated to tRNA which is then transcribed to mRNA
D. DNA is translated to mRNA which is then transcribed to tRNA
Does anyone have the answers? I need it to check my work
1. The correct answer is D. It reduces the amount of force needed by increasing the distance. An inclined plane allows you to exert force over a longer distance, which reduces the amount of force required to lift or move the heavy object.
2. The correct answer is B. Increase the speed of the sled to 12 m/s. Kinetic energy is directly proportional to the square of the velocity, so increasing the speed of the sled will have the greatest impact on its kinetic energy.
3. The correct answer is C. Going up in an elevator. Gravitational potential energy is directly related to the height or elevation of an object. Going up in an elevator increases the height and therefore the gravitational potential energy.
4. The correct answer is A. Electrical energy to chemical and thermal energy. The battery in the cell phone converts electrical energy into chemical energy for storage. When the phone is being used and the battery level is decreasing, the chemical energy is converted into thermal energy (heat) as well as electromagnetic energy (for running the phone).
5. The correct answer is D. The frying pan should be a good conductor and the glove should be a good insulator. A frying pan needs to be a good conductor of heat to evenly distribute the heat for cooking. The glove, on the other hand, needs to be a good insulator to protect the hand from burning.
6. The correct answer is C. Recessive because the trait was seen in the parents. If the parents had short wings, it means they carried the recessive allele for short wing size, which can be passed on to their offspring.
7. The correct answer is A. The alleles are inherited based on probability. Inheritance of traits follows Mendelian genetics, where the combination of alleles from both parents determines the phenotype. The presence of more sheep with black wool suggests that the black wool allele is more common or has a higher probability of being inherited.
8. The correct answer is C. Codominant inheritance. Codominance occurs when both alleles for a gene are expressed in the phenotype. In this case, the plants with red and white flowers are exhibiting codominance, where both colors are present in the flowers.
9. The correct answer is C. Asexual reproduction allows an organism to reproduce quickly. Sexual reproduction increases the genetic diversity in a species. Asexual reproduction generates offspring that are genetically identical to the parent, allowing for rapid reproduction. Sexual reproduction, on the other hand, involves the combining of genetic material from two parents, resulting in offspring with new genetic combinations and increased genetic diversity.
10. The correct answer is A. DNA is transcribed to mRNA which is then translated to tRNA. Protein synthesis involves two major steps: transcription and translation. In transcription, the DNA sequence is transcribed into mRNA (messenger RNA), and in translation, the mRNA sequence is translated into a sequence of amino acids by the tRNA (transfer RNA).